New Index for Earthquake Damage in Considering Response Spectra and Number of Cycle

考虑了反应谱和反应周期数，提出了一种新的地震震害评价指标。迄今为止，最大加速度已被作为震害的典型指标。尽管在1993年日本钏路树地震和1994年美国北岭地震中记录到超过1000加仑的巨大加速度，但几乎没有发生结构破坏。在解释结构损伤时，不仅要考虑最大加速度或最大响应加速度，而且要考虑大响应加速度的循环次数。本研究提出了疲劳响应谱。该谱由响应谱和周期数组成，即x轴为结构的自然周期，y轴为各响应级的周期数，z轴为响应级。疲劳响应加速度谱、疲劳响应速度谱和疲劳响应位移谱可分别由响应加速度谱、响应速度谱和响应位移谱来评价。根据疲劳响应谱，估计疲劳谱强度（FSI）值。该值定义为疲劳响应谱的体积。利用1993年kushiroo -oki地震、1993年Notohanto-oki地震、1994年北海道Toho-oki地震、1994年三陆町haruko -oki地震和1995年hyogken - nambu地震资料，研究了FSI值与地震震害的相关性。这项研究的重点是对木制房屋和供水管道的破坏。

This study deals with a new index for earthquake damage in considering response spectra and number of cycle of response. The maximum acceleration has been used as a typical index for earthquake damage so far. Although great acceleration more than 1,000gal was recorded in the 1993 Kushiro-oki earthquake in Japan and 1994 Northridge earthquake in USA,little structural damage occurred. Not only the maximum acceleration or maximum response acceleration but also the number of cycle of great response acceleration should be considered for explanation of structural damage.Fatigue response spectrum is proposed in this study. This spectrum is combined with response spectrum and number of cycle, that is, x axis is natural period of structure, y axis is number of cycle in each response level and z axis is response level. Fatigue response acceleration spectrum, fatigue response velocity spectrum and fatigue response displacement spectrum can be evaluated from response acceleration spectrum, response velocity spectrum and response displacement spectrum, respectively. Based on fatigue response spectrum, FSI value (Fatigue Spectral Intensity) was estimated. This value is defined as a volume of fatigue response spectrum.The correlation between FSI value and earthquake damage is investigated using data of the 1993 Kushiro-oki earthquake, 1993 Notohanto-oki earthquake, 1994 Hokkaido Toho-oki earthquake, 1994 Sanriku Haruka-oki earthquake and 1995 Hyogoken-Nambu earthquake. This study is focusing on the damage to wooden houses and water supply pipelines.