Seismic Capacity Diagram for Damage Based Design

Abstract eng:
In this paper, the seismic capacity based on damage concept is proposed for performance based design. The design approach is called Seismic Damage-based Capacity Diagram. This is presented as a graphical plot of strength capacity against the displacement of the structures, where as seismic damages of the system are shown in terms of damage indices. The seismic capacity diagram was computed by nonlinear static analysis (Cyclic Pushover Method). The well-known Park-Ang damage model was employed in the computation of damage index. Modified Takeda model was selected as the hysteretic behavior of structures. A 15 storey building was analyzed by pushover method. It was found that the damages in the lower floors were greater than those in the upper floors. This is mainly due to cumulative damage resulting from absorbed hysteretic energy in the cyclic load reversal. The application to performance based design was investigated in terms of demand–capacity diagrams. Finally, the performance point was evaluated on damage basis.

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