Study on the Influence of Post-Yielding Stiffness to the Seismic Response of Building Structures

Abstract eng:
The response dispersion of structures under strong earthquakes significantly restricts the implementation of performance based seismic design. Besides the variation of earthquake inputs, the inelastic characteristics of structures themselves are also the influence factors on the seismic response dispersion of structures, in which the post-yielding stiffness is key parameters. In this paper the inelastic time-history analysis of numbers of SDOF and MDOF systems are studied to investigate the influence of post-yielding stiffness on the inelastic seismic response and the dispersion. The analytical results show that, (1) for SDOF system, the larger positive post-yielding stiffness will result in smaller the maximum displacement and especially the residual displacement, (2) for the MDOF system, the larger positive post-yielding stiffness results in more uniform distribution of hysteresis energy dissipation and the smaller variation of the maximum inelastic story drift. Hence, the larger of the positive post-yielding stiffness will result in a better control of structural performance under earthquake, so that the performance based design can be easier implementation. The methods to increase the post-yielding stiffness and some practical examples are finally presented in this paper.

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