基于GPS技术的大跨桥梁实时动态监测系统

GPS-based Real-time Dynamic Monitoring System for Long Span Bridge

大跨度桥梁,特别是主梁为钢结构的跨江大桥,其变形受台风、地震、车辆以及温度变化等因素的影响很大,对其进行实时动态的变形监测,能够获取桥梁在各种荷载作用下的变形数据,了解其工作状况,进一步掌握其变化规律。以江阴大桥结构健康监测系统中的GPS桥形在线监测系统为例,详细介绍了GPS监测系统的组成和数据分析,实践证明,该系统能够精确地记录大桥在车辆、风荷载以及温度变化情况下结构主梁和主塔的位移特征,从而为验证结构抗风、抗震设计和大桥的日常安全维护提供可靠依据。

The deformation of long span bridge,especially the long span bridge with steel girder,is influenced by typhoon, earthquake, change of traffic or temperature, etc. The real deformation monitoring is useful for structural deformation data acquiring under various load cases and bridge conditions analyzing. Taking the GPS-based on-line monitoring system of Jiangyin bridge structural health monitoring system as an example, this paper introduces the system composition and data analysis of GPS monitoning system. The practice show that this system is able to acquire the deformation history for both girder and tower under the actions of wind, vehicle and temperature change, thus, this system play very important roles in checking design theory and seismic design supplying information for daily maintenance, and further evaluating bridge＇s working conditions.