铁路矮塔斜拉桥结构参数敏感性分析

Structural Parameters Sensitivity Analysis of Low-pylon Cable-stayed Railway Bridge

结合喀腊塑克特大桥工程实例,通过采用有限元软件Midas/Civil建立桥梁模型,对主梁混凝土容重、主梁刚度和锚下控制应力等三个结构参数进行敏感性分析,确定影响成桥阶段结构线形和受力状态的主要参数.得到了各参数变化时,成桥阶段下主梁竖向位移、主梁轴力、主梁弯矩和斜拉索索力的相应变化值.同时,计算结果表明:主梁混凝土容重和锚下控制应力为主要影响参数,主梁刚度为次要影响参数.所得结果可为该桥的施工监控提供参考.

In this paper,a bridge model named Kalasuke is established by using the finite element software Midas/Civil for sensitivity analysis of three structural parameters including the bulk density of reinforced concrete of the girder,the stiffness of the girder and the anchor stress under control.And the main parameters which have a great impact on the displacement and stress of the bridge are obtained.The corresponding values of vertical displacement,axial force,bending moment and cable-stayed tension of the girder are obtained when the parameters change.At the same time,the calculation results show that the bulk density of reinforced concrete of the girder and the anchor stress under control are the main influence parameters while the stiffness of the girder is the secondary influence parameter.The results can provide some references for the construction monitoring of the Kalasuke Bridge.