钢桁腹组合梁剪力滞效应的有限元分析

Finite Element Analysis on Shear Lag Effect in Composite Girder with Steel Truss Webs

为了研究钢桁腹组合梁剪力滞效应,利用通用有限元软件Ansys建立三维实体模型,并建立与之对应的波形钢腹板组合梁的有限元模型,进行对比分析。通过分别施加集中荷载与均布荷载,研究钢桁腹组合梁在不同荷载工况下的剪力滞效应,以及截面上剪力滞系数的分布情况。结果表明:钢桁腹组合梁在集中荷载与均布荷载作用下,顶底板存在明显的剪力滞效应;钢桁腹梁组合梁在集中荷载作用下的剪力滞效应比均布荷载下的要明显;在相同荷载作用下,钢桁腹组合梁顶底板正应力小于波形钢腹板组合梁;在不同荷载工况作用下,2种组合梁顶底板剪力滞系数横向分布大致相同。

In order to study the shear lag effect of composite girder with steel truss webs, the 3D finite element model is established with general finite element software Ansys, and a corresponding finite element model of composite girder with corrugated steel webs is established to perform a comparative analysis. Through applying concentrated load and uniform load, the shear lag effect of composite girder with steel truss webs is researched, and the shear lag coefficient distribution along cross-section is researched. The results show that （ 1 ） under concentrated load and uniform load, the shear lag effect in top and bottom flange plates of composite girder with steel truss webs is obvious; （2） under concentrated load, the shear lag effect of composite girder with steel truss webs is more obvious than that under uniform load ; （3） under the same load case, the normal stresses of top and bottom flange plates in composite girder with steel truss webs are smaller