连续刚构箱梁桥的剪力滞效应分析

Shear-lag Effects Analysis of Continuous Rigid-frame Box Girder Bridge

根据一座单箱三室连续刚构组合桥梁,考虑桩-土相互作用分别建立了变截面三维梁单元和三维实体、板壳单元组合两种有限元模型,分析了桥梁在均布荷载和集中荷载作用下的剪力滞效应,并讨论了两种计算模型对动力特性的影响。结果表明,在均布荷载与集中荷载作用下箱梁的剪力滞效应明显不同,对于地震时程反应分析而言,采用变截面三维梁单元模型计算效率较高。所得的分析结果对指导这类桥梁的设计具有重要的工程实用价值。

According to the continuous rigid-frame box girder bridge with single box three rooms, two models were created which considered the interaction between pile and soil： taper section 3D beam element model and, 3D compounding model with solid element and shell element.The shear-lag effects under surface load and concentrated load were analyzed and the impact of these two models on dynamic characteristics discussed.The result shows that, under static loading, the shear effects of boxing beam is notable, and the taper section 3D beam element model which considered the interaction between pile and soil has higher precision and e^ciency.The obtained analysis results have great practical values for the design of related engineering structures.