建築年代構成と地震動の繰り返し応答を考慮した地震動破壊力指標の評価および木造構造物被害関数の作成

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In general, seismic intensity, peak ground acceleration (PGA), peak ground velocity (PGV) and spectral intensity (SI) have been used as the indices of destructive power on earthquake motion. However, it is quite important to consider the number of earthquake response cycles in the vicinity of the maximum response and natural period of structures for predicting damage to structures. Especially, destruction of the wooden structure was expanded by aftershock after the main shock in 2004 Niigata-ken Chuetsu earthquake. In this study, the influence by accumulation of the earthquake motion on wooden structure destruction is considered. The fatigue response spectral intensity (FSI) of having taken the repetition of earthquake motion into consideration is applied, and a relation with wooden structure damage is considered. This index, which is called as FSI, is defined as integrated value on tripartite coordinates: natural period of wooden structures, pseudo-response velocity spectra and number of seismic response cycles. In addition, existing probability of natural period of wooden houses is taking into account in this index. FSI was calculated by using the response to recent earthquakes in Japan such as the 1995 Hyogo-ken Nambu earthquake, the 2004 Niigata-ken Chuetsu Earthquake and so on. As a result, it was clarified that accumulation of an earthquake motion influences structure damage and the earthquake motion destructive power index proposed by this research that accumulation of the earthquake motion can be taken into consideration is effective. Based on this study it is concluded that FSI value demonstrate the damage ratio more accurately than alternative indices such as seismic intensity, PGA, PGV, and SI value.
一般社団法人日本建築学会の論文
2007-03-20

建築年代構成と地震動の繰り返し応答を考慮した地震動破壊力指標の評価および木造構造物被害関数の作成

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