鱼腹式钢箱梁横向剪力滞效应分析

Analysis on lateral shear lag effect of fish-bellied steel box girder

为了揭示鱼腹式钢箱梁剪力滞系数分布规律和结构参数对钢箱梁剪力滞效应的影响,通过使用有限元分析软件Midas/civil建立鱼腹式连续钢箱梁空间板壳模型,系统分析了鱼腹式钢箱梁在均布荷载、集中荷载和偏载作用下的剪力滞系数横向分布规律和纵向加劲肋厚度对剪力滞效应的影响.结果表明:在均布荷载、集中荷载和偏载作用下,鱼腹式钢箱梁剪力滞效应明显,不同截面同一位置剪力滞系数不同;通过适当地增加顶板加劲肋的厚度,可以使剪力滞系数明显下降,降低了剪力滞效应.

In order to reveal the distribution rule of shear lag coefficient and the influence of structural parameters on the shear lag effect of fish-bellied steel box girder,a space shell model for the continuous fish-belliedsteel box girder was established by using the finite element analysis software Midas/civil,and the lateral distribution law of shear lag coefficient and the effect of longitudinal stiffener thickness on the shear lag effect of fish-bellied steel box girder under uniform load,concentrated load and partial load were systematically analyzed.The results show that under the influence of uniform load,concentrated load and partial load,the shear lag effect of fish-bellied steel box girder is obvious,and the shear lag coefficient is various at the same location of different sections.Through appropriately increasing the thickness of stiffener on the roof plate,the shear lag coefficient can be significantly reduced,and the shear lag effect diminishes.