Quantitative analysis of diaphragm plate caused by pedestal void of assembled box girder

Abstract

In this paper, ANSYS finite element software is used to study the influence of pedestal void on the diaphragm force of prestressed prefabricated box girder bridge. Three different working conditions of no support void, side span support void and middle span support void were simulated respectively, and then the principal tensile stress and vertical deflection of each diaphragm key point were studied under different working conditions. The results show that the support void has almost no effect on the main tensile stress and vertical deformation of the diaphragm in the mid-span, but has a significant effect on the diaphragm at the end of the beam. The influence of the middle span support void on the main tensile stress of the diaphragm is larger than the opposite span support void. The effect of side-span bearing void on the vertical deflection of diaphragm is greater than that of mid-span bearing void. The void of the support will lead to the uneven force of the whole structure and finally affect the stability of the whole structure.