| Abstract:Combined by many bars and with a complex construction and force state, the joints of double-layer steel truss bridges mainly use the integral connection types. In this paper, the general Finite Element Method(FEM) software ANSYS is used to analyze the refined inner forces of an all-welded integral joint in a certain steel truss bridge. It’s also used to numerically simulate the welding procedure of some joints and analyze the distribution of the temperature fields and residual stresses. The main work includes:(1) The3-D finite element model is established to calculating the stress state of the whole structure. The model of two connection types---all-welded type and bolt-connected type which combine the integral joints and the adjacent members is also established to find their different performance of integral joints.(2) The local finite element model of integral joint in ANSYS software is built to research the different stress distribution status of nodes gusset plates and bolt splice plates in joints, which finely simulate the outer force system in different working conditions to ensure that the loading conditions between the joint and whole structure are identical. Then, the design details of some parts of the joint are optimized.(3) The welding residual stress of the integral joint is analyzed with ANSYS software. Besides, numerical-simulation method is applied to simulate the welding process of one fourth of middle truss joint in steel truss. Firstly, internal heat generation loading method is used to simulate the movement of the welding heat source. Then, indirect coupling method and birth-death element method are used to calculate and simulate the extract temperature and stress field of the welding process. Finally, the law of the joint’s welding heat stress and residual stress is summarized to provide some reference for the same future designs. |
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