BEHAVIOR OF R.C.FRAMED BUILDINGS WITH SHEAR WALL

Abstract

The increase in population and the paucity of land, particularly in urban areas has compelled designers to go in for sky-scrapers. For low to medium rise buildings, the analysis and design with respect to lateral force has generally been a process of checking the vertical load system for its ability to resist lateral forces. However, for tall building the vertical load resisting system is inefficient in resisting lateral forces. Hence in tall building of reinforced concrete, the lateral loads are commonly resisted by specially provided shear walls. For building having of 15 to 40 storeys, the shear wall-frame system has been found to be the most acceptable one. The present study pertains to lateral load analysis of some shear wall frame systems. The analysis has been carried out by using STAAD Pro.2004. to determine the forces, deflections and point of contraflexure in various structural components, viz, beams, columns, link beams and shear wall. Two examples have been solved using STAAD Pro.2004.The first one is an unsymmetrical multistory building with two cases; firstly shear walls extend upto top and secondly where they are not provided in the top storeys and the effect of change in thickness of shear walls have also been considered. The second building in symmetrical with four cases, i.e., symmetrical shear wall and secondly one of the shear wall removed to introduce unsymmetry. In this example, the curtailment of shear wall been considered for sysmmetrical building. The shears, bending moments and deflections have been studied in all cases in each example and also point of contraflexure is compared in two examples. One the basis of this study, some useful conclusions are drawn.