山区长大桥结构监测系统设计及应用研究

Research on Design and Application of Structural Monitoring System for Long Bridges in Mountainous Areas

针对山区长大桥众多、抗灾能力有限、抢险频繁、灾害损失大的问题,提出了采用无线传感和光纤环网组合的方式构建山区长大桥结构监测系统,并通过基于触发采样和报警验证的预警机制实时动态掌握桥梁的运行状况、防范重大安全风险。应用于某山区长大桥的实时监测数据表明:监测数据与荷载试验及数值模拟结果基本保持一致,并完整呈现了荷载试验加卸载过程结构的受力变形,弥补了传统人工检测的不足,对山区长大桥预防性管养具有一定的现实意义。

In view of the problems of long bridges in mountainous areas,such as limited disaster resistance,frequent rescue and large disaster losses,the structural monitoring system for the long bridges in mountainous areas is put forward by using the combination of wireless sensing and optical fiber ring network,and the operation status of bridges is dynamically mastered and major safety risks are prevented through the early warning mechanism based on trigger sampling and alarm verification. The real-time monitoring data applied to a long bridge in a mountainous area shows that: the monitoring data is basically consistent with the load test and numerical simulation results,and completely presents the stress deformation of the structure during the loading and unloading process of the load test,which makes up for the deficiency of the traditional manual detection,and has a certain practical significance for the preventive management and maintenance of the long bridges in mountainous areas.