Damage Identification and Optimal Sensor Placement for Structures under Unknown Traffic-Induced Vibrations
Damage Identification and Optimal Sensor Placement for Structures under Unknown Traffic-Induced Vibrations
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DOI：
10.1061/(asce)as.1943-5525.0000550
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发表时间：
2017-03
影响因子：
2.4
通讯作者：
Jun Li;H. Hao;Zhi-Wei Chen
中科院分区：
文献类型：
--
作者：
Jun Li;H. Hao;Zhi-Wei Chen
摘要本文提出了一种未知交通振动下结构的损伤识别和传感器优化布置方法。对交通振动下的结构进行了响应重构，以建立不同时域响应之间的关系。利用实测的交通地震作用下结构的加速度响应，采用基于灵敏度的迭代模型修正方法进行结构损伤识别。对一个七层平面框架结构进行了数值模拟，以验证所提出的方法的性能。损伤识别进行的基础上的初始有限元模型的结构和交通诱导振动下的损伤状态下的测量响应。结构单元刚度因子迭代更新，直到重建的响应匹配的测量尽可能接近。提出了一种两阶段传感器优化布置方案，以获得更好的响应。
AbstractThis paper proposes a damage-identification and optimal sensor-placement approach for structures under unknown traffic-induced vibrations. Response reconstruction is performed for structures under traffic-induced vibrations to formulate the relationship between different sets of time-domain responses. Measured acceleration responses from a structure under traffic-induced ground motions are used for damage identification with a sensitivity-based iterative model updating method. Numerical simulations on a seven-story planar frame structure are conducted to verify the performance of the proposed approach. Damage identification is conducted based on the initial finite-element model of the structure and the measured responses from the damaged state under traffic-induced vibrations. Structural elemental stiffness factors are iteratively updated until the reconstructed responses match the measured ones as closely as possible. A two-phase optimal sensor-placement scheme is proposed for better response rec...