ABSTRACT
Concept of capacity based design of structures is the spreading of inelastic deformation demands in a structure in such a way so that the formation of plastic hinges takes place at predetermined positions and sequences. The capacity design is therefore, an art of avoiding failure of structure in brittle mode. Shear failure is brittle mode of failure, hence shear capacity of all components capacity based design are made higher than their flexural capacities so as to avoid shear failure.Therefore,itisbetterto makebeams tobetheductileweaklinksthancolumns. In the capacity design of structures for earthquake resistance, distinct elements of the primary lateral force resisting system are chosen and suitably designed and detailed for energy dissipation under severe imposed deformations. The critical regions of these members, often termed as plastic hinges, are detailed for inelastic flexural action.
The prime objective of this work is to demonstrate the utility of capacity based design method as compared to conventional design method. In this study, the building of five storeys have been analysed and designed by capacity based design method. Parametric study has been undertaken for the column moments, column shear and beam shear for the buildings. The building is designed by capacity based design for earthquake zone II. It has been shown that column moments, column shear and beam shear for the five storey building obtained from capacity based design method are more than those obtained from design method.
