城市轨道高架桥动力响应分析与监测

桥梁监测系统通过实时监测各关键性能的技术指标,为桥梁的安全度评估及桥梁的养护维修提供科学依据。通过数值模拟与现场监测数据相结合的方式研究列车对桥梁的动力加载效应。采用ANSYS软件建立桥梁有限元模型,将城市轨道交通列车简化为一系列移动集中荷载,计算列车匀速行驶作用下桥梁的振动响应,同时利用桥梁监控系统采集的实测数据对计算结果进行验证。得出结论如下:通过监测数据验证数值模拟结果的正确性;列车移动通过时桥梁跨中位移均在合理范围,现阶段桥梁处于较好工作状态;列车运行速度对桥梁跨中位移极值有明显影响。

Monitoring and Calculation of Urban Rail Transit Bridge Structure Dynamic Response under Moving Train Loads

The technical indexes of key performance of the bridge are measured by the monitoring system,which provides a reliable basis for bridge evaluation and maintenance. The dynamic responses of bridge are studied with numerical simulation and field monitoring while the train is running. ANSYS is used to establish the finite element model of bridge,and the moving train is simplified to a series of moving loads. The measured data obtained from the bridge monitoring system are used to verify the calculation. The results show that the rationality of the numerical simulation is verified by the monitoring data; the mid-span displacement of the bridge is in a reasonable range when the train is passing through,and the bridge is now in good working condition; train running speed imposes obvious impact on the maximum displacement of the bridge structure.