09-10-2014, 02:38 PM
Buildings are seldom, if ever, perfectly symmetric. Thus building vibration frequently involves coupling of translational and torsional modes. In most of the analysis and design buildings, floor slab is assumed as rigid in its own plane because of its high iii-plane stiffness. However, for certain configurations this assumption is not valid. Part-I of this thesis deals with buildings having rigid floor diaphragms while Part-11 addresses the response of buildings flexible floor diaphragm. In the Part-I of this thesis, a flexibility based approach is presented to locate the center rigidity, shear center and center of twist of a multistorey building. Further, a convenient anal procedure is presented to compute design response. The technique accounts for all established definitions of static eccentricity. Floor diaphragms in some buildings may have considerable flexibility in their own plane (e.g., buildings with long and narrow plan, buildings with horizontal offset). In such buildings design seismic force for a particular floor can not be applied at one single point (say,