Study On Dynamic Stability Of Single-layer Reticulated Domes Subjected To Non-uniform Load

For decades, with the improvement of living standards and innovation of social progress and great strides in science and technology, the spatial structure has developed more rapidly and widely. At this stage, the spatial structure with increasing span and innovating structural form is more and more applied to public buildings, stadium, exhibition center, airport hangar, entertainment, and so on. While the unique structural advantages and nice visual presentation of the shell structure is more attractive.As a kind of space grid structure, the outer surface of the shell structure is curved.it not only has shell structure’s reasonable stress characteristic, but also has the characteristics of simple and convenient frame structures. At the same time, it can shape the natural Drainage surface. Most loads what the shell structure sustained conveys by its axial force of the bar. And the stress characteristic is similar as the "thin film" effect. So there is something wrong about stability of the reticulated shell structure. At present, studies on the static stability of reticulated shell structure has been relatively mature, while the study on the dynamic stability is not comprehensive. Taking into account the load on reticulated shell structure in daily use is likely to be non-uniform, this paper focuses on the dynamic stability of single-layer spherical shell in non-uniform loads.In order to study the dynamic stability of single-layer spherical shells in uniform and non-uniform loads, meanwhile based on full range nonlinear dynamic response analysis method and the criterion of practical dynamic stability, this paper takes the lamella single-layer spherical reticulated shell as the research object. The model is established using finite element software ANSYS.The non-uniform load is equaled to three conditions such as full span distributed load, full span asymmetry load and half span asymmetry load. The parameter is earthquake dimension(horizontal, vertical, in three-way), rise span ratio, cross-section area, initial geometric imperfections and different seismic wave(EL-Centro wave, Taft wave, Tianjin wave). This paper systematically analysis the dynamic stability under the action of earthquake, and draws some meaningful conclusions, also provide a reference for practical engineering design of reticulated shell structure.