空间组合桁梁桥受力特点及剪力滞分析

Mechanical Characteristics & Shear Lag Analysis of Space Composite Truss Bridge

桁架组合梁桥包括复合桁梁桥和组合桁梁桥。组合桁梁桥是指将一般钢桁梁的上、下弦和混凝土桥面板结合在一起共同受力的结构。通过对奉干公路浦南运河空间组合桁梁桥的有限元计算,分析了空间组合桁梁桥的传力特点,通过桥面板应力分布得到有效宽度,揭示了腹杆轴力与桥面板剪力滞现象之间的关系,为组合桁梁桥的设计提供参考。

Truss composite girder bridge includes hybrid truss girder bridge and composite truss girder bridge,while composite truss girder bridge refers to structure which using upper and lower chord of steel truss girder and concrete deck to resist loading together.A 3D finite element model for a space composite truss girder bridge of Fenggan Highway Punan Canal is established to analyze the mechanical characteristics of the bridge.Effective widths are calculated through deck stress distribution,and relationship between axial force of web members and deck's shear lag phenomenon is revealed.This paper will provide reference for the design of such composite truss girder bridge.