Research On Bim Technology Of Upper Chord Joint Of Steel Plate Truss Bridge

With the continuous progress of the information age,the information transmission mode of the project first changes from hand drawing to the two-dimensional graphics mode expressed by electronic digital information technology,and then from the static three-dimensional visualization model to the dynamic three-dimensional visualization model with high integration of information ability.In this process,a lot of new construction engineering concepts have been put forward and implemented,and BIM Technology is the most hot topic nowadays.Bridge engineering is an important branch of civil engineering industry.Nowadays,BIM Technology is mostly reflected in the definition of bridge engineering,and there are few exploration cases for practical engineering.However,for the long-span bearing system of bridge,the stress analysis of its structure is particularly important,and the node analysis is more critical in the stress analysis.Based on the above situation,this paper studies the extended application of BIM model in structural node analysis.In order to explore the application value of BIM technology in structural analysis,the main contents of this paper are as follows:First,according to the structural characteristics of the bridge,two Revit modeling methods are proposed,which are the combination of the family library and dynamo parameterization.The core components such as the upper and lower chord,diagonal web,stiffener,diaphragm are established,which enriches the component library of the steel plate truss bridge.At the same time,the BIM bridge model is built according to the relative spatial position of each component.Secondly,aiming at the defect that some information is easy to be lost when BIM model is imported into finite element software,the lookup plug-in is used to query the C ?? function expression of member end point coordinate,section size and various physical parameters.Through C programming,these parameters are obtained and transformed into APDL language which can be recognized by ANSYS to improve the integrity of information interaction between BIM model and finite element model.After the transformation of the model,the finite element analysis of the whole bridge is carried out to obtain the end stress of each member.Thirdly,for the node analysis part,according to the design principles of truss nodes,several different forms of node construction are established in BIM model,which are exported and converted into.Sat format,imported into space claim for processing,and then analyzed in the ANSYS Workbench.Finally,according to the analysis results of ANSYS,the rationality of several joint forms is compared,and an optimal connection mode is selected.In the part of the joint model,a description is added to explain the basis of joint design.It provides BIM information feedback for the results of finite element analysis and fully embodies the interaction function of BIM model.