为确保北京地铁线路桥梁结构的安全性，在地铁5号线部分桥梁上安装实时监测系统；对采集到的梁体应力、位移、挠度及裂缝宽度等数据进行分析，确定温度是影响各监测指标的主要因素，温度与各监测指标线性相关，并得到桥梁各评价指标随温度变化的动态预警阈值。通过仿真计算与实测数据对比，验证各监测指标主要受温度影响，受车辆荷载的影响相对较小。提出由单项评估和综合评估两部分组成的桥梁健康状况评价系统框架，并实现系统的开发与调试。该系统目前基本满足北京地铁桥梁监测需求，且具有实时性强、病变部位定位准确等诸多优点。

To ensure the safety of the bridge structure in the Beijing subway line, a real-time monitoring system has been installed on some bridges of subway Line 5. By analyzing the monitored beam stress, displacement, deflection, and crack width, it was found that temperature is the dominant monitoring index. Temperature is linearly related to each monitoring index, and the dynamic early warning threshold of changes of each evaluation index of the bridge is obtained with temperature. Comparison between the simulation calculation and measured data verifies that the evaluation index are mainly affected by changes of temperature and the influence corising from the vehide load is relatively small. A framework and implementation plan for a bridge health evaluation system consisting of a single and comprehensive assessment is proposed, and the system is developed. Currently, it meets the monitoring requirements of Beijing subway bridges and has strong real-time performance and accurate location of lesions, among many other advantages.

U231

国家重点研发计划课题（2016YFB1200402）