Comparative Study of Steel Bracing and Its Effects on Irregular Building under Seismic Load

In practical Civil engineering work, we classify high rise building as regular shaped (symmetrical) and irregular shaped (unsymmetrical) building. The introduction of irregularity in structure create complex while it’s design. Also its behavior varies under different kind of loadings and other integral design factor. So it is very important to study behavior of unsymmetrical buildings with respect to different kind of loading and other design parameter. Usually Plus shape, C-shape, L-shape, H-shape etc. building can be seen. Among them, we are going to have a comparative study of plus shape, C-shape and L-shape unsymmetrical building. When a high rise building is constructed it is subjected to various loads like dead load, live load, seismic load, wind load, snow load etc. These different types of loadings cause lateral or torsional deflections. Seismic loading must be taken into account for the design of high rise buildings. It can resist base shear, story drift and story displacement as well. In this comparative study we are going to analysis a high rise building with seismic load. For seismic analysis we are going to use zone IV using equivalent static analysis method as per IS 1983:2002 for G+15 building. Karthik Reddy studied a 16 storey regular building with 62 m/s wind speed and zone II seismic activity and found that x bracing arrangement is more suitable. Kartik K. M. noticed that irregular buildings show in increase in storey drift, lateral displacement but reduction in base shear, inverse for regular building. Loveneesh Sharma realized that L shape building shows poor resistance to the lateral forces with minimum swaying of columns requiring almost equal cost for heavy mass transfer. Masood Ahmed Shariff discovered cross bracing shows minimum lateral displacement and storey shear for the irregular multi storey building. The main parameter which are to be considered for seismic analysis of a high rise structure include structural stiffness, storey drift etc. These parameters can be achieved with the help of bracing systems. Bracing is useful to resist base shear of the high rise building. There are X shape, V shape, K shape, Diagonal shape bracing commonly can be seen. In this comparative study we are comparing X shape and diagonal shape steel bracing.