【摘要】 基于汶川地震现场调查获得的170个场点的建筑物震害指数,把建筑物分成砖混、穿斗、砖木、老旧和框架5类典型结构,分析了相同场点上砖混和其余4类建筑物震害对比和线性相关系数.结果表明,震害指数小于0.1和大于0.8时各类建筑物震害接近,而在0.2—0.6区间时震害差异明显,但总体上各类建筑物震害之间存在较高的相关性.为分析震害指数和强震动参数随距离衰减的相关性,进一步拟合了断层距小于500km的三分量峰值加速度衰减关系,对其归一化后同震害指数衰减的对比表明,峰值加速度衰减与砖混和砖木建筑物的震害指数衰减符合较好,与老旧建筑物的偏离较大.为提高可比性,本文还选取调查场点和强震动记录台站的经纬度位置相差均小于0.1°的57对数据,计算出加速度和速度峰值,以及加速度、速度和位移谱峰值,统计分析了这些峰值同震害指数之间的线性相关系数.本研究结果对抗震设计和震害指数与地震动参数之间的相互估计提供了有益参考.更多还原

【Abstract】 Based on the field damage investigation at 170 spots for five building types,including brick-concrete,brick-timber,through type timber frame,frame structure and old buildings,in Wenchuan earthquake,the damage indices were compared between brick-concrete buildings and other four types at same spot and the corresponding correlation coefficients were obtained.Results show significant variation among different buildings for damage index in 0.2—0.6,but little variation in other range,and damage indices are highly correlated on the whole.The three directions’ PGA attenuation relationships were obtained using records in 500km region from the fault in order to analyze the correlation of damage indices and ground motion parameters.The comparison of the attenuation relations between normalized PGA and damage index indicates damage indices of brick-concrete and brick-timber buildings fit PGA well but damage indices of the old buildings damage deviate obviously.To improve the comparability,57 pairs of strong motion records and adjacent spots within 0.1° along longitude and latitude were chosen to analyze linear correlation coefficients between PGA,PGV,PSA,PSV,PSD and damage indices.The results of this study are useful in seismic design and mutual estimation between strong motion parameters and building damage indices.更多还原