Response Evaluation of a Base-Isolated Building With Measured Accelerations During Tohoku Earthquake By Using Capacity Spectrum Method

Abstract eng:
After a catastrophic earthquake happens, buildings need to be evaluated its damage level in order to prevent human loss caused by damage or collapse due to an aftershock. Kobe earthquake revealed that most people evacuated from their own houses in fear of their damage even though the damage level was not severe. “Quick inspection of the damaged building” can be an option to evaluate the damage level and mitigate their fear. Shelter buildings such as school buildings need to be evaluated their damage level quickly to evaluate if they can be used or not. It needs, however, time to inspect buildings visually one by one. Tohoku earthquake revealed that high-rise buildings need to be evaluated their safety to re-open. The visual inspection needs much time to check whole members of high-rise building, then down-time elongated. Development of a quick damage evaluation system with sensors is indispensable to overcome these problems. The author has been conducting research to develop a residual seismic capacity evaluation system. According to the proposed method, the absolute acceleration at each story is measured by an instrumented accelerometer, and the displacement is derived from the measured acceleration with double integral technique. In order to eliminate the effect of the error component contained in the measured acceleration, the Wavelet transform technique is applied to decompose the measured acceleration into several components with certain frequency band in temporal domain. The components that has low frequency band are then eliminated as error components. Then the response of building, which is multi-degree-offreedom system, is simplified down to the single-degree-of-freedom system by using the capacity spectrum method. The damage level is evaluated with the simplified force-displacement relationship of SDoF.

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