中小跨径混凝土连续梁桥健康监测方案设计

Design of Health Monitoring Scheme for Medium and Small Span Concrete Continuous Beam Bridge

针对中小跨径混凝土连续梁桥基数大、事故多而健康监测研究尚且不成熟的问题,基于危险截面理论、有理三次样条函数结合有限元仿真分析与实桥概况在武汉市一座三跨预应力混凝土连续梁桥上布置了相应的健康监测测点,形成了一套经济、适用且较为完备的中小跨径混凝土连续梁桥的健康监测方案,并以温度和应变数据为例对监测结果进行了分析:温度数据的最值为-1.1℃、12.5℃,处于正常的温度变化范围之内,且测点温度随着大气温度的变化而变化,说明数据是可靠的;应变数据的变化范围为-30.2~198.3uε,整体小于预警值(-249.2uε、273.9uε),依据适度量化模型对其进行评估总体得分为93.4分,说明桥梁的运营状态良好。研究结果表明该方案切实可行,可为同类桥梁健康监测系统的研究提供参考。

Aiming at the problem of large base number of small and medium-span concrete continuous beam bridges,many accidents and immature health monitoring research,a three-span prestressed bridge based on the theory of dangerous section,rational cubic spline function combined with finite element simulation analysis and actual bridge overview in Wuhan Corresponding health monitoring points are arranged on the concrete continuous beam bridge,forming a set of economical,applicable and relatively complete health monitoring program for small and medium-span concrete continuous beam bridges,and the monitoring results are carried out using temperature and strain data as examples.Analysis:The maximum value of the temperature data is-1.1℃and 12.5℃,which are within the normal temperature range,and the temperature of the measuring point changes with the change of the atmospheric temperature,indicating that the data is reliable;the change range of the strain data is-30.2~198.3uε,which is generally less than the warning value(-249.2uε,273.9uε).According to the appropriate quantification model,the overall score is 93.4 points,indicating that the bridge is in good operating condition.The research results show that the scheme is feasible and can provide a reference for the research of similar bridge health monitoring systems.