Health Monitoring And Numerical Analysis Of Long-span Space Truss Structures

With the development of science and technology,the application of large-span space structure is more and more extensive,and the technology of health monitoring has been paid more and more attention.In the long-term use of the structure,it is inevitable to cause different damages for various reasons.If not found or handled in time,it may lead to serious consequences.Therefore,it is of great significance to study the technology of structural health monitoring.Based on the background of an exhibition center,the stress and displacement of the structure during construction are monitored in real time,and the structure is simulated by finite element method.The main work includes the following three aspects:(1)The monitoring system is used to continuously monitor the stress and deformation of the structure in the construction process,analyze the change factors of each monitoring point in each construction stage,and simulate the structure with the finite element software Sap2000.The change curves of stress and deformation of each monitoring point under different working conditions are given.The analysis results are compared with the monitoring data,and the analysis and calculation values are compared with the actual values Reasons for differences in measured values.(2)The single and multi-dimensional seismic input of the whole structure is carried out by using El-Centro seismic wave.The displacement of the structure under the seismic load is analyzed and compared.The calculation results show that it is very necessary to use multi-dimensional seismic input for the complex long-span spatial structure.(3)The equivalent static wind loads in X and Y directions of the structure are analyzed,and the maximum displacement and stress of the structure at each measuring point are obtained.The data are summarized regularly,and some main principles and substantive suggestions for wind resistant design of long-span spatial structure are put forward.