大跨度连续刚构桥健康监测加速度传感器优化布置研究  

Study on optimal placement of acceleration sensors for health monitoring of a long-span continuous rigid-frame bridge

作　　者：宗周红[1] 孙建林[1,2] 徐立群[1] 李嘉维[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建省高速公路建设总指挥部,福建福州350001

出　　处：《地震工程与工程振动》2009年第2期150-158,共9页Earthquake Engineering and Engineering Dynamics

基　　金：福建省高等学校新世纪优秀人才支持计划项目(TW2006-29);福建省科技三项(2006F5001);福州大学科技发展基金联合资助(2006-XQ-29)

摘　　要：本文以一座145m+2×260m+145m的大跨度连续刚构桥为背景,首先介绍了传感器优化配置算法、评估准则和安放位置的选择方法;其次,建立了该连续刚构桥的三维有限元模型,进行了环境振动试验,得到了桥梁的基本动力特性;再次,基于MAC矩阵和F isher信息阵标准为理论基础的传感器优化布点算法,对桥梁健康监测加速度传感器布点方案进行了研究;最后结合该桥的实际情况,提出了加速度传感器优化布置方案。实时健康监测表明:基于本文的传感器布置方法实时监测能够获得该桥梁前10阶振型,可满足桥梁长期监测的需要。In this paper, a long-span continuous rigid frame bridge with span arrangement of 145 ＋2×260 ＋ 145m was selected as an engineering background. Firstly, the selection methods of acceleration sensor position were briefly introduced, considering the optimal placement algorithm and the evaluation criterion, and secondly, a threedimensional finite element （FE） model of the bridge was constructed, and the field ambient vibration testing was conducted, then, the dynamic characteristics of the bridge were extracted from the FE analysis and the testing. Thirdly, the optimal placement scheme of acceleration sensors for the bridge health monitoring was studied, on the basis of the MAC matrix and standard of Fisher＇ s information matrix. Finally, the optimal placement scheme of acceleration sensors was presented according to the real damage condition of the bridge. The real time monitoring resuits indicate that the first 10 orders of vibration frequencise and modal shapes can be extracted and the scheme can meet the needs of the bridge＇ s long-term health monitoring.

关 键 词：连续刚构桥 桥梁健康监测 MAC矩阵 FISHER信息阵 传感器优化布置 

分 类 号：TU317.1[建筑科学—结构工程] TU375.4