In order to study the influence of the structural difference between the branch pipes at the joints of the steel truss bridge on the static performance of the structure,the study takes the double-layer simply supported steel truss bridge crossing the railway project of the steam pipe network as the engineering practice.In the design of the double-layer simply supported steel truss bridge,there are some differences in the structural principles between the branch pipes at the joints due to different current specifications.By establishing the overall model of Midas,the differences in the mechanical properties of the members of the structure under the two different node structures of branch separation and branch overlap are compared and analyzed.The results show that the branch pipe separation and branch pipe overlap have great influence on the inclined web member near the fulcrum.When the branch pipe is separated,the maximum stress of the inclined web member at the lower chord node reaches 262 MPa,which is 85 MPa higher than that of the inclined web member when the branch pipe is overlapped.The maximum stress of the inclined web member of the upper chord node reaches 279 MPa,which is 66 MPa larger than that of the inclined web member when the branch pipe is lapped.It does not meet the requirements of the allowable stress of 260 MPa under the action of the main and attached load combination.It is necessary to further improve the bar size of the inclined web member at the fulcrum to meet the requirements of the specification.By comparing the influence of joint structure difference on the static performance of the structure,it is helpful to optimize the design of structural members and provide reference for similar projects in the future.
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