COMPARATIVE ANALYSIS OF A TALL STRUCTURE WITH OR WITHOUT BRACINGS CONSIDERING SEISMIC LOAD

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.