下白石大桥健康监测系统的设计与研究  

Design and Study of Structural Health Monitoring System of Xiabaishi Bridge

作　　者：宗周红[1] 孙建林[2,3] 徐立群 夏樟华[2] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]福州大学土木工程学院,福建福州350108 [3]福建省高速公路建设总指挥部,福建福州350001 [4]福建省交通科学技术研究所,福建福州350004

出　　处：《铁道学报》2009年第5期65-71,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(50778044);福建省高等学校新世纪优秀人才支持计划项目(TW2006-29);福州大学科技发展基金项目(2006-XQ-29)

摘　　要：以跨径布置为145 m+2×260 m+145 m的下白石连续刚构桥为工程背景,介绍该桥健康监测系统的总体目标、监测内容、仪器选择、测点布置、信号采集与传输和安全报警等。采集系统实现静力和动力数据综合采集与控制,包括加速度、动位移等动态特征及应变、温度、支座位移和线形等静态信息。星型传输系统可保证各个采集子站的独立性和抗干扰能力,并采用多模光纤和电话网络实现数据远距离传输、远程监控和现场无人值守。该健康监测系统工作正常、性能稳定、监测数据可信。通过对监测数据的初步分析,表明下白石大桥没有异常发生,目前桥梁基本处于安全状态。A prestressed continuous rigid frame bridge with 145 m ＋2 × 260 m＋145 m spans, the Xiabaishi Bridge, is selected as the sample of the required engineering background. Aspects of its health monitoring system are described, including the overall monitoring objective, measurement contents, monitoring instrument selection, monitoring points layout, data acquisition and long-distance transmission and safety alarming system and so on. Static and dynamic data acquisition is realized, namely, vibration characters such as acceleration and dynamic displacement and static information such as strain, temperature, displacement of supports and bridge line-type are syncretized and controlled. The star transmission structures syncretizeed in the monitoring system can make sure that each acquisition substation is independent and has strong anti-interference capability. The multi-molds optical fiber net and telephone net are used to carry out unattended long-distance transmission and long-distance supervisory control. The on-line monitoring system of the Xiabaishi Bridge has worked very well since it was opened. It demonstrates normal operation and stable performance and provides accurate and reliable monitoring data. The initial analysis indicates that no abnormality occur with the Xiabaishi Bridge, and the Bridge is safe at present.

关 键 词：大跨度连续刚构桥 健康监测系统 传感器 数据采集和传输 安全预警 

分 类 号：U446[建筑科学—桥梁与隧道工程]