Residual Seismic Capacity Evaluation for RC Buildings Considering Reduction of Seismic Performances

Abstract eng:
In order to evaluate residual seismic capacity of reinforcement concrete (RC) structures damaged due to earthquakes quantitatively, kinds of evaluation methods have been proposed by the previous researchers. In this paper, a method based on internal work (IW) of the structure and seismic capacity reduction factor of the members, for which numerical analysis is not needed, is reviewed. At the same time, a more accurate method based on the capacity spectrum method (CSM), which considers the reduction in strength, deformation capacity and hysteretic energy dissipation capacity of the damaged structural members separately, is also reviewed. To compare the CSM based method and the IW based method, reduction in the different seismic performances (e.g. strength, deformation capacity and hysteretic energy dissipation capacity) are considered integrally as the reduction in energy dissipated by the member. Then the seismic capacity reduction factor utilized in the IW based method is replaced by the energy dissipation residual ratio, and reduction in the difference seismic performances can be also considered in the IW based method. Through application of both the CSM based and IW based method on prototype frame models, result of the IW based method is found to be not conservative compared with the CSM based one due to ignoring difference among deformation of the members. To include influence of the member deformation, the IW based method is modified then and the following verification shows that the modified IW based method gives accurate and conservative estimation on result of the CSM based method without need of numerical analysis.

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