Analysis Of Aseismic Performance On Partial Double Layer Spherical Reticulated Shell

Spherical reticulated shell structure has the Structure characteristics of large span and large span,rational strength and beautiful appearance. It has been widely used in each countries’sports and cultural venues,waiting hall and other landmark public buildings.sports buildings and public buildings in recent years. Most of these buildings are crowded places. Once the earthquake cause buildings damaged. It will cause a great loss.So the seismic performance analysis and enhancement of this kind of structure seismic is necessary.This paper made the seismic performance analysis of the six categories and ten kinds of pyramid system partial double layer forms of classical spherical shell.1) This paper used parametric design language APDL of ANSYS to establish the six categories and ten kinds of pyramid system partial double layer forms of classical spherical shell model, and obtained the length formula of the six categories and ten kinds of classical single-layer spherical lattice shells by using Maple.The application of the formulas and parameters design software have an important engineering value for standardized design, construction and maintenance of the spherical reticulated shell structure.2) This paper used ANSYS software to analyze the natural vibration characteristics of the six categories and ten kinds of pyramid system partial double layer forms of classical spherical shell model and made376examples using the subspace iteration method.lt calculated the frequency and mode of model under different basic parameters and learned the self vibration characteristics of reticulated shell structure.Then it compared the monolayer and the partial double layer forms and analyzed the vibration characteristics under the impact of the ratio of rise to span, the ratio of thickness to span, section, circular symmetric region number and radial node number.3) This paper used El-centro three-dimensional seismic wave to make nonlinear dynamic response analysis of six categories and ten kinds of classical spherical shell monolayer forms and pyramidal system partial double layer forms using ANSYS.This paper used ideal elastic-plastic model and combined with Newton-Raphson method and Newmark method to make nonlinear equations of motion.It made376example to calculate the displacement and displacement’s time history curves of the maximum displacement node under different basic parameters of shell. Then it compared the monolayer and partial double layer forms and analyzed its seismic performance under the impact of the ratio of rise to span, the ratio of thickness to span, section, circular symmetric region number and radial node number. It obtained the basic law of the response of six categories and ten kinds of classical spherical shell pyramidal system partial double form under earthquake.Finally, this paper summarized modeling, the performance of vibration and the seismic performance of partial double layer spherical reticulated shell structures and pointed out the problems to be solved in the next step research work.