基于GPS的南浦大桥动响应监测及刚度损伤预估

为了建立实测动响应与大跨径桥梁健康状况的紧密联系.建立了基于GPS的南浦大跨桥梁结构健康监测系统,提出了基于实测动挠度的整桥刚度损伤预估方法。首先根据桥梁结构仿真计算结果及GPS系统的监测特点,建立了桥梁动态线形变化的实时监测系统;然后根据监测数据分析了桥梁运营过程中的结构动响应分布规律,最后通过有限元迭代的方法,进行了桥梁整体刚度损伤的预估。分析结果表明,提出的南浦大桥GPS监测系统能有效地对桥梁进行关键受力部位的实时在线监测,评估方法建立了实测数据与结构健康状况的紧密联系,为实桥局部损伤定位及维护提供了理论基础。

Dynamic Response Monitoring and Stiffness Degradation Assessment for Nanpu Bridge Based on GPS

In order to establish the relationship between measured dynamic response and health status of long span bridges, a health monitoring system and integrated condition assessment method for Nanpu Bridge based on GPS were presented in this paper. A real time monitoring sys-tem was set up according to the calculation results and the characteristics of GPS firstly. The distribution law of dynamic response was ana-lyzed. At last, the whole stiffness degradation assessment of Nanpu Bridge was done by using direct iterative algorithm of the finite element. Analysis results show that the real-time on-line monitoring can be carried out through the proposed monitoring system effectively. The meas-ured dynamic response of the bridge is well corresponded with the health condition of that, and the stiffness degradation assessment can pro-vide theoretical basis for the locating of local damage and maintenance of the bridge.