拱梁组合的钢结构人行天桥静载试验研究及承载力评定

Static Load Test Study and Bearing Capacity Evaluation of Pedestrian Bridge—Arch-beam Composite Steel Bridge

以太原市滨河西路一座拱梁组合搭建而成的人行天桥(钢桥)为例,从安全运营的角度出发,对其进行了静载试验及承载能力评定,以判定该桥的实际工作性能。采用MIDAS有限元软件对天桥结构进行模拟计算,确定出静载试验方案,选择混凝土试块加载方式,现场采用建筑方木进行支垫。静载试验表明,在试验荷载作用下,结构各测点应力与位移校验系数均远小于0.95,人行天桥结构的承载能力满足标准荷载4.05 kN/m^2作用下的正常使用要求,结构具有一定的安全与刚度储备。试验结果为该桥日后运营阶段的管养提供技术依据,同时对类似工程的设计、施工与检测提供有益参考。

By taking a predestrian bridge(steel bridge)built by the combination of arch-beam in Binhe West Road,Taiyuan as an example,in order to ensure the safe operation of the bridge,the static load test and bearing capacity evaluation were carried out to determine its actual working state.The finite element simulation calculation was carried out by using MIDAS software.The static load test scheme was determined:the loading method of the concrete test block and the square wood support method on the site were selected.The static load test shows that under the test load,the stress and displacement check coefficients of each measuring point were far less than 0.95.The bearing capacity of the pedestrian bridge meets the normal use requirements under the standard load of 4.05 kN/m^2,and the structure has moderate safety and rigidity reserve.The test results provide technical basis for the management of the bridge in the future operation stage,and provide useful reference for the design,construction and testing of similar projects.