Abstract
Joints in single-layer latticed shells are mainly subjected to combined bending moment and axial force. The value and direction of the axial force may have a significant influence on the flexural capacity and stiffness of the joint systems. Therefore, the combined effect of the bending moment and axial force should be fully considered when evaluating the mechanical performance of a novel joint system. In this paper, the eccentric bearing capacities and failure modes of aluminum assembled hub (AAH) joints are investigated by laboratory tests and numerical studies. The correlation formula between the axial capacity and the bending capacity of AAH joints is derived by nonlinear regression to guide the actual design. In addition, the variation in the initial bending stiffness with the axial force-to-moment ratio λ corresponding to different force states is further evaluated. The results indicate that under combined loads, the axial capacities of AAH joints are positively related to λ while the bending capacities are negatively related to λ. It is demonstrated that λ has a significant influence on the initial bending stiffness of AAH joints in large eccentric tension state and large eccentric compression state, which should be fully considered in the stability analysis of aluminum single-layer latticed shells with AAH joints.
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