Prashanth MH | National Institute of Technology Karnataka,Surathkal (original) (raw)

Papers by Prashanth MH

11th International Conference on Fracture Mechanics of Concrete and Concrete Structures , 2023

The mixed mode crack growth in reinforced concrete is studied for effects of size and reinforceme... more The mixed mode crack growth in reinforced concrete is studied for effects of size and reinforcement ratios. The beam specimens were reinforced with a single longitudinal bar and no shear reinforcement was provided. In the experimental work, three reinforcing bar diameters i.e. 8mm, 10mm and 12mm were used for the small, medium and large beam specimens respectively. The notch was provided at the quarter span, as it is the region prone for mixed mode crack initiation and propagation. The data from load, CMOD, displacement and strain in steel were useful to understand the behaviour of reinforced concrete in opening and mixed mode. It can be concluded that, the larger beams are more brittle compared to the smaller ones and this observation is consistent with the size effect law for reinforced concrete. It is observed that, the final failure occurs due to propagation of the flexural crack at mid-span and the diagonal tension crack resulting from inadequate shear capacity at the quarter-point position of the beam. This implies that a shear-tension crack develops suddenly leading to a more brittle kind of failure than a pure flexural crack in tension.

Proceedings of 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures , 2019

Reinforced concrete structures deteriorate under service conditions due to various factors includ... more Reinforced concrete structures deteriorate under service conditions due to various factors including loading, environment etc. The failure associated with these structures could be either due to flexure, shear, torsion or a combination of these. Understanding the brittle failure due to shear is of practical importance due to increased use of beams having large depths. Hence, in this study, the acoustic emission (AE) technique is used for monitoring the behaviour of reinforced concrete specimens which fail by shear. The AE data of events, absolute energy and time are analysed to understand the fracture process and energy released. It is seen that, the events of higher energy are located in the region where actual failure took place by the formation of diagonal tension crack due to shear. Thus, the critical failure path in RC beams can be identified through the events of higher energy.

Proceedings of 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures, 2016

This paper presents an experimental study on mixed crack propagation in reinforced concrete beam.... more This paper presents an experimental study on mixed crack propagation in reinforced concrete beam. The specimen was reinforced with single longitudinal bar of diameter 8mm (percent-age=0.66%) with no stirrups. The notch is provided at the quarter span, as it is the region prone for mixed mode crack initiation and propagation. The specimen is tested in three point bending under displacement/stroke control in the closed loop servo controlled hydraulic testing machine. The results of load, displacement, CMOD and strain in the steel are acquired in the data acquisition system. The results were analysed and related failure mechanisms observed in reinforced concrete are cracking, yielding of steel, shear, slippage and de-bonding between steel and concrete. The acoustic emission technique is used for monitoring the crack growth in reinforced concrete beam using six AE-sensors mounted on the specimen. The acoustic emission events location is used to understand the cracking and fracture process in zone of tensile and shear cracking. The AE data of events, amplitude, absolute energy and time are analysed to understand cracking, energy released and fracture processes in opening and mixed modes and to compare them.

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures, 2016

Fatigue crack growth in plain concrete specimens subjected to constant amplitude cyclic loading i... more Fatigue crack growth in plain concrete specimens subjected to constant amplitude cyclic loading is studied. Acoustic Emission (AE) technique has been used to monitor the fatigue crack propagation. Three different sizes of geometrically similar beam specimens are prepared and are tested under three point bending (TPB) in a closed loop servo-controlled testing machine. The data such as load, displacement and CMOD from the testing of specimen for fatigue are acquired in a data acquisition systems and crack growth is continuously monitored using six AE sensors mounted on the specimen. The CMOD compliances at different cycles are measured from the load-CMOD curves and the equivalent fatigue crack lengths are determined using the compliance calibration curve obtained from FE analysis. AE parameters such as events, counts and absolute energy are used to analyze the crack growth.

International Conference on, “Green Highway Construction – A Sustainable Approach”

The structures which are to the end of their service life are increasing continuously with time. ... more The structures which are to the end of their service life are increasing continuously with time. Hence structures which have completed their service life need to be abandoned. This results in generation of huge amount of construction and demolition waste (C&D). The disposal of the construction and demolition waste is a major concern. Using them as a landfill would be one option, but recycling and reusing it is another option, so that waste generation is decreased, making the environment greener and sustainable. In the present experimental work, the C&D waste is processed to get a recycled coarse aggregate. Further, various proportions (0, 50%, 100%) of RCA is replaced with normal coarse aggregates. The mechanical properties of recycled concrete are studied and compared with normal concrete. From this study, it was observed that performance of recycled coarse aggregate concrete is same or marginally less when compared to that of normal aggregate concrete.

IOSR-Journal of Mechanical and Civil Engineering, 2014

This paper presents an experimental investigation on the strength and stiffness behavior of reinf... more This paper presents an experimental investigation on the strength and stiffness behavior of reinforced concrete (RC) frame with and without infills. The types of materials used for the infills are brick masonry and brick masonry with ferro-cement mesh bands. The behavior of brick masonry infills with central opening is also studied. The frame specimens of size 830 mm X 110 mm X 170 mm, were cast with open bare frame (without infills), brick masonry infills, brick masonry infills with the ferro-cement mesh bands and brick masonry infills with the central opening. In the present work, the portal frame with lateral loading has been simulated and modified to vertical diagonally loaded frame due to practical testing limitation for the lateral load. The test results indicate that the introduction of infill increases the first crack load and ultimate load markedly. The stiffness of infilled frame has been found to be approximately 2.0 times greater than that the open bare frame (without infills). Amongst different infills tested, reinforced concrete brick masonry infilled frame with ferrocement mesh bands provided along the bed joints was found to give better performance with regard to strength and stiffness.

International Journal of Civil and Structural Engineering, 2013

Structural damages and economic losses caused by natural disaster like earthquakes concerns about... more Structural damages and economic losses caused by natural disaster like earthquakes concerns about structural safety and led to the proposal of various strategies to improve the dynamic performance of bridges. The steel truss railway bridge experiences dynamic vibrations due to train loading and earthquake loading. This paper presents the application of passive control device such as Tuned Mass Dampers (TMD) to steel truss railway bridge, which is used to reduce the vibration of bridge structures. The steel truss railway bridge is subjected to live load such as Heavy Mineral Loading (HMT) i.e. train loading and earthquake loading. The bridge structure is modelled using commercially available finite element software SAP 2000.The response parameters such as displacement, accelerations are observed for steel truss Railway Bridge with and without TMD for HMT loading and earthquake loading. The reduction in the displacement and acceleration are observed for bridge structure with TMD when compared to bridge structure without TMD.

First Annual Conference on Innovations and Developments in Civil Engineering, ACIDIC-2014, 2014

In the present work, the application of tuned mass dampers (TMD) to the vibration of steel bow-st... more In the present work, the application of tuned mass dampers (TMD) to the vibration of steel bow-string arch bridges which are susceptible to seismic forces is studied. A steel bow-string arch bridge having span of 50m is considered for analysis and the bridge was modeled using commercial FEM software, SAP 2000. Live load analysis is done for IRC loading. Working of TMD, equations involved in optimizing the parameters of TMD are discussed. Optimization of TMD parameters was done using Den Hartog's method. Modal analysis and time-history analysis was carried out on the steel bow-string arch bridge for Chamba earthquake function. Comparison of responses of the bridge without and with TMD are presented and found that TMD is effective in reducing the vibrations induced excitations caused by seismic force.

First Annual Conference on Innovations and Developments in Civil Engineering, ACIDIC-2014, 2014

Normal concrete mixes with M20, M30, M40 grades and M40 grade Self Compacting Concrete (SCC) mixe... more Normal concrete mixes with M20, M30, M40 grades and M40 grade Self Compacting Concrete (SCC) mixes were cast and studied for effect of different curing methods (water ponding, application of wax based curing compound immediately after demoulding and after two days of water curing) on compressive strength and chloride ion permeability properties. It is observed that for all mixes, water ponding method gives the higher strength and lower chloride ion penetrability than with curing compound; this effect is more in SCC mixes compared to normal concrete mixes.

Jounal of Civil Engineering Research, 2013

In the present work a cable stayed bridge of fan type arrangement is analysed for static and dyna... more In the present work a cable stayed bridge of fan type arrangement is analysed for static and dynamic load. The analysis is done with all the cables under normal condition, d ifferent percentage of corrosion of one cable and the failure of one cable due to excessive corrosion. The analysis is performed using fin ite element method software MIDAS Civ il. The software is validated with simple bridge model. The bridge is analysed for moving load case as per the IRC 6-2000 and also for earthquake load (Time History of El Centro) and for different load co mbinations. The effect on axial forces in cab le, deflection of deck, natural frequency, mode shape of the structure and earthquake response of the Cable Stayed bridge is studied.

International Journal of Earth Sciences & Engineering, 2011

Fiber Reinforced Concrete is a relatively new construction developed through extensive research a... more Fiber Reinforced Concrete is a relatively new construction developed through extensive research and development work during last four decades. It has already found a wide range of practical applications and has proved as a reliable construction material having superior performance characteristics compared to conventional RCC. Incorporation of fibers in to concrete has been found to improve several of its properties such as impact, cracking resistance, ductility and fatigue resistance. An experimental study envisages comparing the strength and ductility characteristics achieved by synthetic fibre dispersed throughout and also in discrete zones vis-à-vis conventional RC frames.

ISET Golden Jubilee Symposium, Indian Society of Earthquake Technology, IIT Roorkee, 2012

Reinforced concrete multi-storied buildings are very complex to model as structural systems for a... more Reinforced concrete multi-storied buildings are very complex to model as structural systems for analysis. The current version of the IS: 1893-2002 requires that practically all multistoried buildings be analyzed as three-dimensional systems. This is due to the fact that the buildings have generally irregularities in plan or elevation or in both and later that may have a detrimental influence and effectiveness on seismic performance itself. The paper discusses the performance evaluation of RC (Reinforced Concrete) Buildings with vertical irregularity. The study as a whole makes an effort to evaluate the effect of vertical irregularity on RC buildings, in terms of dynamic characteristics and identifies the influencing parameters which can regulate the effect on Base Shear, Time Period, Story Displacement & Story Drift. Also, the analysis has been carried out for various zones of India and soil conditions taken in to consideration.

International Conference on Earthquake Analysis & Design of Structures, EQADS 2011, 2011

Reinforced concrete multi-storied buildings are very complex to model as structural systems for a... more Reinforced concrete multi-storied buildings are very complex to model as structural systems for analysis. The current version of the IS: 1893-2002 requires that practically all multistoried buildings be analyzed as three-dimensional systems. This is due to the fact that the buildings have generally irregularities in plan or elevation or in both. Some of the poor planning and construction practices of multistoried buildings in Peninsular India in particular, lead to irregularities in plan and elevation of the buildings. This paper discusses the performance evaluation of an irregular RC Building with mass irregularity. The present study makes an effort to evaluate the effect of heavy mass in each floor of G+9 building, to study the various parameters-Base Shear, Time Period, Story Displacement & Story drifts. The study as a whole identifies the influencing parameters which can regulate the effect of mass irregularity on, time period, base shear, drifts and displacement of building frames.

International journal of advanced structures and geotechnical engineering, 2013

The paper discusses the effects of using different pozzolonic materials as a partial cement repla... more The paper discusses the effects of using different pozzolonic materials as a partial cement replacement material in mortar mixes. An experimental study of mortar made with Ordinary Portland cement (OPC) and 12% of OPC, replaced by different pozzolanic materials such as Fly Ash, Rice Husk ash, Silica Fume, Calcined Clay (Grog) and Slag (GGBS) were tested for the strength and durability properties, to determine the effect of these materials on mortar properties and was compared to control mortar mix. Mortar specimens were tested for compressive strength at age of 3, 7 and 28 days and flexural strength at age of 28 days. To investigate the mortar for its durability, the specimens after initial curing of 28 days were immersed in fresh water with solutions of 10% sodium sulfate (Na2SO4) and 10% magnesium sulfate (MgSO4) for another period of 3 months. Through this period, the specimens were tested for compressive strength at 60, 90 and 120 days to evaluate its durability.

NITK Research Bulletin, 2012

This is an experimental investigation focused on the study of the effect of addition of helix fib... more This is an experimental investigation focused on the study of the effect of addition of helix fibers in plain concrete to evaluate the compressive strength, tensile strength and the modulus of elasticity when compared to normal concrete. Concrete Mix of M 25 grade was used and the mix proportions were obtained. The main variable in this study are the different dosages of helix fibers i.e. 0 (Normal concrete), 10, 15 and 25 kg/m 3. The compressive strength and the split tensile strength values for different dosages of helix fibers were plotted for 7, 14 and 28 days. The stress-strain curve was plotted for different dosages of helix fibers at 28 days to determine the modulus of elasticity. The results indicated that the addition of helix fibers in plain concrete increased the compressive strength, tensile strength, modulus of elasticity and the ductility of concrete when compared to normal concrete.

International Journal of Earth Sciences & Engineering, 2012

Retrofitting concrete structures with Carbon Fiber Reinforced Polymer (CFRP) has grown widely in ... more Retrofitting concrete structures with Carbon Fiber Reinforced Polymer (CFRP) has grown widely in most parts of the world today. The main reason for the wide spread application of FRP is that it is possible to obtain an effective strengthening with a relative small work effort. Furthermore it is possible to carry out strengthening work without changing the current appearance or dimension of the structure. To strengthen and increase the ductility of the structure, CFRP has become an innovative material in to the field of structural strengthening and rehabilitation. In the present experimental investigation, RC beams were preloaded up to 0 to 50 % of the ultimate capacity and were applied with CFRP sheets at the soffit of the beams were compared with control beam. The Load vs deflection, and crack mechanism are studied. The use of CFRP sheets in the soffit of the beam has resulted in enhanced strength and ductility.

International Journal of Earth Sciences & Engineering, 2012

Reinforced Concrete frames are the main load resisting systems used in practice all over the worl... more Reinforced Concrete frames are the main load resisting systems used in practice all over the world. These frames will be subjected to sway, due to lateral loading most of the times by either earthquake or wind. Ductility and energy dissipation capacity of the frame are the key parameters for better performance under the action of the sway loading. Retrofitting using the new generation material such as carbon fiber reinforced plastic sheets (CFRP) shows much enhancement in these properties of laterally loaded frames. Frames subjected to lateral loading introduce collapse mechanism due to the formation of the plastic hinges at critical hinge locations. An experimental investigation of partially and fully CFRP wrapped reinforced concrete (RC) frames when compared to conventional(bare) frame has been carried out, to bring out the importance of critical engineered locations to be wrapped.

International Journal of Earth Sciences & Engineering, 2012

Interlocking concrete block pavers (ICBP) has been extensively used in many of the countries due ... more Interlocking concrete block pavers (ICBP) has been extensively used in many of the countries due to concern with durability. They are utilized in a variety of commercial, municipal and industrial applications. The superior engineering properties, low maintenance, ease of placement and removal, aesthetic appeal and immediate availability are the primary reasons for choosing concrete block pavement over other paving surfaces. ICBP are colored using iron oxide pigments. The present investigation details the properties of ICBPs mixed with iron ore tailings as a partial replacement for cement. The paper discusses the experimental studies on strength characteristics and water absorption of iron ore tailings based concrete paver blocks by considering actual area and plan area and results has been compared with that of conventional concrete paver blocks. Introduction:

International Journal of Earth Science & Engineering, 2010

The paper presents the performance enhancement of RC frames using welded wire fabrics to appraise... more The paper presents the performance enhancement of RC frames using welded wire fabrics to appraise beneficial effects of welded wire fabrics as lateral reinforcement in Reinforced Concrete elements. The RC frames subjected to lateral loading have been simulated to rhombus frame with vertical loading. The experimental investigation has been
done on rhombus frame with vertical loading. Experimental program involved details of test specimens, test set-up and instrumentation. Comparison of conventional bare frames has been done for frame with welded wire fabrics as lateral reinforcement at discrete zone and
frame with welded wire fabrics as lateral reinforcement throughout the length for the same volume fraction. Results of Experimental investigation have been reported from which the discussions and conclusions had been drawn.

11th International Conference on Fracture Mechanics of Concrete and Concrete Structures , 2023

The mixed mode crack growth in reinforced concrete is studied for effects of size and reinforceme... more The mixed mode crack growth in reinforced concrete is studied for effects of size and reinforcement ratios. The beam specimens were reinforced with a single longitudinal bar and no shear reinforcement was provided. In the experimental work, three reinforcing bar diameters i.e. 8mm, 10mm and 12mm were used for the small, medium and large beam specimens respectively. The notch was provided at the quarter span, as it is the region prone for mixed mode crack initiation and propagation. The data from load, CMOD, displacement and strain in steel were useful to understand the behaviour of reinforced concrete in opening and mixed mode. It can be concluded that, the larger beams are more brittle compared to the smaller ones and this observation is consistent with the size effect law for reinforced concrete. It is observed that, the final failure occurs due to propagation of the flexural crack at mid-span and the diagonal tension crack resulting from inadequate shear capacity at the quarter-point position of the beam. This implies that a shear-tension crack develops suddenly leading to a more brittle kind of failure than a pure flexural crack in tension.

Proceedings of 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures , 2019

Reinforced concrete structures deteriorate under service conditions due to various factors includ... more Reinforced concrete structures deteriorate under service conditions due to various factors including loading, environment etc. The failure associated with these structures could be either due to flexure, shear, torsion or a combination of these. Understanding the brittle failure due to shear is of practical importance due to increased use of beams having large depths. Hence, in this study, the acoustic emission (AE) technique is used for monitoring the behaviour of reinforced concrete specimens which fail by shear. The AE data of events, absolute energy and time are analysed to understand the fracture process and energy released. It is seen that, the events of higher energy are located in the region where actual failure took place by the formation of diagonal tension crack due to shear. Thus, the critical failure path in RC beams can be identified through the events of higher energy.

Proceedings of 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures, 2016

This paper presents an experimental study on mixed crack propagation in reinforced concrete beam.... more This paper presents an experimental study on mixed crack propagation in reinforced concrete beam. The specimen was reinforced with single longitudinal bar of diameter 8mm (percent-age=0.66%) with no stirrups. The notch is provided at the quarter span, as it is the region prone for mixed mode crack initiation and propagation. The specimen is tested in three point bending under displacement/stroke control in the closed loop servo controlled hydraulic testing machine. The results of load, displacement, CMOD and strain in the steel are acquired in the data acquisition system. The results were analysed and related failure mechanisms observed in reinforced concrete are cracking, yielding of steel, shear, slippage and de-bonding between steel and concrete. The acoustic emission technique is used for monitoring the crack growth in reinforced concrete beam using six AE-sensors mounted on the specimen. The acoustic emission events location is used to understand the cracking and fracture process in zone of tensile and shear cracking. The AE data of events, amplitude, absolute energy and time are analysed to understand cracking, energy released and fracture processes in opening and mixed modes and to compare them.

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures, 2016

Fatigue crack growth in plain concrete specimens subjected to constant amplitude cyclic loading i... more Fatigue crack growth in plain concrete specimens subjected to constant amplitude cyclic loading is studied. Acoustic Emission (AE) technique has been used to monitor the fatigue crack propagation. Three different sizes of geometrically similar beam specimens are prepared and are tested under three point bending (TPB) in a closed loop servo-controlled testing machine. The data such as load, displacement and CMOD from the testing of specimen for fatigue are acquired in a data acquisition systems and crack growth is continuously monitored using six AE sensors mounted on the specimen. The CMOD compliances at different cycles are measured from the load-CMOD curves and the equivalent fatigue crack lengths are determined using the compliance calibration curve obtained from FE analysis. AE parameters such as events, counts and absolute energy are used to analyze the crack growth.

International Conference on, “Green Highway Construction – A Sustainable Approach”

The structures which are to the end of their service life are increasing continuously with time. ... more The structures which are to the end of their service life are increasing continuously with time. Hence structures which have completed their service life need to be abandoned. This results in generation of huge amount of construction and demolition waste (C&D). The disposal of the construction and demolition waste is a major concern. Using them as a landfill would be one option, but recycling and reusing it is another option, so that waste generation is decreased, making the environment greener and sustainable. In the present experimental work, the C&D waste is processed to get a recycled coarse aggregate. Further, various proportions (0, 50%, 100%) of RCA is replaced with normal coarse aggregates. The mechanical properties of recycled concrete are studied and compared with normal concrete. From this study, it was observed that performance of recycled coarse aggregate concrete is same or marginally less when compared to that of normal aggregate concrete.

IOSR-Journal of Mechanical and Civil Engineering, 2014

This paper presents an experimental investigation on the strength and stiffness behavior of reinf... more This paper presents an experimental investigation on the strength and stiffness behavior of reinforced concrete (RC) frame with and without infills. The types of materials used for the infills are brick masonry and brick masonry with ferro-cement mesh bands. The behavior of brick masonry infills with central opening is also studied. The frame specimens of size 830 mm X 110 mm X 170 mm, were cast with open bare frame (without infills), brick masonry infills, brick masonry infills with the ferro-cement mesh bands and brick masonry infills with the central opening. In the present work, the portal frame with lateral loading has been simulated and modified to vertical diagonally loaded frame due to practical testing limitation for the lateral load. The test results indicate that the introduction of infill increases the first crack load and ultimate load markedly. The stiffness of infilled frame has been found to be approximately 2.0 times greater than that the open bare frame (without infills). Amongst different infills tested, reinforced concrete brick masonry infilled frame with ferrocement mesh bands provided along the bed joints was found to give better performance with regard to strength and stiffness.

International Journal of Civil and Structural Engineering, 2013

Structural damages and economic losses caused by natural disaster like earthquakes concerns about... more Structural damages and economic losses caused by natural disaster like earthquakes concerns about structural safety and led to the proposal of various strategies to improve the dynamic performance of bridges. The steel truss railway bridge experiences dynamic vibrations due to train loading and earthquake loading. This paper presents the application of passive control device such as Tuned Mass Dampers (TMD) to steel truss railway bridge, which is used to reduce the vibration of bridge structures. The steel truss railway bridge is subjected to live load such as Heavy Mineral Loading (HMT) i.e. train loading and earthquake loading. The bridge structure is modelled using commercially available finite element software SAP 2000.The response parameters such as displacement, accelerations are observed for steel truss Railway Bridge with and without TMD for HMT loading and earthquake loading. The reduction in the displacement and acceleration are observed for bridge structure with TMD when compared to bridge structure without TMD.

First Annual Conference on Innovations and Developments in Civil Engineering, ACIDIC-2014, 2014

In the present work, the application of tuned mass dampers (TMD) to the vibration of steel bow-st... more In the present work, the application of tuned mass dampers (TMD) to the vibration of steel bow-string arch bridges which are susceptible to seismic forces is studied. A steel bow-string arch bridge having span of 50m is considered for analysis and the bridge was modeled using commercial FEM software, SAP 2000. Live load analysis is done for IRC loading. Working of TMD, equations involved in optimizing the parameters of TMD are discussed. Optimization of TMD parameters was done using Den Hartog's method. Modal analysis and time-history analysis was carried out on the steel bow-string arch bridge for Chamba earthquake function. Comparison of responses of the bridge without and with TMD are presented and found that TMD is effective in reducing the vibrations induced excitations caused by seismic force.

First Annual Conference on Innovations and Developments in Civil Engineering, ACIDIC-2014, 2014

Normal concrete mixes with M20, M30, M40 grades and M40 grade Self Compacting Concrete (SCC) mixe... more Normal concrete mixes with M20, M30, M40 grades and M40 grade Self Compacting Concrete (SCC) mixes were cast and studied for effect of different curing methods (water ponding, application of wax based curing compound immediately after demoulding and after two days of water curing) on compressive strength and chloride ion permeability properties. It is observed that for all mixes, water ponding method gives the higher strength and lower chloride ion penetrability than with curing compound; this effect is more in SCC mixes compared to normal concrete mixes.

Jounal of Civil Engineering Research, 2013

In the present work a cable stayed bridge of fan type arrangement is analysed for static and dyna... more In the present work a cable stayed bridge of fan type arrangement is analysed for static and dynamic load. The analysis is done with all the cables under normal condition, d ifferent percentage of corrosion of one cable and the failure of one cable due to excessive corrosion. The analysis is performed using fin ite element method software MIDAS Civ il. The software is validated with simple bridge model. The bridge is analysed for moving load case as per the IRC 6-2000 and also for earthquake load (Time History of El Centro) and for different load co mbinations. The effect on axial forces in cab le, deflection of deck, natural frequency, mode shape of the structure and earthquake response of the Cable Stayed bridge is studied.

International Journal of Earth Sciences & Engineering, 2011

Fiber Reinforced Concrete is a relatively new construction developed through extensive research a... more Fiber Reinforced Concrete is a relatively new construction developed through extensive research and development work during last four decades. It has already found a wide range of practical applications and has proved as a reliable construction material having superior performance characteristics compared to conventional RCC. Incorporation of fibers in to concrete has been found to improve several of its properties such as impact, cracking resistance, ductility and fatigue resistance. An experimental study envisages comparing the strength and ductility characteristics achieved by synthetic fibre dispersed throughout and also in discrete zones vis-à-vis conventional RC frames.

ISET Golden Jubilee Symposium, Indian Society of Earthquake Technology, IIT Roorkee, 2012

Reinforced concrete multi-storied buildings are very complex to model as structural systems for a... more Reinforced concrete multi-storied buildings are very complex to model as structural systems for analysis. The current version of the IS: 1893-2002 requires that practically all multistoried buildings be analyzed as three-dimensional systems. This is due to the fact that the buildings have generally irregularities in plan or elevation or in both and later that may have a detrimental influence and effectiveness on seismic performance itself. The paper discusses the performance evaluation of RC (Reinforced Concrete) Buildings with vertical irregularity. The study as a whole makes an effort to evaluate the effect of vertical irregularity on RC buildings, in terms of dynamic characteristics and identifies the influencing parameters which can regulate the effect on Base Shear, Time Period, Story Displacement & Story Drift. Also, the analysis has been carried out for various zones of India and soil conditions taken in to consideration.

International Conference on Earthquake Analysis & Design of Structures, EQADS 2011, 2011

Reinforced concrete multi-storied buildings are very complex to model as structural systems for a... more Reinforced concrete multi-storied buildings are very complex to model as structural systems for analysis. The current version of the IS: 1893-2002 requires that practically all multistoried buildings be analyzed as three-dimensional systems. This is due to the fact that the buildings have generally irregularities in plan or elevation or in both. Some of the poor planning and construction practices of multistoried buildings in Peninsular India in particular, lead to irregularities in plan and elevation of the buildings. This paper discusses the performance evaluation of an irregular RC Building with mass irregularity. The present study makes an effort to evaluate the effect of heavy mass in each floor of G+9 building, to study the various parameters-Base Shear, Time Period, Story Displacement & Story drifts. The study as a whole identifies the influencing parameters which can regulate the effect of mass irregularity on, time period, base shear, drifts and displacement of building frames.

International journal of advanced structures and geotechnical engineering, 2013

The paper discusses the effects of using different pozzolonic materials as a partial cement repla... more The paper discusses the effects of using different pozzolonic materials as a partial cement replacement material in mortar mixes. An experimental study of mortar made with Ordinary Portland cement (OPC) and 12% of OPC, replaced by different pozzolanic materials such as Fly Ash, Rice Husk ash, Silica Fume, Calcined Clay (Grog) and Slag (GGBS) were tested for the strength and durability properties, to determine the effect of these materials on mortar properties and was compared to control mortar mix. Mortar specimens were tested for compressive strength at age of 3, 7 and 28 days and flexural strength at age of 28 days. To investigate the mortar for its durability, the specimens after initial curing of 28 days were immersed in fresh water with solutions of 10% sodium sulfate (Na2SO4) and 10% magnesium sulfate (MgSO4) for another period of 3 months. Through this period, the specimens were tested for compressive strength at 60, 90 and 120 days to evaluate its durability.

NITK Research Bulletin, 2012

This is an experimental investigation focused on the study of the effect of addition of helix fib... more This is an experimental investigation focused on the study of the effect of addition of helix fibers in plain concrete to evaluate the compressive strength, tensile strength and the modulus of elasticity when compared to normal concrete. Concrete Mix of M 25 grade was used and the mix proportions were obtained. The main variable in this study are the different dosages of helix fibers i.e. 0 (Normal concrete), 10, 15 and 25 kg/m 3. The compressive strength and the split tensile strength values for different dosages of helix fibers were plotted for 7, 14 and 28 days. The stress-strain curve was plotted for different dosages of helix fibers at 28 days to determine the modulus of elasticity. The results indicated that the addition of helix fibers in plain concrete increased the compressive strength, tensile strength, modulus of elasticity and the ductility of concrete when compared to normal concrete.

International Journal of Earth Sciences & Engineering, 2012

Retrofitting concrete structures with Carbon Fiber Reinforced Polymer (CFRP) has grown widely in ... more Retrofitting concrete structures with Carbon Fiber Reinforced Polymer (CFRP) has grown widely in most parts of the world today. The main reason for the wide spread application of FRP is that it is possible to obtain an effective strengthening with a relative small work effort. Furthermore it is possible to carry out strengthening work without changing the current appearance or dimension of the structure. To strengthen and increase the ductility of the structure, CFRP has become an innovative material in to the field of structural strengthening and rehabilitation. In the present experimental investigation, RC beams were preloaded up to 0 to 50 % of the ultimate capacity and were applied with CFRP sheets at the soffit of the beams were compared with control beam. The Load vs deflection, and crack mechanism are studied. The use of CFRP sheets in the soffit of the beam has resulted in enhanced strength and ductility.

International Journal of Earth Sciences & Engineering, 2012

Reinforced Concrete frames are the main load resisting systems used in practice all over the worl... more Reinforced Concrete frames are the main load resisting systems used in practice all over the world. These frames will be subjected to sway, due to lateral loading most of the times by either earthquake or wind. Ductility and energy dissipation capacity of the frame are the key parameters for better performance under the action of the sway loading. Retrofitting using the new generation material such as carbon fiber reinforced plastic sheets (CFRP) shows much enhancement in these properties of laterally loaded frames. Frames subjected to lateral loading introduce collapse mechanism due to the formation of the plastic hinges at critical hinge locations. An experimental investigation of partially and fully CFRP wrapped reinforced concrete (RC) frames when compared to conventional(bare) frame has been carried out, to bring out the importance of critical engineered locations to be wrapped.

International Journal of Earth Sciences & Engineering, 2012

Interlocking concrete block pavers (ICBP) has been extensively used in many of the countries due ... more Interlocking concrete block pavers (ICBP) has been extensively used in many of the countries due to concern with durability. They are utilized in a variety of commercial, municipal and industrial applications. The superior engineering properties, low maintenance, ease of placement and removal, aesthetic appeal and immediate availability are the primary reasons for choosing concrete block pavement over other paving surfaces. ICBP are colored using iron oxide pigments. The present investigation details the properties of ICBPs mixed with iron ore tailings as a partial replacement for cement. The paper discusses the experimental studies on strength characteristics and water absorption of iron ore tailings based concrete paver blocks by considering actual area and plan area and results has been compared with that of conventional concrete paver blocks. Introduction:

International Journal of Earth Science & Engineering, 2010

The paper presents the performance enhancement of RC frames using welded wire fabrics to appraise... more The paper presents the performance enhancement of RC frames using welded wire fabrics to appraise beneficial effects of welded wire fabrics as lateral reinforcement in Reinforced Concrete elements. The RC frames subjected to lateral loading have been simulated to rhombus frame with vertical loading. The experimental investigation has been
done on rhombus frame with vertical loading. Experimental program involved details of test specimens, test set-up and instrumentation. Comparison of conventional bare frames has been done for frame with welded wire fabrics as lateral reinforcement at discrete zone and
frame with welded wire fabrics as lateral reinforcement throughout the length for the same volume fraction. Results of Experimental investigation have been reported from which the discussions and conclusions had been drawn.