Predicting damage of wooden houses using fatigue response spectral intensity index considering number of seismic response cycles

摘要

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. These indices are not taken account of the repetition of an earthquake motion. However, the repetition of an earthquake motion influences damage of wooden houses. So 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 houses was expanded by aftershock after the main shock in 2004 Niigata-ken Chuetsu earthquake, 2007 Noto Peninsula Earthquake, and so on. In this study, the influence by accumulation of the earthquake motion on wooden houses destruction is considered. The fatigue response spectral intensity (FSI) of having taken the repetition of earthquake motion into consideration is proposed, and a relation with wooden houses damage is considered. In addition, existing probability of natural period and the construction age of wooden house is taking into account in this index. It is predicted to the wooden houses damage using the FSI index in recent earthquake. As a result, it was clarified that the earthquake motion destructive power index proposed by this research that accumulation of the earthquake motion can be taken into consideration is effective. And It is better to take the construction age into account, when the damage to wooden house is estimated.