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2022, International Journal for Research in Applied Science and Engineering Technology
This research work focuses on comparison of seismic analysis of G+15 building stiffened with bracings and shear wall. The performance of the building is analyzed in Zone II, Zone III, Zone IV, Zone V. The study includes understanding the main consideration factor that leads the structure to perform poorly during earthquake in order to achieve their appropriate behavior under future earthquakes. The analyzed structure is symmetrical, G+15, Ordinary RC moment-resting frame (OMRF). Modelling of the structure is done as per staad pro. V8i software. Time period of the structure in both the direction is retrieve from the software and as per IS 1893(part 1):2002 seismic analysis has undergone. The Lateral seismic forces of RC frame is carried out using linear static method as per IS 1893(part 1) : 2002 for different earthquake zones. The scope of present work is to understand that the structures need to have suitable Earthquake resisting features to safely resist large lateral forces that ...
When a tall building is subjected to lateral or torsional deflections under the action of lateral loads, the resulting oscillatory movement can induce a wide range of responses in the building. As a result, lateral stiffness is a major consideration in the design of tall buildings. Bracing is a highly efficient and economical method of resisting lateral forces in a frame structure because the diagonals work in axial stress and therefore call for minimum member sizes in providing the stiffness and strength against horizontal shear. In this research study, four different types of bracing systems have been investigated for the use in tall building in order to provide lateral stiffness. The use of bracings has potential advantage over other scheme, the bracings are provided for peripheral columns. A sixteen story (G+15) building is situated at seismic zone 2 and is subjected to a wind speed of 220kmph. The building models are analyse by equivalent static analysis as per IS 1983:2002 using Staad ProV8i software and wind loads are calculated as per IS:875(part 3)-1987. The main parameters consider in this paper to compare the seismic analysis of buildings are lateral displacement, story drift, axial force, base shear. It is found that the x-type of bracings significantly contributes to the structural stiffness and reduces the maximum inter storey drift of R.C.C building than other bracing system. The peripheral column moments are also reduced as compared to the column moments to unbraced structure. The axial force on the columns for x king of bracings and minimum for system without any bracing similarly the base shear is more compared to any type of bracings. A comparative study between behaviour of concrete and steel bracings was also done performance of steel x bracing was 2.15% more efficient than that of reinforced concrete bracing, the complete weight of the structure was increased by 3.5% on using concrete bracings.
2021 •
In recent years, in regions of the highly seismic prone area, steel construction has changed from moment resistant frames to concentrically braced frames. To withstand earthquake forces, bracing part of the structural pattern by providing extra stiffness plays a crucial role in structural action. Concentric bracing in building frames is one of the most common horizontal load resistance patterns. For this reason, seven distinct models were created by changing the bracing pattern in the steel frame and analyzed for wind and seismic forces A 20-story steel frame structure is explored in this presented work. From this research, it can be inferred that the bracing factor will have a very significant impact on structural behavior under seismic loading. The most desirable bracing framework is the Backward bracing pattern. Horizontal displacement at the top floor is decreased by approximately 50 percent for Backward braced in frame structure compared to without bracing pattern.
— 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.
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).
Multistory buildings are mostly affected by earthquake force in seismic prone area. The major concern in the design of multistory building is the structure mainly to have enough lateral stability to resist lateral forces and to control the lateral drift of the buildings. The steel bracing system in reinforced concrete frames is viable for resisting lateral forces, steel bracing is easy to erect occupies less space and has flexibility in design for meeting the required strength and stiffness. The resistance to the lateral loads from wind or from an earthquake is the reason for the evolution of various structural systems. Bracing system is one such structural system which forms an integral part of the frame. Such a structure has to be analysed before arriving at the best type or effective arrangement of bracing. A braced frame is a structural system which is designed primarily to resist wind and earthquake forces. Members in a braced frame are not allowed to sway laterally In this study they are preparing a comparative study on a G+20 tall structure. In this structure they will compare bare frame with frames having X-type bracings at the corners. A three dimensional structure is taken, 20 stories is taken with storey height of 3m. The beams and columns are designed to withstand dead and live load only. Earthquake loads are taken by bracings. The bracings are provided only on the peripheral columns. Here structural modelling and analysis is done using analysis software Staad.pro which is a finite element based programming tool.
Steel Building in the world in the last decades, the steel structure for the building industry has played an important role in the most useful content. Providing the strength, stability and flexibility are the key purposes of seismic design. It is to design a structure under seismic load is required to perform. Structural bracing element in the system plays an important role in structural behavior during earthquakes. Bracing pattern of massive steel framed building can modify the behavior of the global seismic. In this research time history analysis is carried out for 7 storey and 12 storey steel frame building with different pattern of bracing system. Three types of sections i.e. ISMB, ISWB and ISB sections are used to compare for same patterns of beam, column and bracings. A software package SAP2000 is used for the analysis of steel buildings and different parameters are compared. The property of the section is used as per IS 800:2007 which incorporates Limit State Design philosophy. In this 7 storey and 12 storey steel frame building is analyzed for various types of concentric bracings like inverted V, X and without bracing and Performance of each frame is carried out and studied the comparatively through time history analysis.
Now a day the number of buildings are constructed and designed on the basis of architectural requirement and aesthetic view. Most of buildings are constructed in some spatial configuration like X shape, V shape with x and y coordinates non parallel to the structure. Earthquake is causing more damage to different configuration of building and their main problem is in the slenderness ratio. The main goal of this project is to make a comparative study of dynamic behavior of buildings with different configuration of structure in all seismic zones and different types of soils. In this study, a spatial configuration structure of 20stories up to 70m height of each storey height of 3.5m, with Shear wall and bracing at a different location in building is considered. The dynamic behavior of the building in all seismic zones II, III, IV, V and on different types of soil say hard, medium and soft soil was studied .The structure has outer periphery beams carrying R.C Shear wall of 200 mm thickness. The response spectrum analysis was carried out by using software of ETAB's version 9.7.4.considering bracing and shear wall at a different location in the building. The following seismic parameters were analyzed and the behavior of the structure was studied in detail.
The use of steel bracing systems for strengthening seismically inadequate reinforced concrete frames is a viable solution for enhancing earthquake resistance. In this paper, the seismic analysis of reinforced concrete (RC) buildings with different types of bracing is studied. A G+9 building is analyzed for seismic zone III as per IS 1893: 2002 using STAAD Pro software. The main parameters consider in this paper to compare the seismic analysis of buildings are lateral displacement, story 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 the frames. The bracing system improves not only the lateral stiffness and strength capacity but also the displacement capacity of the structure.
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