Effect of loading rate on flexural behavior of concrete and reinforced concrete beams (original) (raw)
Related papers
IJERT-Experimental and Analytical Study on High Strength Concrete Beams under Flexure
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/experimental-and-analytical-study-on-high-strength-concrete-beams-under-flexure https://www.ijert.org/research/experimental-and-analytical-study-on-high-strength-concrete-beams-under-flexure-IJERTV4IS070154.pdf This paper presents the experimental program designed to study the fundamental characteristics of High Strength Concrete and flexural behaviour of simply supported high strength concrete beams under two point loading. The use of High Strength Concrete results in reduced dead loads in large span and taller structures. The current experimental study consists of casting 108 plain cement concrete specimenswhich includes cubes, beams and cylinders of grades M30, M60, M70 and M80. These specimens are tested for compressive strength and flexural strength over a period of 28 days, 56 days and 90 days. The results obtained from the tests on High Strength Concrete are compared with that of M30 grade plain cement concrete. The variables considered in this investigation were mainly the strength of concrete (60 MPa to 80 MPa) and the age of specimen. The specimens were analysed for ultimate load using the finite element software Robot Structure Analysis.
4th International Conference on Advances in Civil Engineering, 2018
The use of high strength concrete has become popular in construction work because of its improved strength and durability. High-strength concrete can be used as a substituting material over conventional concrete for structural members. This study describes the flexural behaviour of high strength reinforced concrete beam. The variation of flexural ductility with concrete compressive strength is quite complicated and thus sincerely reviewed in this paper. An experimental and numerical investigation of high strength reinforced concrete beam has been conducted in the present study. Four simply supported beams, having compressive strength of 27.50 MPa, 43.85 MPa, 54.05 MPa and 62.01 MPa, reinforced in top and bottom edges of the beam have been investigated in this study. The beams were tested under two-point loading to reveal their flexural behaviour. Load-deflection diagram and ductility index are the primary parameters that were considered in this study. The ultimate loads that obtained from the experimental results were found to be in good agreement with the numerical results. In addition, this study also compared the theoretical and experimental deflection at the mid-point of the beam. The cracking behaviour of all the beams and the crack width is also reviewed in this paper.
Experimental Study on Flexural Behavior of Reinforced Solid and Hollow Concrete Beams
The incessant uptick in the prices of steel reinforcement and cement steer to the dredging up ways to minimize the weight of concrete. This directly reflects on the total outlay for the construction project. In addition to this, anthropogenic CO 2 generated during cement and steel production leads to disturbance to landscape, dust and noise and other significant environmental problems. In reinforced concrete beams, strength of concrete lying in and near neutral axis is not fully utilized and hence this concrete can be supplanted with any light weight material. The idea of providing hollow section to the beam by incorporating PVC pipe in order to reduce the weight of the structure is one of the solutions for light weight beam structure. To check the suitability of such beam structures, an experimental testing was conducted to identify the flexural strength, deflection profile and crack pattern of the solid and hollow beam samples. For this, 6 beams each with dimension (200mm*300*2300) mm were taken with 2 beam samples being solid whereas remaining beams with longitudinal circular hollow section below neutral axis at calculated depth.M30 Grade of concrete was used. The beam samples were finally tested under gradually increasing two points loading and Linear Variable Displacement Transducer (LVDT) was used to measure the deflection produced.
ABSTARCT Through experimental testing, of series of concrete beams, the author wanted to obtain the tension values in the reinforcement and concrete under the simultaneous load; the occurrence of first cracks and monitoring of their development until the break of the beam and the measured values compared to the calculated ones with the purpose of more realistic analysis and unprovement of the existing theory for calculating the reinforced concrete constructions. Aim: The contribution , although slight, to the theory of the constructions calculation made of the reinforced concrete to be economically payable.
Flexural behaviour of High-performance concrete beams under Cyclic loading conditions
Journal of Engineering Research, 2022
Flexural behaviour of high-performance concrete (HPC) was affected by various parameters and plays a vital role in the strength of concrete. Present study aims in deciphering the role of cyclic loading on HPC reinforced with steel fibers. The study was carried out by casting of beams with hooked end steel fiber reinforced concrete with various grades (M60, M80, M100) and with admixtures (GGBS and Silica fume). Cast beams were studied for compressive strength, tensile strength, and flexural strength under cyclic loading. The study shows that there was a significant increase in compressive strength of HPC mixed with 1.0% of steel fiber. Flexural strength was found to be comparatively higher (upto 15% for all grades) for 1.25% steel fiber mixed HPC. Direct tensile strength is found to be higher than split tensile strength. Addition of steel fiber in HPC beam under cyclic loading, resulting in delayed or late development of cracks with decreased crack size.
Flexural Behaviour of Reinforced High Performance Concrete Beams Subjected to Bending
This paper presents the findings of the comprehensive experimental investigation on the use of industrial by-products like silica fume, bottom ash and steel slag aggregate for making reinforced high performance concrete beams for enhancing the flexural strength. Based on the encouraging results of the preliminary experimental work conducted by the authors, a comprehensive experimental investigation was carried out by testing ten numbers of RC beams with varying mix ratio of industrial by-products in order to further explore the viability of this technique. Data presented include the parameters such as load-deflection behaviour, moment-curvature relationship, ductility and energy absorption capacity. A reinforced high performance concrete beam proves to be effective at controlling cracks and exhibits ductility with a ductility ratio. The investigation revealed that the flexural behaviour of reinforced high performance concrete beams was comparable to that of control beams. The results of this study provide valuable data that can be used in further studies on the development of computational models of the deflection and flexural of HPC.
Comparative Study of Deflection Behavior of RCC and Pre-stressed Concrete Beams
International Journal for Research in Applied Science and Engineering Technology, 2019
Serviceability of a structure is generally defined as the clients' acceptance for continuous use of the structure for its lifetime under given loading condition without fear or any inhabitation. In reinforced concrete or prestressed concrete structures, cracking and deflection under service loads define the confident use of the structure at a given point of time. The deflections of structures are important for ensuring that the designed structure is not excessively flexible. The large deformations in the structures can cause damage or cracking of non-structural elements. Increased use of high strength concrete with reinforcing bars and prestressed reinforcement, coupled with more precise computer-aided limit state serviceability designs, has resulted in lighter and more material-efficient structural elements and systems. This in turn has necessitated better control of short-term and long term behavior of concrete structures at service loads. In this study deflection behavior of R.C.C and prestressed concrete beams is studied through computer software STAAD.Pro and PROKON.The analysis is done for beams spanning 15m with variable spacing of 4m, 5m and 6m for R.C.C and prestressed concrete beams. Then the same model is analyzed with the consideration of one secondary beam at the center of primary beam and then two equally spaced secondary beams. Finally, one and two floating columns are placed over the primary beams with and without secondary so as to check the deflection behavior. All the values of deflection are compared with the permissible values as per Indian Standard code. The aim is to compare the results with the permissible values and also to determine the percentage change in deflection for similar conditions of RCC and prestressed concrete beams.
Experimental Study on Behavior of Reinforced Concrete Beam Subjected to Cyclic Loading
2017
Experimental investigations that have been conducted by a number of researchers have shown that the confinement of concrete using an appropriate arrangement of transverse reinforcement results in a significant increase in both the strength and ductility of confined concrete. The increase of strength and ductility of concrete due to confinement have a significant impact on the load-bearing capacity and ductility of reinforced concrete elements subjected to bending. The experimental testing includes twelve beams reinforced with same longitudinal reinforcement and different transverse confining reinforcement. The aim of this research was to investigate the effects of confinement on strength and ductility of the beam under cyclic loading. The experiments resulted in hysteresis loops showing the force-displacement dependence. Beams with different constitutive laws for concrete and reinforcement and with differently defined cross-sections were modeled using SAP 2000 software. Results of t...
EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOURS OF ECC AND CONCRETE COMPOSITE REINFORCED BEAMS
ABSTRAT Engineered cementations composite (ECC) is a class of high-performance cementations composites with strain-hardening behaviour and excellent crack control. Substitution of concrete with ECC can avoid the cracking and durability problems associated with brittleness of concrete. Extensive inelastic deformation is achieved in ECC through Recron 3's fibre. ECC can be used in high rise buildings due to their appearance, high bearing capacity, ductility, Fast construction and cost effective. The aim of the paper is to study the flexural behaviour of ECC and concrete composite reinforced beams. Size of the beam is 1200mm x100mmx150mm. The percentage of Recron 3's fibre replaced is 0.5 %, 1.5%, 2.5% by weight of cement. Finally conventional beam is compared with ECC beam and also compare ECC at top and bottom of composite beams.