摘要
以移动荷载作用下桥梁位移响应的小波相关性构造目标函数,减少待识别参数,提出了一种基于有限元模型修正理论的简支梁桥损伤分步评估方法,并采用该方法对一简支钢梁数值模型的损伤进行识别。识别结果表明:所提方法仅需布置一个位移测点即可对不同位置和程度的损伤进行定量识别,迭代效率高;移动荷载速度、大小和测点位置对损伤的定量识别效果影响较小,且具有较强的抗噪能力。在实际桥梁测试中,采用桥梁损伤边界逼近识别方法可以实现对损伤位置的逐步逼近和损伤程度的精细化识别。
A sub-step method based on the FE model updating technique was proposed for the damage evaluation of simply-supported bridges. In the method,the wavelet transform correlation of the bridge displacement response under moving loads were taken as the objective function,and it reduced the parameters to be identified. A numerical example of a simply-supported steel beam model indicates that the proposed method can quantitatively identify the damage of different positions and degrees with only one displacement measuring point. The load velocity,load value and the location of measuring points have little influence on the quantitative identification of the damage,and the method has strong anti-noise ability. The damage boundary approach method can be used to approach the true damage locations and identify the damage extents precisely.
作者
闫宇智
战家旺
张楠
夏禾
李明
胡所亭
VAN Yuzhi;ZHAN Jiawang;ZHANG Nan;XIA He;LI Ming;HU Suoting(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;State Key Laboratory of High Speed Railway Track Technology,Beijing 100891,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第12期67-74,共8页
Journal of Vibration and Shock
基金
中央高校基本科研业务费专项资金资助项目(2016YJS111)
国家自然科学基金项目(51678032
51720105005)
中国铁路总公司科技研究开发计划项目(2017G002-B)
国家创新平台开放基金(2016YJ002)
关键词
简支梁桥
小波相关性
模型修正
定量评估
移动荷载
simply-supported bridge
wavelet transform correlation
FE model updating
quantitative evaluation
moving loads
