Study On The Rigidity Of Cable Dome And Its Performance

The cable dome structure has the advantages of light weight, high material utilization rate, large span, low cost, beautiful appearance and other advantages, has attracted much attention in engineering field. Notochord is easy to relax, Circular beam design section is large, construction technical requirements is high, Aiming at the problems about the cable dome, this paper puts forward the idea of stiffening cable dome,and Kiewitt domes structure as the research object, using truss to replaces the main notochord of the original structure, the finite element model is established by the ANSYS finite element analysis software,Kiewitt cable dome structure stiffened is system analysis with structure.Considering geometric nonlinear structure, the paper analyzes the response of stiffening cable dome structure in full-span live load, half-span live load, and wind load. The method of using whole loading process curve tracks discipline of members force and nodes displacement, compared with traditional cable dome structure, to understand the stiffening effect of cable dome structure players. Then, by changing the structural parameters, author observes changes with internal force and structural stiffness under the load condition, and determines the main parameters about influencing the structural static performance.The paper simulates failure about notochord、oblique cable、Circular cable in different locations by life and death technology, observe internal-force change of the rest of the components and the final equilibrium position of the structure. Whether the structure is safe through judging the node displacement, whether the structure will occurs continuous collapse through judging single-cable failure to cause other components damage. According to the breaking cable to the influence degree of the structure, the paper does important classification about cables for design and construction reference.The Modal analysis of the stiffening cable dome structure is carried out, the use of Block Lanczos algorithm is for solving the structural frequencies and mode shapes of the structure, and analyzes the structural vibration characteristics. Then, the paper discusses the natural frequency variation with structural parameters. Finally, the paper uses time-history analysis theory to conduct structural three-dimensional seismic analysis, it aims at understanding the seismic performance of the stiffening cable dome.Finally, the paper summarizes the research results, and points out several issues with stiffening cable dome that need further research.