Abstract

The built-in open-hole type stiffened rectangular steel tube concrete refers to a new combined structure formed by forming an open-hole steel plate in the longitudinal direction of the inner wall of the steel pipe and then filling the concrete. In order to study the function of the built-in open-hole stiffened joints, the design of the stiffened rectangular steel tube concrete was designed to analyze the influence of the mechanical properties of the steel-mixed interface. The results show that the vertical rib opening is formed, and the bearing capacity of the rectangular steel tube concrete interface is increased by 2.06 times under the limit state. The shear stiffness and shear capacity of the interface are improved by more than 4 times under normal use.

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