铁道科学与工程学报2018，Vol.15Issue(2)：427-434,8.
S型曲线钢箱梁桥空间受力特性研究
Research on spatial performance of S-curve steel box girder bridge
摘要
Abstract
To analyze the spatial mechanical performance and shear lag effect in both longitudinal and transversal direction, a three-span S-curve steel box girder bridge was regarded as research object. The 7-DOF beam element of Midas Civil considering warping displacement and Shell181 element of ANSYS were used for the whole bridge spatial simulation based on FEM theory. By detailedly studing the structure displacement, cross section stress, end reaction, and natural vibration characteristics under different loads, the most unfavorable situation of structure and its stress distribution rule were discovered and summarized. By comparing the calculation results of Midas and ANSYS, it can be known that the shell element model is more accurate than the beam element model when simulating the coupled effect of bending and torsion. In the actual design of structures, the shell element should be used for calculating as far as possible because its result can be more safety. In order to further study the shear lag effect, the ANSYS results of some key cross sections of steel box girder bridge were extracted and the change rules of shear lag coefficient in both longitudinal and transversal direction of the bridge were obtained, which can provide reference for design and calculation of similar bridges in the future.关键词
S型曲线/钢箱梁桥/板壳单元/弯扭耦合/剪力滞效应Key words
S-curve/steel box girder bridge/shell element/bending-torsion coupling/shear lag effect分类
建筑与水利引用本文复制引用
刘建威,于鹏,李德建..S型曲线钢箱梁桥空间受力特性研究[J].铁道科学与工程学报,2018,15(2):427-434,8.基金项目
国家自然科学基金资助项目(51378504) （51378504）
