Research On Static And Dynamic Behavior Of Large-Span Single-Layer Ellipsoid Reticulated Shell

Reticulated shells are typical models of space structures, which have their intrinsic mechanical properties. With the wide application of reticulated shells in engineering, the mechanical properties of the structures were more and more paid attention to. Based on FEM and numerical computation, the static characters and dynamic characters as well as the geometrical nonlinear stability of the large-span single-layer ellipsoid reticulated shell were studied in the thesis.After the development and actuality of single-layer ellipsoid reticulated shell structures were reviewed, the thesis firstly described the general situation of project, structural style, calculation model, load cases and load cases combination, then discussed the displacement, axial force, member stress and base reaction of this structure based on linear analysis of its static characteristic by ANSYS.Secondly, based on the result of its static analysis, the static stability of single-layer ellipsoid reticulated shells was thoroughly analyzed with geometrical nonlinear finite element method. For the practical application, the influence on the static stability acted by unsymmetrical distribution of loads, initial geometrical imperfections, supporting condition and sizes of member sections was discussed.And then, the thesis also analyzed the linear seismic behavior of the structure under common earthquake using the vibration shapes-separation-spectra-method. Considering the complex boundary conditions between shell and major structure, the seismic behaviors of single reticulated shell model and integral model including shell and RC frame were studied, and the influences of the deformation of the RC frame were also analyzed in this paper.Finally, some conclusions were drawn and some topics that should be further studied were brought forward.