Seismic And Dynamic Stability Analysis Of The Huge Reticulated Structure

Seismic analysis and dynamic stability analysis are important contents in large structural analysis. With the Huge Reticulated Structure System being the object of the study, Seismic analysis, dynamic stability analysis under step loads, disposal of complex loads and mechanism instability were studied in this paper. The main contents are summaried as following.Firstly, researched the mechanism characteristic of the Huge Reticulated Structure System. The structure's dynamic character was computed by FEM theory and method of sub-space iteration and the frontal 60 vibration frequency and vibration shapes were distilled. Moreover, the influence of ratio of the rise-span, rigidity of supports, lattice size and the ratio of long-span were argued. Seismic analysis was computed by response spectrum method and the result was bigger than the time-history result.Secondly, summarized the study situation of dynamic stability in special structure, the paper analyzed the dynamic time-history curve of the huge reticulated structure on step loading with the method of dynamic tracing and judge structures' dynamic instability with space principle.Thirdly, the wavelet theory was introduced to compose the complex loading signals and had researched the process of its carrying out in Matlab. On the base of analysising the dynamic stability of the Cylindrical Huge Reticulated structure, this article summarized the reason and characteristic of the mechanism instability of the huge cylindrical reticulated structure system.Fourthly, this paper introduced the catastrophe theory and derived the spire catastrophe modal from potential energy function in latticed shell structure. Then the paper discussed the interior reason for structure buckling and obtained the dynamic instability criteria.Some conclusions in this paper were drawn. And some problems need to be solved further were brought out too.