MIDAS/Civil分体式小箱梁湿接缝模拟方法

Separated Small Box Beam Wet Joint Simulating Method

以由3片分体式组合箱梁组成的30 m三跨连续梁桥为研究对象,利用大型有限元软件MIDAS/Civil,建立了3种湿接缝模拟方法的梁单元模型,分别为湿接缝换算法、刚接梁法、横向虚拟梁法。对比分析3种计算模型在3种荷载工况下各片箱梁的边跨跨中与中跨跨中位移解。计算结果表明:实体模型计算结果准确但建模复杂,与之相比,湿接缝换算法、刚接梁法、横向虚拟梁法模型建模较简单,最大误差为6.4%;湿接缝换算法、刚接梁法、横向虚拟梁法是分体式组合小箱梁桥的较合适建模方法,可用于分体式组合小箱梁桥结构分析。

As the study object of 30-m three-span continuous bean bridge composed of three separated combined box beams, the large finite element software MIDAS/Civil is used to set up three wet joint simulating methods of beam element models, which are the wet joint conversion method, rigid connected beam method and horizontal fictitious beam method. The article compares and analyzes the displacements of three calculation models in the middle of side span and the middle of the central span under three loading conditions. The calculation results show that the calculation of solid model is correct, and but the modeling is complicated. After comparison, the wet joint conversion method, rigid connected beam method and horizontal fictitious beam method to set up the models are simpler. The maximum error is 6.4%. The wet joint conversion method, rigid connected beam method and horizontal fictitious beam method are more suitably to set up the models for the separated combined small box beam bridge, which can be used for the structural analysis of the separated combined small box beam bridge.