Simulation Analysis And Monitoring Of Construction Tension Of Large Opening Cable Supported Grid Structure

In recent years,with the needs of life and production,people’s demand for large-space and long-span structures is increasing urgently.Cable-supported reticulated shell structure,as a large-span spatial structure,is used in various large stadiums,exhibition halls,etc.For stadiums,because of its functional and economic requirements,its center is often an open field,so there is often a large opening in the middle of the building plane.In order to meet the needs of this large opening and pursue a simple and transparent architectural effect,a Large opening cable supported grid structure is proposed and applied in practical projects.Because of the limitation of large opening,the construction tension process of the structure is difficult.Therefore,the safety and accuracy of the construction process can be effectively improved by simulating the construction tension process and monitoring the construction site.Therefore,by simulating the construction tension process and monitoring the construction site,the safety and accuracy of the construction process can be effectively improved.In this paper,taking a sports center in Sichuan as the background,and the finite element model of the sports center structure is established with the help of large-scale finite element software ANSYS.Based on the established finite element model,according to the construction tension scheme,the whole process of construction tension is simulated and analyzed,and the structural response of construction tension process is obtained.The simulation results are compared with the design values,and the results show that the simulation values are basically consistent with the measured values.In addition,by comparing the results of batch tension forming with those of one-time tension forming,it is found that the difference between them is very small.Finally,the influence of verticality deviation of stay bar and cross-sectional area deviation of cable on cable force is briefly analyzed.Secondly,in order to ensure the safety of the construction process,health monitoring is carried out on the whole tensioning process.By obtaining the measured values in different construction tensioning stages,the possible errors and damages in the construction tensioning process can be adjusted and remedied in time.Comparing the measured data with the theoretical data,it is found that the measured values of cable force,strut stress and rigid grid str ess are basically consistent with the theoretical values.Some joints have large deviation in displacement,and the reasons of deviation are analyzed.The verticality deviation of some struts exceeds the allowable deviation,but the deviation exceeds less than 1/100,which meets the construction requirements.Finally,the transient dynamic complete integration method and element life-anddeath technique are used to analyze the local cable breakage of Large opening cable supported grid structure during construction tension.The effects of local radial cable and circumferential cable breakage on the structure after 50%,90% and 100%tensioning are considered respectively,and the effects of multiple radial cable breakage on the structure are analyzed.Finally,the method of judging the importance of cables is introduced,and a two-factor importance index based on node displacement and cable force change is considered to judge the importance of cables and rank their importance.The results show that the fracture of different types of cables has different effects on the structure,and the fracture of circumferential cables has the greatest influence on the structure.By ranking the importance,it is found that the node of No.5 cable and the importance coefficient of cable force rank first.