全局性能水准与构件局部损伤状态

传统的最大层间位移作为一个全局性的性能指标，超出给定的性能极限状态阈值就不能映射构件局部损伤状态。本文基于能量平衡原理，将塑性能量耗散和塑性铰的等效能相比得到累积塑性应变，将累积塑性应变这一反映局部损伤状态的损伤指标作为工程需求参数，假定一系列累积塑性应变阈值建立局部构件的易损性曲线族。以传统的最大层间位移作为反映全局性能水准的工程需求参数，建立结构全局性能极限状态下的易损性曲线。对比全局和局部易损性曲线，发现全局性能水准和局部构件损伤状态之间存在良好的相关性，通过易损性曲线的吻合程度可获得给定全局性能水准相对应的累积塑性应变阈值。进而也建立起全局性能指标与局部损伤状态的映射关系。基于累积塑性应变的机构易损性分析是一种更精确的易损性分析方法。

The correlation study of global performance states and local component injury status

Traditional maximum story drift is a global performance index,the exceedance of certain global performance limit states does not give any information on how severely the local plastic hinges injured.This paper was based on energy balance principle,the ratio of plastic energy dissipation to total energy of plastic hinges is cumulative plastic strain.Regard cumulative plastic strain as engineering requirement parameters which reflects local injury status.Assumed a series of cumulative plastic strain threshold,local component fragility curves can be established.Regard maximum drift as engineering requirement parameter which reflects global performance limit states.To establish fragility curves based on global performance limit states.A good correlation between global performance states and local component injury status when compared global and local fragility curves.The cumulative plastic strain threshold can be get from the degree of coincidence between these two kinds of fragility curves.There will be a mapping relationship between global performance limit states and local injury status.Vulnerability analysis based on the cumulative plastic strain is a more accurate vulnerability analysis method.