1.Fuzhou University， Fuzhou 350116， China 2.Fujian University of Technology， Fuzhou 350118， China 3.Fuzhou University ZhiCheng College， Fuzhou 350002， China 4.Università degli Studi di Modena e Reggio Emilia， Modena 41125， Italy
Abstract：To study the seismic performance of steel tube confined reinforced ultra-high performance concrete（SSTCRU） stub columns， five specimens were designed and tested using Pseudo-static tests with variables such as steel tube confinement， axial compression ratio， and shear span ratio. Unsing the OpenSees software， a nonlinear finite element model was established that simultaneously considers the shear effects and strain penetration effects. Furthermore， a macro-simplified model based on the Bouc-Wen model was proposed. The outer steel tube improves shear capacity and prevents diagonal shear cracks， shifting failure from brittle shear to ductile flexure. Failure primarily concentrates in the bottom crack zone， with internal concrete cracks extending vertically along the height， typically spanning 2-10cm. As the axial compression ratio increases from 0.1 to 0.3， the lateral bearing capacity of the specimens increases by 33.96% and 21.79%， respectively. And the initial stiffness increases by 29.46% and 14.62%， respectively. The increase in the axial compression ratio enhances the confinement effect， delays crack development， reduces the stiffness degradation rate， and improves the ductility coefficient. However， it also exacerbates the second-order effects of axial force， leading to increased damage to the crack zone. The increase in the shear span ratio reduces the confinement effect of the steel tube， leading to accelerated stiffness degradation and reduced ductility. The numerical models established based on OpenSees software and the Bouc-Wen model can accurately reflect the hysteresis performance of the structure， showing good applicability.
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