一种基于频响函数相似性的铁路桥墩损伤识别方法  

Damage Identification Method for Railway Pier Based on Frequency Response Function Similarity

作　　者：战家旺[1] 闫宇智 强伟亮 安志刚 张楠[1] ZHAN Jiawang;YAN Yuzhi;QIANG Weiliang;AN Zhigang;ZHANG Nan(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Technical Center,China Construction Sixth Engineering Division Corp.,Ltd.,Tianjin 300000,China;eijing Railway Fifth Survey Design Institute Engineering Testing Co.,Ltd.,China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国建筑第六工程局有限公司技术中心,天津300000 [3]中铁第五勘察设计院集团有限公司北京铁五院工程试验检测有限公司,北京102600

出　　处：《中国铁道科学》2018年第2期37-43,共7页China Railway Science

基　　金：国家自然科学基金资助项目(51678032);中国铁道总公司科技研究开发计划项目(2017G002-B)

摘　　要：提出了一种基于模型修正理论和频响函数相似性的铁路桥墩损伤定量识别方法。该方法以自振频率和特定频率带宽内的频响函数相似性系数构造目标函数,以墩身损伤度和基础约束弹簧损伤度为识别指标,采用优化算法实现对铁路简支梁桥墩的损伤评估。结果表明:在包含第1阶和第2阶频率在内的频率段内,频响函数相似性系数对损伤比较敏感;利用损伤识别方法可对桥墩不同位置及程度的损伤进行精确识别,且计算效率较高,经过10次左右迭代即可达到收敛;模型桥墩损伤识别结果与假定损伤相符,进一步证明了所提方法的可靠性和实用性。A method based on model updating theory andfrequency response function similarity was proposed for the quantitative damage identification of railway piers.The frequency response function similarity index in specific frequency bandwidth and natural vibration frequencies wereused to construct objective function.The damage degrees of the pier body and foundation constraint spring were respectively defined as the identification indexes.The damage assessment for railway simply-supported beam bridge pier was implemented by using optimization algorithm.Results show that the frequency response function similarity index is sensitive to damage in the frequency band containing the first order and second order frequencies.By the proposed damage identification method,both the damage location and damage degree can be identified accurately with high computational efficiency.The convergence can be achieved through about 10 iterations.The identified damage of a model pier agrees well with the simulated one,which has further verified the reliability and practicability of the proposed method.

关 键 词：铁路简支梁桥 桥墩 损伤 识别 频响函数相似性 有限元模型修正 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]