加劲桁架悬索桥的主梁挠曲扭转刚度分析

吴新元，马如进，陈艾荣，金玉泉

（同济大学桥梁工程系 土木工程防灾国家重点实验室）

摘要：板桁组合加劲梁由于其优良的空气动力稳定性在大跨悬索桥中经常被采用。本文通过ANSYS有限元程序建立不同长度的节段有限元模型，

施加不同方式的等效荷载，然后由有限元模型计算的变形来反算梁体的抗弯和抗扭刚度。从而为悬索桥的动力分析建模和风洞试验模型简化提

供依据。最后以某悬索桥为例，对直接采用板桁组合梁和等代梁两种方式建立的模型进行了动力结果比较。

关键词：板桁组合梁；ANSYS有限元程序；节段有限元模型；挠曲刚度；扭转刚度

Bending and Torsional Stiffness Analysis on Main Girder of

Suspension Bridge with Stiffend Truss

WU Xin-yuan,  MA Ru-jin ,  CHEN Ai-rong, et al 

  Abstract: Plate-truss composite girder was usually used in suspension bridges because of their good aeroelastic stability. Establishing section models with different length by ANSYS program,and exerting equivalent loads by different ways, then the bending and torsional stiffness were calculated by the deformation of the finite-element model.It provides foundation for the model simplification of wind tunnel experiment and the dynamaic analysis of suspension bridge.at last,make the comparison for model dynamic result between plate-truss girder and equivalent box girder through a suspension bridge.   

Key words: plate-truss composite structures; ANSYS finite element program;section model ; bending stiffness;torsional stiffness