Research On Spoke-type Cable-supported Roof Under The Action Of Rust And Temperature Based On Digital Twin

Because of its beautiful shape and good mechanical properties,the spoke cable supported roof has been widely favored by stadium builders all over the world.The corrosion of components and local temperature have great influence on the safety of spoke cable supported roof.The structural mechanical properties and structural displacement changes under its working conditions are the research hotspot in the field of structural engineering.With the advent of the wave of scientific and technological revolution,massive emerging technologies such as Internet of things technology,5g technology,digital twin technology and big data technology have sprung up.Traditional construction industry is born with high resource consumption,large labor consumption,high production risk,information barriers and other industry weaknesses,which need to be supplemented by the integration of a variety of emerging information technology.In this paper,partial experiments and finite element numerical simulation are carried out to study the effect of corrosion and local temperature on spoke cable supported roof structure.An intelligent platform based on digital twin technology is built to map the structure corrosion damage and local temperature influence.The main research contents are as follows:(1)Through BIM(building information model)and 3D scanning technology to generate point cloud model,modify BIM model and correct finite element model,improve calculation accuracy and reduce analysis error.Using this method,the influence of corrosion and local temperature on the spoke cable supported roof was tested and analyzed by the finite element method.The feasibility of improving the simulation accuracy was verified.(2)According to the reduction of cable cross-section by percentage,the change process of cable corrosion from no corrosion to 80% of cable section is analyzed,and the change unit is 10% section corrosion.The influence of the corrosion of the upper and lower ring cables and the upper and lower radial cables on the mechanical properties and displacement of the structure is analyzed.Only 50% of the overall cable cross-section corrosion condition is tested and analyzed,and the rest conditions are analyzed by finite element simulation.(3)In order to analyze the influence of local temperature on the structure,four working conditions are designed,namely quarter span temperature action,half span temperature action,three quarter span temperature action and full span temperature action.According to the design value of the completed steel structure building,the temperature range is determined as-75 ℃-75 ℃,and the change unit is 15 ℃.When the whole structure is under ± 75 ℃,the length of cable is adjusted for test analysis,and the finite element simulation analysis is carried out for other working conditions.(4)With the intelligent platform based on digital twin technology,the operation and maintenance of 50% section corrosion condition of integral cable and ± 75 ℃ environmental condition of overall structure are carried out.It can be used as a reference for the risk assessment of the intelligent structure.