Research On Structural Selection And Design Of Large Span Spatial Struction

With the improvement of people's living needs,more and more large-span spatial structures have emerged,and the selection of large-span spatial structures is crucial to the aesthetics,economics,and ease of construction of buildings.In this paper,according to a super eco-city project,various types of evaluation indexes of different structural forms are compared,and then the steel structure plan for large-span roofs is further optimized.First,a calculation span of 200-300 m is selected.Based on evaluation indexes such as mechanical performance of the structure,appearance of the building,use of space,area of ??the envelope,and economy,the beam-type structural system,arch-type structural system,and cable-stayed structural system are studied separately.Performance indicators.The recommended cross-height ratio index for a beam structure system was proposed.Based on the cable structure,a reasonable equivalent static wind load distribution was obtained on the surface of the membrane.The concrete tower column or steel structure-lattice column support method in the center area was compared.The rationality.Secondly,according to the several structural forms studied in this paper,the matching of membrane material,metal curtain wall,glass curtain wall and main structure was studied,and the realization scope of the applicable span,connection node,drainage and snow removal functions of the envelope structure was analyzed.The weight of the envelope structure system was analyzed and its influence on the economic indicators of the main structure was analyzed.Finally,according to the main structural system studied in this project,the basic design calculation methods under the typical geological conditions in Xi'an area were studied.The natural foundations were compared and analyzed through different bearing layers,different foundation depths,different basic layouts and calculation methods.Based on the technical and economic indicators of foundation projects such as composite foundations,the optimal basic design calculation method was found and rationalization proposals were put forward.