Stability Performance Of 800-meter-span Double Layer Domes

Along with the rapid development of large-span stuctures, people provide more and more demand of large space buildings, and human’s pursuit and study on the super span domes never stop. Scholars have put forward a variety of ideas in the field of structure selection, but the structural form that may be realized is still in the exploration. According to the previously proposed 800-meter-span dome models, this paper selects double-layer cross truss spherical reticulated shell as the research object, which has a better performance of all structure. The rationality and possibility of realization are discussed as well. The structure is modeled by finite element software ANSYS and APDL programming language is used to generate structure of automatic element selection, which also is used to study the static and stable performance. At the same time, considering the member initial bending, initial node deviation and material nonlinearity this paper uses Arc-length method tracing the equilibrium path of structure. This paper selects the performance of stability as the goal of parameter analysis, and puts forward the rational selection and suggestions. This paper has carried out some research works as following:(1) based on the finite element method, models of the 800-meter-span double layer reticulated cross truss shell and the whole process of the load displacement was realized. And the stress characteristics of the structure were analyzed. Respectively, contrast with the same type of small span structures as well as the same span of other types structures, found that the structure was reasonable and had practical significance, laying the foundation for the follow-up system to carry out study on this type of structure.(2) stable performance of 800-meter-span double layer reticulated shell structures were parametric analysis in this paper, considering the effect of geometry nonlinearity and material nonlinearity. This paper examined 399 examples’ characteristic on buckling mode, critical load and plastic development distribution. Also the influence was summed up of 5 parameters, such as the thickness to span ratio, rise span ratio, the ring division frequency, initial geometric imperfection, unsymmetrical distribution of loads to the 800-meter-span double layer reticulated shell stability bearing force. And suggested values for the 800-meter-span double layer reticulated shell design was given, considering the economic performance and the static performance as well.(3) based on the statistics of the 800-meter-span double layer reticulated shell buckling failure,this paper studied the deformation and stress response, finding that the largest deformation region was between two ribs, the maximum stress of the bearing was near the bearings, and the main ribs also had larger force. So these three region were partly strengthened, and the author quantified the three schemes’ improvement on economic performance, static performance and the stability, which provided a reference to research and engineering application on the type of structure in this paper.