Evaluation of Building Damage based on Equivalent-Performance Response Spectra

Abstract eng:
We have proposed an equivalent-performance response spectrum (EPRS), to evaluate response by earthquakes. The EPRS is the transformation of the restoring force characteristics of a SDOF system into the response spectra (RS) of ground motions. The EPRS enables you schematic interpretation of how the change in structural characteristics affects the maximum response, as well as how the change in ground motion characteristics affects the maximum response at the same time. First in this paper, the formulation of the EPRS for two-layered soil and wooden houses are introduced. Then, influence of the yield base-shear coefficient of houses on the damage is shown for illustration. Next, in order to demonstrate the validity of the EPRS, we simulate the damage of wooden houses during the recent major earthquakes in Japan by using the RS of observed ground motions. As a result of the simulation, the damage, which is related to the maximum response of houses, is successfully explained by the EPRS based on the wooden houses in the affected area. Finally, using an attenuation relationship for RS on engineering bedrock together with the proposed EPRS, we have demonstrated how the moment magnitude, minimum distance from fault plane and local site conditions affect the damage or loss of wooden houses.

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