基于健康监测的武汉军山长江大桥重车过桥响应分析

发布时间：2018-04-14 00:02

本文选题：武汉军山长江大桥 + 重车　；参考：《桥梁建设》2014年06期

【摘要】：武汉军山长江大桥为主跨460m双塔双索面钢箱梁斜拉桥,2011年安装了健康监测系统。该桥通行多为重车,并时有超载现象出现。为了解重车过桥结构性能,评判重载对结构的影响程度,基于该桥上安装的健康监测系统,对2辆载重178t的重车先后通过该桥的主梁位移、桥塔偏位、主梁应力、索力进行了全程采集,并与有限元计算值、阈值进行对比分析。分析结果表明:桥梁空载状态和卸载状态下桥塔残余变形以及主梁残余变形和残余应力均较小,卸载后斜拉索振动幅值恢复正常,结构处于弹性状态,性能良好;重车过桥结构响应均在活载计算包络曲线内,重载对结构的影响很小,结构无损伤发生;结构响应实测值与计算值吻合较好。
[Abstract]:Wuhan Junshan Yangtze River Bridge is a 460m steel box girder cable-stayed bridge with two towers and two cables, and a health monitoring system was installed in 2011.The bridge traffic for heavy vehicles, and sometimes overloading phenomenon.In order to understand the structure performance of heavy truck crossing bridge and judge the influence degree of heavy load on structure, based on the health monitoring system installed on the bridge, the displacement of main beam, the deflection of bridge tower and the stress of main beam of two heavy cars with 178t load passing through the bridge have been studied.The cable force was collected in the whole process and compared with the finite element calculation value and the threshold value.The analysis results show that the residual deformation of the tower and the residual deformation and residual stress of the main beam are smaller under the condition of no load and unloading, the amplitude of vibration of the stayed cable returns to normal after unloading, the structure is in the elastic state and the performance is good.The structural response of the heavy truck crossing bridge is in the envelope curve of the calculation of live load, the influence of heavy load on the structure is very little, the structure has no damage, and the measured value of the structure response is in good agreement with the calculated value.
【作者单位】：中铁大桥局集团桥科院有限公司;桥梁结构安全与健康湖北省重点实验室;
【分类号】：U446.2

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