New Index for Earthquake Damage through Fatigue Response Spectrum Intensity and Application to Immediate Grasping for Earthquake Damage

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This study proposes an index for prediction of damage to wooden houses, RC structures, pipeline, and so on. Since the structures are affected by a fatigue damage, it is inevitable in predicting damage to structures to consider the number of seismic response cycles of the large seismic response. In this study, an index for predicting damage to wooden houses is proposed in taking account of number of seismic response cycles and the natural period of structures. This index, which is called as 'Fatigue response Spectral Intensity (FSI value)', is defined as integrated value on tripartite coordinates ; natural period of wooden houses, pseudo-response velocity spectra and the number of seismic response cycles. In addition, existing probability of natural period of wooden houses is taking into account in this index.This FSI value was calculated by using the data in the recent earthquakes in Japan and worldwide such as the 1994 Hokkaido Toho-oki earthquake, the 1994 Sanriku Haruka-oki earthquake, the 1995 Hyogoken-Nambu earthquake, 1997 Kagoshimaken-Hokuseibu earthquake, 1999 Taiwan Ji-Ji earthquake and so on. This index was able to represent the damage to wooden houses more accurately than the alternative indices such as maximum acceleration and S1 value.