斜拉桥结构健康监测系统的设计与实现(II):系统实现

Design and implementation of health monitoring systems for cable-stayed bridges(II): implementations

采用“斜拉桥结构健康监测系统的设计与实现(I)-系统设计”中所建立的设计方法,分别为两座大型斜拉桥设计并实现长期实时健康监测系统和定期实时健康监测系统:滨州黄河公路大桥长期实时健康监测系统和哈尔滨松花江大桥定期实时健康监测系统。研究两座大型斜拉桥结构健康监测系统的总体设计方案、子系统的设计方案和硬软件设备及其实现、系统的集成技术及其实现方法;分析两套健康监测系统在成桥试验和运营中监测的桥梁结构荷载和静动力反应。结果表明,两座斜拉桥结构健康监测系统均能协调运行,实现了预期设计功能;系统中布设的光纤光栅应变和温度传感器测试精度高、耐久性好、抗电磁干扰性能强;系统中建立的远程无线微波通讯系统可以实时传输和再现监测信号。

Two structural health monitoring （SHM） systems for the Shandong Binzhou Yellow River Highway Bridge and Harbin Songhua River Bridge, respectively were designed and implemented by employing the design method proposed by the authors, presented in the proceeding article of two-paper in sequel. The system for the first case ran in real-time and the data were saved and downloaded at a website at any instant. While for the later ease the system ran at regular intervals and only the database was permitted to be visited at the website. The frameworks of the health monitoring systems were first determined. Then, the type, location and performance of the sensors, the data acquisition module, wireless communication system, database, and system integration techniques were studied, determined and implemented. These systems have been running and collecting data since the bridges were open to traffic. The results indicated that the performance of the two systems has achieved the desired objectives. In addition, the performance of the optical fiber Bragg-grating sensors measuring the applied strain and temperature for long-term monitoring purpose even under -50℃ and 50℃ ambient temperatures was verified. The capacity of the microwave wireless communication system transmitting and retrieving data in real-time for the health monitoring system was also investigated.