通过对预应力混凝土薄壁箱梁剪力滞效应的理论分析,重点阐述了有限元法理论在剪力滞分析中应用,介绍了规范考虑剪力滞效应的有效分布宽度方法.利用一实际混凝土箱梁桥进行有限元建模计算,对于箱梁在受到不同荷载作用时表现的剪力滞效应进行了分析,指出箱梁在对称荷载作用情况下仍然表现出剪力滞效应.通过箱梁有限元模型计算指出了初等梁理论的适用范围,可为箱型截面桥梁设计提供借鉴意义.%In this article, through analyzing thin-walled box girder of prestressed concrete shear lag effect in theory,it was focused on the theory of finite element analysis of shear lag in the application. And briefly describes the specifications for effective width considering of shear lag effect. By analyzing the actual concrete box girder bridge with FEM, the stress and deflection of box under different load conditions were calculated. Analyzing shear lag effect of the box in different loads conditions, it was pointed that box still showed shear lag effect in the case of symmetrical load condition. For the effective distribution width about the top and bottom plate of the box has been studied, it was indicated that shear lag effect can be considered with the effective distribution width. By calculating stress and deflection of the box with FEM, it was identified that the application of general beam theory. This article could provide reference for design of the box bridge.
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