基于梁格法的小半径钢筋混凝土弯箱梁桥空间受力特性分析

Analysis of Spatial Force Characteristics of Small Radius Curved Concrete Box Girder Bridge Based on Grillage Method

摘要: 弯箱梁桥造型优美，能很好地适应和改善道路线型，近年来被广泛地应用于城市桥梁中。但弯箱梁受力复杂，需采用空间分析方法进行分析。本文采用MIDAS/Civil建立全桥梁格模型，分析了小半径弯箱梁结构的空间受力特性，研究了其在荷载作用下的位移以及支座反力特性。通过分析空间模型的计算结果，小半径弯箱梁结构存在明显的弯扭耦合效应，并可引起弯箱梁截面的扭转以及支座反力的不均匀等现象，通过设置支座预偏心可有效消减支座反力不均匀现象。

Abstract: Curved box girder bridge is beautiful, can adapt to and improve the road linearity. In recent years, it has been widely used in urban bridges. But the force of curved box girder bridge is complex, it needs to use the spatial analysis method for analysis. In this paper, the full-bridge grid model was established by MIDAS/Civil based on grillage method, and the spatial force characteristics of the small radius curved box girder were analyzed, and the displacement and bearing reaction characteristics under the load were studied. By analyzing the calculation results of the space model, it can be seen that there are obvious bending and torsional coupling effects of the small radius curved box girder structure, which can cause the torsion of the cross section of the bending box and the nonuniformity of the bearing reaction. However, there is an effective reduction of the nonuniformity of the bearing reaction by bearing eccentricity.