Research On The Optimal Configuration Of Induced Joints In Metro Stations Under Temperature Load

With the rapid development of China's rail transit era,by the end of 2018,35 cities in mainland China had opened 185 urban rail transit operation lines with a total operating mileage of 5761.4 km,including 3412 stations.In the built underground stations,most of them have leakage,which affects the later use.The leakage of water in subway station will not only lead to the damage of structure wall,equipment corrosion,increase the risk of vehicle operation safety and shorten the service life of the structure,but also lead to the uneven settlement of the ground,which will lead to the damage of the ground construction seriously.At present,the use of guide joints has achieved good results in solving the problems of stress concentration and longitudinal deformation of underground railway stations,which has been widely used.In this paper,combined with a new type of water seal induced joint,it can effectively prevent the wall cracking of underground structure without increasing the number of conventional induced joints.BIM(building information modeling)contains many kinds of information,including geometry,spatial relationship,regional information,number and characteristics of building components,budget cost,etc.,which are used to show the whole life cycle of buildings.BIM Technology can be used to know the quantity and common characteristics of materials in real time,and display the overall building structure model in relative proportion.Essentially,it is the utilization of information technology in the domain of architectural engineering.The secondary development of Revit can facilitate the analysis of subway station structure.Firstly,this article expounds the domestic and international research and development status from the three aspects of BIM-based finite element analysis,induced joint finite element analysis and Revit secondary development in the field of metro station.Combined with the research process of optimal allocation of induced joints of subway stations under temperature load,the main research content,technical route and innovation points of the article are proposed.By studying the current status of BIM technology and finite element calculation analysis,the feasibility of digital numerical integration technology is obtained.Secondly,it introduces the key technologies of the system development,including the application of the core BIM software Revit,the Revit API development technology,and the APDL command flow(ANSYS parametric design language)programming.This paper studies the tools and design process needed for the secondary development of Revit.In the Microsoft Visual Studio software development environment,through the Revit interface technology and principle,it explores how to obtain the station structure analysis information,including geometric information and physical parameter information.Then,based on the current situation of the application of BIM Technology in metro projects,the paper studies and analyzes the workflow of BIM Technology in metro projects,and puts forward the rules for building BIM model of metro projects.Through the development tool of Revit API and the program written in C ? language,the 3D structure model of Revit is generated quickly by recognizing the parameters of 2D CAD drawings,including the generation of family models such as grid,structural column,wall,etc.With the further development of Revit and the research of APDL command flow program,the obtained geometric model information of station structure and material and other attribute information are transformed into APDL language,and then BIM model can be quickly and efficiently imported into ANSYS software.Finally,taking Qingpu station project of Shanghai rail transit line 17 as an example,the numerical model of ANSYS is generated by using the developed digital numerical integration system,and the standard section of the station is analyzed by the finite element method.The numerical calculation results and stress diagram of the model are obtained by applying temperature load in ANSYS.The results are analyzed and the spacing of the induced joints is optimized to provide reference for other similar projects.