基于应变模态的网架结构损伤识别模型试验研究  

Structural damage identification model test research of space truss structure based on strain modal

作　　者：龚治国[1,2,3] 赵鹏[1,2] 高润东[1,2] 

机构地区：[1]上海市工程结构安全重点实验室,上海200032 [2]上海市建筑科学研究院,上海200032 [3]上海市建筑科学研究院科技发展有限公司,上海200032

出　　处：《武汉大学学报（工学版）》2015年第4期526-532,共7页Engineering Journal of Wuhan University

基　　金：住房与城乡建设部研究开发项目(编号:2010-K2-2);上海市人才发展资金资助项目(编号:201328);上海市工程结构新技术重点实验室资助项目(编号:HT0100103D001)

摘　　要：制作了大比例的空间钢网架结构试验模型,并采用将部分原杆件替换为截面面积较小杆件的方式模拟了结构的损伤,包括上弦、下弦、腹杆等单构件的损伤以及它们之间的组合损伤.通过锤击法直接测试分别获得完好及不同损伤工况下试验模型的部分应变模态参数,将各损伤工况与完好工况下试验模型的应变模态参数进行对比,可以成功识别出网架模型损伤的发生以及部分较为重要杆件损伤发生的位置,随后对试验中不同杆件损伤识别效果的规律进行了归纳,并在结合该网架试验模型动力特性数值分析结果的基础上对损伤识别效果的原因进行了分析,为网架结构损伤识别的实际工程应用和开展相关研究提供了参考和借鉴.A large scale space truss structure model is manufactured and some damage cases of the model are simulated by replacing original member to damaged member which has smaller section,including top chord,bottom chord,web member and their combination.Using hammering method some strain modal parameters of the undamaged and damaged model are acquired directly;and by comparing these obtained strain modal parameters the damage of the model and a part of damage positions of some relatively important members are recognized successfully;then the damage recognition results of different cases are compared and analyzed through numerical simulation of the model dynamic characteristics.These test results can be referenced in the practical engineering and relevant research.

关 键 词：网架结构 损伤识别 结构健康监测 应变模态 模型试验 

分 类 号：TU356[建筑科学—结构工程] TU317