Earthquake Protection View on Expanding Damage to Wooden Building in a Region Exposed by a Series of Cyclic Events: Simulation of Secondary Damage Caused by Aftershocks with Probabilistic Estimation of Degrading Seismic Resistant Performance

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  • 繰り返し荷重を受ける木造建物の損傷度重畳問題の取り組み：耐震評点劣化の確率評価を用いた後続地震による2次被害シミュレーション

Abstract

<p>Governments estimate earthquake damage affected by only the main event of an earthquake. However, the damage is amplified by aftershocks and subsequent cyclic events. From the point of view of disaster protection where estimation of full extent of the damage is important in canceling evacuation order, we propose an evaluation method for degrading seismic resistance of wooden buildings exposed to cyclic events using seismic capacity grade. The object region is Ojiya City and the event is Niigata Prefecture Chuetsu Earthquake of 2004. It is revealed that the ratio of degrading seismic resistant performance is larger in large intensity, small seismic capacity grade buildings and that the probability of amplified damage is larger in large intensity. The proposed approach is applied to Sapporo City, and the number of damaged buildings, deaths and recovery cost with each correspondence after the main shock are simulated.</p>

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