利用GPS实现大跨桥梁的实时安全监测

On-line safety minitoring of long span bridge by GPS

由于悬索桥跨度大.台风、地震、车载和温度变化对桥梁变形影响很大,对大桥实时监测,获取桥梁在上述环境下的工作状况,验证结构的抗风、抗震分析的特征参数,成为大桥安全性研究的重大课题。为连续实时监测大跨桥梁在环境如台风、地震、车载和温度作用下的位移变形,通过比较几种桥梁传统的位移测量方法,提出利用GPS技术实时监测桥梁位移和转角的新方法。该系统能精确记录大桥在温度变化、车载、风荷载下桥梁变形的位移和模态特性,这些数据在评估大桥安全性和交通安全方面有着重要作用。

In order to on-line monitor the long-span bridges displacement caused by environment such as typhoon, seismic activity, traffic load and temperature, a new on-line monitoring technique based on GPS is developed by comparing server conventional bridge displacement measure methods. This technique could record the bridge displacement and modal characteristic in typhoon, seismic activity, traffic load and different temperature, which is ver important for evaluation bridge safety.