Assessment of bridge expansion joints using long-term displacement measurement under changing environmental conditions  

作　　者：Youliang DING Aiqun LI 

机构地区：[1]School of Civil Engineering,Southeast University,Nanjing 210096,China

出　　处：《Frontiers of Structural and Civil Engineering》2011年第3期374-380,共7页结构与土木工程前沿（英文版）

基　　金：the support of the National Natural Science Foundation of China(Grant Nos.50725828,50808041 and 50978056);the Ph.D.Program Foundation of the Ministry of Education of China(Grant No.200802861011);the Teaching and Research Foundation for Excellent Young Teachers of Southeast University.

摘　　要：This paper addresses the problem of condition assessment of bridge expansion joints using long-term measurement data under changing environmental conditions.The effects of temperature,traffic loading and wind on the expansion joint displacements are analyzed and interpreted,which reveal that measured displacements are observed to increase with an increase in temperature and to decrease with increased traffic loading,while the correlation between displacement and wind speed is very weak.Two regression models are developed to simulate the varying displacements under the changes in temperature and traffic loadings.Based on these models,the effects of the environmental conditions are removed to obtain the normalized displacement.Statistical process control using mean value control charts is further used to detect damage to the bridge expansion joints.The results reveal that the proposed method had a good capability for detecting the damage-induced 1.0%variances of the annual changes in the expansion joint displacements.

关 键 词：structural health monitoring DISPLACEMENT expansion joint temperature effect wind effect traffic loading statistical process control suspension bridge 

分 类 号：TN9[电子电信—信息与通信工程]