基于荷载试验的大跨径悬索桥监测系统验证分析

Verification Analysis of Monitoring System for Long-span Suspension Bridge based on Load Test

结构健康监测系统是对运营期的桥梁进行全寿命周期的监测,实时掌握大桥的运营安全状态。荷载试验是检验施工质量和桥梁的受力状态。以某大跨径悬索桥荷载试验为例,结合荷载试验期间的健康监测数据,对荷载试验期间大桥的挠度、应变、主梁振动等试验数据进行验证分析,评估成桥状态的受力特性。结果表明:在静载试验加载和卸载情况下监测数据反映主桥一直保持为弹性工作状态,结构刚度满足设计要求;在动载试验中,监测系统数据反映桥梁结构平稳,结构动力特性良好。通过对监测系统数据进行深度挖掘,有效记录大桥成桥后的初始状态,可为其他大跨径悬索桥的智能化管养提供借鉴和参考。

The structural health monitoring system is to monitor the whole life cycle of the bridge during the operation period,and to grasp the operational safety status of the bridge in real time.The load test is to inspect the construction quality and the stress state of the bridge.In this paper,taking the load test of a long-span suspension bridge as an example,combined with the health monitoring data during the load test,the deflection,strain,main beam vibration and other test data of the bridge during the load test are verified and analyzed,and the stress characteristics of the bridge state are evaluated.The results show that the monitoring data reflect that the main bridge has remained in an elastic working state under the loading and unloading conditions of the static load test,and the structural stiffness meets the design requirements.In the dynamic load test,the data of the monitoring system reflect that the bridge structure is stable and the dynamic characteristics of the structure are good.Through in-depth data exploration of the monitoring system,the initial state of the bridge after completion is effectively recorded,which can provide reference for the intelligent management and maintenance of other long-span suspension bridges.