Refined Finite Element Modeling Methodof Spatial Prestressed Steel Beam

In order to establish a continuous smooth model of spatial prestressed steel beam include both horizontal and vertical curvature, to consider the mechanical effects of spatial prestressed steel beam in finite element analysis, the refined finite element modeling method of spatial prestressed steel beam based on intersecting line was proposed, so the connection mode of the nodes between the spatial prestressed steel beam, duct and concrete girder could be ascertained, and the corresponding modeling procedure was given. The continuous smooth geometric model of spatial prestressed steel beam was established by the intersecting auxiliary bodies. The nodes corresponding relationship between steel beam, duct and concrete girder were achieved by establishing the solid model of duct and performing Boolean operations with main girder. Take the finite element modeling and analysis of the steel-concrete joint section of the Hongshui River bridge in Guizhou as an example, the results show that the maximum local stress of girder decreased by 26.3%, and the stress concentration is improved obviously compared with the traditional constraint equation method, the effective prestress distribution of steel beam is smooth, non-oscillating, the proposed method is more in line with the actual situation.