支座形式对连续折线形斜梁桥力学行为的影响

Effect of Support Forms on Mechanical Behavior of Continuous Zigzag Skew Girder Bridge

摘要:

由于斜向支撑方式不同，斜梁桥与正交梁桥的力学行为存在较大区别。为了研究支座形式对斜梁桥力学行为的影响，以某景观人行天桥为工程背景，采用有限元分析方法对两种支座布置方式下桥梁受恒载和温度荷载作用效应进行研究。研究结果表明：钝角位置支反力更大，锐角位置支反力更小，支座更容易脱空；在温度荷载作用下，斜梁桥支座设置不当，支座承受较大的水平分力，导致主梁和桥墩承受较大横向弯矩。

Abstract:

As the different ways of oblique support, the mechanical behaviors of skew girder bridge and quadrature girder bridge are quite different. In order to study the effect of support forms on the mechanical behavior of skew girder bridge, taking a landscape footbridge as the engineering background, the finite element analysis method is used to study the effects of constant load and temperature load on the bridge under two kinds of support layout. The results show that the support reaction at of the obtuse angle is larger, while at the acute angle is smaller and the supports are more likely to escape. Under the temperature loads, the supports bear the greater horizontal component, which will make the main girder and piers bear a greater lateral bending moment if the supports of skew girder bridge are set improperly.