Static Stability Of Cable Braced Single-layer Cylindrical Grid Shell

As a kind of spatial structure,the reticulated shell structure has various shapes and stretches.It is widely used in various places,such as: terminal building,exhibition center,stadium,etc.It is considered as a symbol of social civilization and has become a country reflecting the 21 st century.The important signs of the level of building technology have broad prospects for development.With the advancement of society and the higher pursuit of human living environment,the reticulated shell structure is also developing towards a larger span,more transparent visual effects,less steel consumption,and now a variety of rigid-flexible hybrid structures.Endlessly emerged,many string-supported dome structures,grid structures,and stringed beam structures have been well applied in practical engineering.The development of China's space structure started later than other countries.The form of reticulated shells that have been put into use tends to be conservative,and newer reticulated shells need to be expanded.This article will continue to explore a larger span,more excellent hybrid structure based on the work of predecessors.On the basis of the quadrilateral mesh cylinder mesh shell,the vertical and oblique cables are arranged in-plane and out-of-plane,forming a new type of cable braced single-layer cylindrical shell,and its stability and mechanics under various influencing factors are studied.Performance and static stability experiment.The main contents of this paper are as follows:(1)According to the characteristics of the single-layer cylindrical reticulated shell structure and the cable structure,combined with the advantages and disadvantages of them,compared with a variety of cable methods,the new cable braced single-layer cylindrical reticulated shell structure is proposed.The structure is optimized.By arranging the struts,the stay cables in the plane,the transverse cables outside the plane,and the diagonal cables,a new Cable braced Single-layer Cylindrical Grid Shell is borned.Design numerical method and analysis method of cable braced single-layer cylindrical reticulated shell structure.Using the APDL language of ANSYS program,an adjustable parametric numerical modeling program was developed,and the standardization steps obtained by ANSYS software were optimized.The modeling and analysis method for the cable braced single-layer cylindrical grid shell was obtained.(2)Verification of the effectiveness of the numerical simulation of the cable-stayed single-layer cylindrical reticulated shell,and the influence of various influencing factors on the ultimate bearing capacity of the cable braced single-layer cylindrical grid shell.The effects of span,struts length,span ratio,cable prestress,uneven load distribution,initial defects,etc.on the static performance and stability of the structure are compared,and the displacement and rod of the structure under static action are compared.The internal force,the instability mode and the ultimate bearing capacity change are used to find out the basic force law of the cable braced single-layer cylindrical grid shell.(3)Design the overall experiment model of the cable braced single-layer cylindrical grid shell,complete the assembly work of the on-site model,determine the loading scheme and data acquisition scheme of the experiment,measure the initial defects of the structure,and conduct the material experiment of the rod.Carry out the overall model comparison experiment of the cable braced single-layer grid reticulated shell,record the whole process of test loading,obtain the ultimate bearing capacity of the comparative experiment model,draw the full load-displacement curve,and analyze the comparative numerical simulation and test results.Verify the effectiveness of this modeling approach.