Lateral Analysis of Irregular Geometrical High Rise Structure with Bracings

The irregularity in the building structure may be due to irregular distribution in their mass, strength and stiffness along the height of building. When such buildings are constructed in high seismic zones, the analysis and design become more complicated. The primary objective in designing an earthquake resistant structure is to ensure that the building has enough ductility to withstand the earthquake forces. A braced frame is a structural system designed to resist wind and earthquake forces. In this study C shaped irregular structure is considered and the behaviour of different type of bracings with variation in positions on this irregular structure under lateral load is analyzed. Also the effect of lateral load from various directions is considered. The bracing systems are X-braced frames, V braced frames, diagonal braced frames, and eccentric braced frames are studied that which type of bracings are perform under better seismic action comparing with paired structure. Response spectra analyses were performed. The structural responses of frames are studied in terms of time period, storey drift, and storey shear and storey displacement. The result showed a good improvement in lateral resistance of frames with incorporation of bracing. The result reveal that X bracings is efficient to resist lateral load compared with other type of bracings.