基于权重系数的既有结构风灾易损性分析  

Vulnerability Analysis of Existing Buildings under Wind Disasters Based on Weight Coefficient

作　　者：周静海[1] 闫妍[1] 孟宪宏[1] 李德倩 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁省住房和城乡建设厅建筑节能与建设科技发展中心,辽宁沈阳110001

出　　处：《沈阳建筑大学学报（自然科学版）》2017年第4期606-612,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51178275)

摘　　要：目的研究一种新型损伤评价方法,对既有建筑在风灾作用下的破坏进行有效预测.方法笔者提出了一种基于构件权重系数评估结构在风灾作用下损伤程度的方法,在以往对结构整体易损性进行分析的基础上通过定义权重得到每个构件在整个结构中的权重系数.该方法用构件位移角和构件权重系数的乘积定义损伤指数,以结构整体损伤指数作为评价结构易损性的参数指标,进而分析结构的易损性.结果对于风速在40 m/s以下的风灾预测,笔者提出方法与传统方法所得结果一致,严重破坏和倒塌破坏的概率基本为零,轻微破坏和中等破坏的概率也相对较小;当风速超过40 m/s时,传统方法对轻微破坏的概率预测已经达到92%,而考虑权重系数后为72%.结论经与传统方法得出的易损性曲线对比,考虑权重系数的风灾易损性分析方法更贴近于实际.This paper studies a newmethod based on the weight coefficient for damage assessment of structures in winds,and predicts the damage of existing buildings under the effect of storm effectively. A weighting factor is defined for each member to give its importance in the whole structure which is different from the structural analysis of the vulnerability as a whole previously. The method uses member displacement angle multiply member weight define damage index,further analysis the vulnerability of structures. For wind speed under 40 m/s,method this paper put forward and the traditional method have the same result： probabilities of serious damage and collapsed iszero,and probabilities of slight damage and medium damage is relatively small; When the wind speed is over 40m/s,the probability of slight damage is 92% with traditional method,72% with the method of considering weighting factor. Compared with traditional method,the disaster vulnerability analysis method considered weight coefficient is more close to the reality.

关 键 词：权重系数 位移角 整体损伤指数 非线性动力时程 易损性曲线 

分 类 号：TU375.4[建筑科学—结构工程]