基于地震动参数的结构易损性表达方法研究

Research on structure vulnerability expression way based on seismic ground motion parameters

用贝塔分布函数对给定烈度下结构各个破坏等级的概率分布进行了破坏比概率密度的拟合,以地震动峰值作为地震动参数,根据烈度和加速度峰值的对应关系以对数插值方式计算了在任意一个峰值加速度下结构破坏比的倍塔概率密度分布及各个破坏等级的概率,从而使结构易损性的表达方式由烈度-震害等级构成的二维阶跃性易损性矩阵转化为由地震动参数-破坏比概率密度函数或地震动参数-各破坏等级的概率来表达的方式。试算结果表明,这种转化方法是可行的。本文为震害预测和地震经济损失估计提供参考。

The probability of each damage grade of structure in given intensity is fitted continuously by use of beta distribution function.And according to the corresponding relation between intensity and seismic ground motion parameter,the beta probability density distribution of structure damage ratio and the probability of every damage grade in each acceleration peak value are calculated on the basis of seismic peak motion parameter by logarithm interpolation way.Thus the tradition step distribution way of structure vulnerability,which is expressed by intensity versus earthquake damage grade is converted to continuous distribution way expressed by seismic ground motion parameter compared to destruction ratio.The practical data show that this transformed approach is effective and provides a reference for earthquake damage prediction and earthquake economic loss evaluation.