The proposed assembly joint with skeleton membrane structure has the characteristics of simple structure,high degree of prefabrication,easy on-site assembly,adjustable reduction of processing errors,adaptability to various shapes of skeleton membrane structures and clear force transmission.Based on Hertz contact theory,the stress distribution form of the key load-bearing structure of the joint—the pin axis connection was analyzed and verified by finite element analysis.Based on the finite element analysis,the best connection mode between the bar and the trunnion plate in the joint was obtained,the three-dimensional model of the joint was simplified and the finite element analysis model was established.The ultimate bearing capacity of the joint was calculated,and its failure mode was obtained,which is compared with that of the spatially penetrated welded steel pipe joint of the same specification.The results show that the failure of the assembly joint is controlled by the lower chord and meets the design requirements of"strong joint,weak member".The ultimate bearing capacity of the assembly joint is 2.95 times of the design load and almost the same as that of the spatially penetrated welded steel pipe joint of the same size,it has sufficient safety margin and can be more flexibly applied in various building structures.
assembly jointskeleton membrane structurepinned connectionHertz contact theoryfinite element analysisbearing capacity
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