Analysis and Strengthing of Soft Storey Building with Equivalent Diagonal Strut at Center under Earthquake and Wind Load

Buildings are classified as having a soft storey if that level is less than 70% as stiff as the floor immediately above it or less than 80% as stiff as the average stiffness of the three floors above it. Open ground storey buildings are called soft storey building, whereas their ground storey may be soft or weak. The soft or weak storey commonly exists at the ground storey level, but it might be at any other storey level.The behaviour of soft storey building in earthquake and wind load is very crucial because soft storey building is more flexible in lateral load condition, vibration is happen in soft storey building so we provide shear wall in soft storey building (shear wall resist the effect of earthquake and wind load). The effect of infill panels on the response of RC frames subjected to seismic action is widely recognized and has been subject of numerous experimental and analytical investigations over last 5 decades. In this work G+5 storey (six storeys) building is taken in which floor wise (changing soft storey position form first to six storeys) soft storey is analysis and its contribution in the behaviour of the structure is examined. Soft storey is more flexible as above storey and we will conclude by getting best geometry in each seismic zone; thereby geometry of the building shall be optimized by considering a plan of 15×15 m2 building for seismic zone II and for wind load of basic wind speed 39 km/h. The main objective of this thesis is to investigate the effective building frame with different geometry to withstand under different seismic parameters. The investigation is to be carried out by conducting-(a) Modelling of building frames considering different geometries (b) Analysis of frames considering Earth quake and Wind load (c) Critical study of results in term of moments, forces and deflections