EFFECT OF STEEL BRACING ON VERTICALLY IRREGULAR R.C.C BUILDING FRAMES UNDER SEISMIC LOADS (original) (raw)
Related papers
A Study on Seismic Analysis of Steel Buildings with Different Bracing Systems
2019
In this paper seismic performance of two types of bracing systems; concentric bracing systems and global bracing systems are compared and studied along with Moment Resisting frame to find out the best configurations. Nonlinear static Push over analysis is performed to obtain capacity curves from which global response of structure is studied. Response spectrum analysis is performed to obtain storey displacements and storey drift ratios for buildings located in Earthquake Zone-V and medium soil condition. Parameters like fundamental period of vibration, stiffness, storey displacements and storey drifts are studied for different configuration of bracings considered and for 20m, 60m& 100m heights of building. Results show every bracing improve seismic performance but relatively GBS enhances significantly followed by K-Braced Frame (KBF) and X-Braced Frame (XBF).
COMPARATIVE STUDY OF BRACING SYSTEMS FOR IRREGULAR TALL STEEL STRUCTURES BASED IN DIFFERENT CITIES
In a high-rise steel building, bracing system is an essential commodity for inadequate lateral reinforcements in the structure. Therefore, bracing system is a necessary solution for these lateral deflections caused by lateral loads. The resistance to wind and seismic load is one of the factor for the sustainability of the high rise building. For present study, plan irregularity with (A/L) ratio of (40/65) = 0.62 is considered as per IS 1893 (Part 1): 2002. In this study, the steel structure is assumed to be at 4 different cities with different seismic zones those cities are Agra, Bengaluru, Mumbai and Roorkee with five types of bracing systems. All cities are compared with an unbraced model of Roorkee city. A G+14 structure is analyzed for seismic zone II, zone III and zone IV as per IS: 1893-2002 using STAAD pro software. Dead and live loads are sustained by beams and columns whereas; the lateral loads are carried by bracing systems only. The bracings are provided at every corner of the structure. The structure is studied for nodal displacements in X-direction and Z direction in all the floors, axial force and bending moment for the ground level column is compared and finally, drift index and corresponding percentage change in top roof is calculated.
Analysis of Seismic Design Steel Braced Frame
From last few decades steel structures plays an important role in construction industry. Steel is most essential material for building construction. Steel structure are ductile in nature also they have good strength and stability. Steel structures give sufficient warning prior to the failure by means of excessive deformations. The design of structure should be such that it can sustain in seismic load. This paper emphasis on a analysis of nonlinear and static pushover for the G+5 storey steel frame building with unbraced and braced systems. A variation of the lateral shear force with respect to the lateral deformation of steel frame building is calculated by pushover analysis. Shear capacity of any structure is enhanced with the application of the steel bracing. The G+5 storey industrial steel frame building is designed for crossed X bracing and V bracing and comparison is made between the bare frame and frame with bracing and performance point of structure is carried out through nonlinear static pushover analysis. Analysis is done by using the ETABS-2015 software.
Seismic Analysis of RC Building with Steel Bracing
Scope, 2023
A multi-storey building is generally made up of RCC frame. A reinforcement building is designed for multipurpose like residence, business, school, hospital etc. A reinforcement building should be designed to have a capacity of carry gravity loads(Azad and Abd Gani 2016). The most common gravity load acting on building are dead load, live load and snow load. Apart from these loads a buildings are also subjected to lateral load. The lateral load generated due to earthquake. Lateral load is reversal in nature which cause develop high stresses on building and generated sway moment which cause a building may damage(Badoux and Jirsa 1990). Therefore, it is very important to designed a RCC building to have sufficient strength to resist or transmit these lateralload(Srivastava et al. n.d.). There are several ways to resist or transfer this load. Steel bracing system in RCC frame building is most way to counteract these seismic load and provide safety. By providing steel bracing in RCC frame building the strength of building is improved, bracing is used to stabilize laterally for the majority of the tall building structures. After providing steel bracing in RCC frame building load will be transferred to the frame and passes on to the braces, by passing weak column while increasing strength. The main advantages of using steel bracing are their high strength, stiffness and economical in cost(Kumar et al. 2021). Objective: 1. Different configuration of steel braces (X, V and Inverted-V) are used to resist the lateral loads and choose most effective bracing configuration. 2. To determine Storey displacement and Storey drift for all four bracing system.
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
This work time history analysis is carried out for G+23 storey steel frame building with different pattern of bracing system. The member property of beams 300mm X 400mm and columns 300mm X 500mm and ISLB250 sections are used to compare for same patterns of beam, column and bracings. A software package ETABS SOFTWARE is using for the analysis of steel buildings and different parameters are compared. The property of the section is used as IS 456:2016 and per IS 800:2007 which is analysis for various types of bracings like X, V, inverted V, Eccen Forward, Eccen Back and without bracing and Performance of each frame is carried out and studied the comparatively through Response Spectrum Method as per IS:1893:2016. In this study model a G+23 with Square Shape building Plan 52m X 52m, height of each floor is 3.2m and Structure in Etabs software by Response Spectrum Method and Analysis the Earthquake analysis of the Structure in seismic zones III with soil Medium conditions. Parameter Using:Type of Building: RC buildings with and without Steel Bracing System
Seismic Response of Multi-Storey Building Equipped with Steel Bracing
— Steel bracing has proven to be one of the most effective systems in resisting lateral loads. Although its use to upgrade the lateral load capacity of existing Reinforced Concrete (RC) frames has been the subject of numerous studies, guidelines for its use in newly constructed RC frames still need to be developed. In this paper the study reveals that seismic performance of moment resisting RC frames with different patterns of bracing system. The three different types of bracings were used i.e. X-bracing system, V-bracing system and Inverted V-bracing system. This arrangement helped in reducing the structural response (i.e. displacement, interstorey drift, Shear Forces & Bending Moments) of the designed building structure. An (G+6) storey building was modelled and designed as per the code provisions of IS-1893:2002. And linear analysis is been carried out in the global X direction. The analysis was conducted with a view of accessing the seismic elastic performance of the building structure.
Effects of Vertical Irregularity in Steel Braced Frames on Response to Earthquake
Journal of Civil Engineering and Architecture, 2018
This paper deals with the irregular profile of braced steel frame building in vertical direction with shear link bracing systems. The underlying fact of the paper is the effect of seismic force in braced frames with different types of irregularities including mass irregularity, mass discontinuity and overhanging mass. For each successive model, the position of shear link bracings has been fixed to make the study effective. This study has investigated the vulnerable effect of irregular profiles in steel frame buildings. To attain the behavior of each frame, linear time history analysis method has been adopted for the present study. FEMA356 standard has been used here for linear time history analysis. Investigations on different frames exhibit that regular profile with symmetry in mass is more efficient while using overhanging mass is detrimental considering the time dependent displacements and accelerations.
Influence of Bracings on the Seismic Behavior of RC Framed Irregular Structures
In general, earthquake is the main cause of damage of structures. During earthquake many buildings collapse mainly due to the presence of irregularity in the building. The irregularities in the buildings are commonly due to architectural, functional and economic concept. To strengthen the structure the bracings are provided which resists the lateral forces. Hence it is necessary to analyze the response of irregular structure subjected to seismic forces. In present work the G+9 storey RC framed structure is analyzed by response spectrum and time history method. The five structural configurations are used for this study as Regular, IRR1, IRR2, IRR3 and IRR4. The models are analyzed for response of irregular structure compared to regular structure subjected to seismic loads. The RC framed models are analyzed for structure with and without bracings. The X bracing, V bracing and K bracings are used in this study. The analysis of RC framed structure with and without bracing is carried out using ETABS software. The main parameters considered in this paper to compare the seismic performance of the structure by response spectrum method are modal period, storey shear, displacement and drift. The parameters considered in the time history method are base shear, joint displacement and column force. From the analysis, use of X bracing to all models is found more effective compared to V bracing and K bracing.
The high-rise buildings that are made of RCC frame, the greater importance is given to make structure safe against lateral load. These loads are produced due to wind, earthquakes etc. To resist lateral load acting on bu or RCC bracing systems are provided. The use of RCC bracing has potential advantage than other bracing like higher stiffness and stability. This study aimed the comparison of different RCC bracing system under seismic behavi buildings. Also three structural configurations used in this paper are Moment Resisting Frames (MRFs), X storey (G+10) building. The bracing systems provided on periphery of the column. The frame models are analyzed as per IS: 1893 ETABs software's. The parameters which are considered in this paper for comparing seismic effect of buildings are base shear and storey displacement. The results showed that X-braced frames are more efficient and safe at time of earthquake when compared with moment resisting frames and V rise buildings that are made of RCC frame, the greater importance is given to make structure safe against lateral load. These loads are produced due to wind, earthquakes etc. To resist lateral load acting on building different types of steel or RCC bracing systems are provided. The use of RCC bracing has potential advantage than other bracing like higher stiffness and stability. This study aimed the comparison of different RCC bracing system under seismic behavior in high rise buildings. Also three structural configurations used in this paper are Moment Resisting Frames (MRFs), X-Braced Frames (XBFs), V-Braced Frames (VBFs) for 11 storey (G+10) building. The bracing systems provided on periphery of the column. e frame models are analyzed as per IS: 1893-2000 using STADD.ProV8i and ETABs software's. The parameters which are considered in this paper for comparing seismic effect of buildings are base shear and storey displacement. The results showed rames are more efficient and safe at time of earthquake when compared with moment resisting frames and V-braced frames. rise buildings that are made of RCC frame, the greater importance is given to make structure safe against lateral load. These loads are produced due to ilding different types of steel or RCC bracing systems are provided. The use of RCC bracing has potential advantage than other bracing like higher stiffness and stability. This study aimed the or in high rise buildings. Also three structural configurations used in this paper are Moment Braced Frames (VBFs) for 11 storey (G+10) building. The bracing systems provided on periphery of the column. 2000 using STADD.ProV8i and ETABs software's. The parameters which are considered in this paper for comparing seismic effect of buildings are base shear and storey displacement. The results showed rames are more efficient and safe at time of earthquake when
Seismic Response of R C Building With Different Arrangement of Steel Bracing System
In general the most suitable choices in improvement of reinforcement concrete frame against lateral loading is used steel bracing system. The use of steel bracing has potential advantage over other scheme like higher strength and stiffness, economical, occupies less space, adds much less weight to existing structure. In this study, the seismic analysis of reinforced concrete (RC) buildings with different types of bracing (Diagonal, V type, inverted V type, X type) is studied. The bracing is provided for peripheral columns. A seven-storey (G+6) building is situated at seismic zone III. The building models are analyze by equivalent static analysis as per IS 1893:2002 using Staad Pro V8i software. The main parameters consider in this paper to compare the seismic analysis of buildings are lateral displacement, storey drift, axial force, base shear. It is found that the X type of steel bracing significantly contributes to the structural stiffness and reduces the maximum interstorey drift of R.C.C building than other bracing system.