基于环境激励的厂房结构损伤诊断与安全评价  

Damage Diagnosis and Safety Evaluation of Underground Powerhouse Under Ambient Excitation

作　　者：张建伟[1] 李火坤[2] 练继建[3] 杨敏[3] 

机构地区：[1]华北水利水电学院水利学院,郑州450011 [2]南昌大学建筑工程学院,南昌330031 [3]天津大学建筑工程学院,天津300072

出　　处：《振动．测试与诊断》2012年第4期670-674,694-695,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(编号:51009066;50909049);国家杰出青年科学基金资助项目(编号:50725929);河南省基础与前沿技术资助项目(编号:102300410037);郑州市科技攻关资助项目(编号:10PTGS507-6)

摘　　要：以"5.12"汶川地震震中某地下厂房上部结构为研究对象,进行基于环境激励的厂房结构损伤诊断与安全评价研究。根据现场实测的结构动位移时程,分别用随机子空间方法和系统特征实现方法对厂房结构的模特参数进行时域辨识,依据结构特定部位损伤会引起结构模态参数变化的原则,提出运用距离的概念对结构所属的健康状况进行量化评价的方法。研究结果表明,厂房上部结构基本完整,与现场取芯结果一致。研究成果对于类似大型水工结构的安全检测与评价具有一定的参考价值。Based on the upper part of a certain underground powerhouse in the center of '5.12' Wenchuan earthquake, damage diagnosis and safety evaluation of the powerhouse under ambient excitation is studied. According to the time-displacement data of structure observed on the site, the modal parameters of structure are identified by stochastic subspace identification(SSI) and eigensystem realization algorithm (ERA). Results are compared by the different methods. Combined with the dynamic characteristic of undamaged and damaged cases, a non-destructive testing and safety evaluation method is put forward for large-scale hydraulic structures. The health condition of structure can be quantified by distance concept. The testing results have a good consistance with the results of measure by boring. The study has referenced value for non-destructive testing and safety evaluation of similar large-scale hydraulic structures.

关 键 词：水工结构 环境激励 水电站地下厂房 损伤诊断 安全评价 

分 类 号：TV312[水利工程—水工结构工程] TV323