低影响交通情况下简支梁桥快速荷载试验评定方法研究  

Research on Rapid Load Test Evaluation Method of Simply-supported Beam Bridge under Low Impact Traffic

作　　者：王晓佳 张凯 张澎涛 WANG Xiao-jia;ZHANG Kai;ZHANG Peng-tao(Shanghai Municipal Highway Engineering Inspection Co.Ltd.,Shanghai 200000,China;Shanghai Municipal Planning and Design Institute Co.Ltd.,Shanghai 200000,China)

机构地区：[1]上海市市政公路工程检测有限公司,上海市200000 [2]上海市市政规划设计研究院有限公司,上海市200000

出　　处：《公路》2022年第7期190-195,共6页Highway

基　　金：上海市2019年度“科技创新行动计划”社会发展领域项目,项目编号19DZ1203002。

摘　　要：当前,对运营桥梁的承载能力评估最直接、可靠的手段是桥梁荷载试验。荷载试验需要在交通封闭、温度稳定、结构温差较小以及尽可能避免其他影响试验加载效应的条件下实施,桥梁荷载试验费时费力、影响交通,实施成本较高。提出一种在不中断交通条件下以轻载车辆低速通过桥梁,通过测试车辆低速通过桥梁的挠度或应变反算出桥梁跨中位移或应变的“影响线值”的方法。对桥梁进行静载试验,根据反算出的“影响线值”计算静载试验实际加载车引起的位移或应变的理论值,对比静载试验的实测值和按影响线值计算的理论值,对桥梁的承载力进行评估;以此低速动载试验结果为依据,在不中断交通情况下采用标准车低速通过待测试桥梁,实测挠度和应变并与此试验结果对比,对桥梁进行承载能力评定。实桥试验结果表明,该评定方法有效可靠,不中断交通情况下也可对桥梁承载能力进行评定,具有重要的社会意义和经济价值。At present, the most direct and reliable method to evaluate the bearing capacity of operating bridges is bridge load test. The load test needs to avoid the factors affecting the testing load effect as much as possible under the conditions of closed traffic, stable temperature, small structural temperature difference and so on. Bridge load test is time-consuming and laborious, affects traffic and has high social cost. In this paper, a method of using lightweight vehicles is presented to cross the bridge at low speed without interrupting traffic, by testing the deflection or strain of the lightweight standard vehicle passing through the bridge at low speed, the “influence line value” of the displacement or strain in the middle of the bridge is inversely calculated. The static load test is carried out on the bridge, the theoretical value of displacement or strain caused by actual loading vehicle in static load test is calculated according to the inverse calculated “influence line value”. The bearing capacity of the bridge is evaluated by comparing the measured value of the static load test with the theoretical value calculated according to the influence line value. Based on the results of this low-speed dynamic load test, under the condition of uninterrupted traffic, the standard vehicle is used to pass through the bridge at low speed, and the measured deflection and strain results of the later test are compared with the results to evaluate the bearing capacity of the bridge. The real bridge test shows that the evaluation method is effective and reliable, and the bearing capacity of the bridge can be evaluated without interrupting the traffic, which has important social significance and economic value.

关 键 词：简支梁桥 荷载试验 影响线 不中断交通 承载能力评定 方法研究 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]