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Optical Fiber Grating Sensor for force Measurement of Anchor cable

Wuhan University Journal of Natural Sciences 2006年第3期11卷 662-666页

作者： JIANG Desheng FU Jinghua LIU Shengchun SUI Lingfeng FU Rong Fiber Optical Sensing Technology Research Center Wuhan University of Technology Wuhan 430070 Hubei China Hubei Jianke Structural Strengthening Corporation Limited Wuhan 430071 Hubei China Wenhua College Huazhong University of Science and Technology Wuhan 430074 Hubei China

The development of the sensor suitable for measuring large load stress to the anchor cable becomes an important task in bridge construction and maintenance. Therefore, a new type of optical fiber sensor was developed in the laboratory - optical fiber grating sensor for force measurement of anchor cable （OFBFMAC）. No similar report about this kind of sensor has been found up to now in China and other countries. This sensor is proved to be an effective way of monitoring in processes of anchor cable installation, cable cutting, cable force regulation, etc, with the accurate and repeatable measuring results. Its successful application in the tie bar cable force safety monitoring for Wuhan Qingchuan bridge is a new exploration of optical fiber grating sensing technology in bridge tie bar monitoring system.

关键词： new type of optical fiber sensor anchor cable tie bar cable force health condition OFBFMAC

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Damage Detection for Long-Span cable-Stayed Bridge

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Journal of Southwest Jiaotong University(English Edition) 2006年第1期14卷 63-72页

作者：赵玲李爱群缪长青汪永兰 College of Civil Engineering Southeast University Nanjing 210096 China College of Architectural Science and Engineering Yangzhou University Yangzhou 225009 China College of Civil Engineering Southeast University Nanjing 210096 China

Based on the updated finite-element model of a cable-stayed bridge, this study investigates the technique of identifying damage existing in cable or girder by means of numerical simulation. The modal analysis is performed to identify the changes in modal fiequencies and curvatures caused by damage, and the static analysis is executed to detect the influence of damage on cable force. The results indicate a relatively significant decrease in frequencies of lower vertical bending modes due to the damage in cable and little change of frequencies due to damage in girder. Different sensitivities to the location of damaged cable are observed from the fiequency changes of different bending modes, which can be used to initially locate the damaged cable. The damage in either cable or girder can be further localized by the most significant change in curvature of girder. The damage occurred in a cable produces a remarkable change in force of nearby cables, whereas the damage in girder brings little change of cable forces. In addition, a pragmatic approach for localizing the damage in girder or cable is proposed based on a comprehensive utilization of the changes in frequency of vertical bending modes, modal curvature of girder, and force in cables.

关键词： cable-stayed bridge cable damage Girder damage Modal curvature cable force

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