Research on the progressive collapse resistance of single-layer cylindrical latticed shells with AH joints

摘要

Progressive collapse accidents of single-layer latticed shells introduce a serious threat to public safety. The progressive collapse-resisting capacity (PCRC) has gradually become an essential requirement in the design of spatial structures. In this study, the progressive collapse test and numerical simulation of a single-layer cylindrical latticed shell were conducted to evaluate the effect of the joint stiffness on the PCRC of fabricated single layer latticed shells. A combined spring model was established to simulate the semi-rigid performance of fabricated joints in the FEA. The failure mechanism of single-layer cylindrical latticed shells with different joint systems was thoroughly discussed from multiple perspectives. The results show that the combined spring model can accurately simulate the progressive collapse of a single-layer latticed shell with semi-rigid joints. The progressive collapse of the cylindrical latticed shell with type-II AH joints showed brittle features during the test. Most joints experienced connection failure. Although the rigid jointed shell and latticed shell with type-II AH joints have much higher PCRC, the semi-rigid jointed shell with type-I AH joints has better ductility during progressive collapse. This paper offers a reference for the progressive collapse-resisting design of latticed shells with fabricated joints.