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为深入了解桁腹式组合桁梁桥节点区域的剪力滞效应,通过建立简支桁腹式组合桁梁桥ABAQUS有限元模型,以梁桥承受竖向荷载时的节点为观察对象,在宽度和长度两个维度上量化分析桥面板的纵向正应力、剪力滞系数和有效宽度的规律。模拟结果显示,桥面板同时存在剪力滞效应和负剪力滞效应,在节点区域效应最严重,各节间中点区域剪力滞效应较低。按规范计算的简支箱梁桥有效宽度与桁腹式组合桁梁桥上有效宽度最大值相当,但与最小有效宽度差异较大。
In order to understand deeply the shear lag effect in the joint region of girder-to-girder bridge, the ABAQUS finite element model of simply supported girder-to-girder combined truss girder bridge was established. Taking the girder subjected to vertical load as the observation object, And length of the two dimensions quantitative analysis of the bridge deck longitudinal normal stress, shear lag coefficient and the effective width of the law. The simulation results show that the deck slab has both shear lag effect and negative shear lag effect, and the effect is the most serious in the node area. The shear lag effect in the midpoint of each node is low. The effective width of the simply supported box girder bridge calculated according to the standard is equivalent to the maximum effective width of the girder bridge of the truss-girder composite girder, but differs from the minimum effective width.