Structural design and research on construction key technology of new string aluminum alloy structure with dense column cylinder support
The World Expo Greenhouse project roof is a curvature-free plane composed of arbitrary irregular curves,and adopts a shaped polygonal mesh to increase light transmittance.Based on these characteristics,structure selection adopted a string aluminium alloy grid structure.The new extruded"日"type aluminium alloy members were extruded to better withstand bending moment in the roof surface and to ensure effective force transmission between members and overall structure plane.The new type of rigid gusset plate joint was designed,its stiffness and ultimate bearing capacity were investigated through full-scale tests and refined finite element analysis.Test's results and finite element comparison analysis show that this type joint has high shear resistance and in-plane and out-of-plane load capacity.Digital processing techniques for bending-twisting components and the assembly pre-fabrication technology for irregular aluminum alloy special units were elaborated and integration design technology of façade curtain wall and main structure was introduced,in which façade curtain wall panels design for the first time takes into account deformation of the main structure through the overall synergistic analysis,and the calculation results show that design structure meets the requirements.Construction tensioning simulation method of two-way orthogonal arrangement of tensioning cables is highlighted,and it is verified that this structure is in a safe state with graded tensioning of cables,and structure deformation after tensioning meets the requirements.
NETL
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