Abstract

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Title:: Influence of Interface State of Rectangular Concrete-filled Steel Tube on Flexural Performance of Component

Author(s):: LIU Yong-jian; LI Hui; ZHANG Ning; Shaanxi Provincial Major Laboratory for Highway Bridge & Tunnel, Chang’an University

Keywords:: rectangular concrete-filled steel tube; interface state; flexural performance; bond strength; flexural bearing capacity

Abstract:: The authors studied fully-bond and free-slip of steel and concrete which were the two kinds of ultimate state, discussed the neutral axis translation rules of rectangular concrete-filled steel tube component under bending process, and based on the plane cross-section assumption, the two kinds of calculation method about interface state under flexural bearing capacity were given. At the same time, average bond strength between steel tube and core concrete interface to analyze effective compressive zone height of the flexural member was introduced. The results show that the interface debond leads to premature failure of the core concrete flexural bearing capacity and decrease of overall flexural rigidity and bearing capacity of components. The greater aspect ratio is, the greater influences of the performance interface between steel tube and core concrete on the performance of the bearing capacity of bending members are. In fact, it makes full use of material strength of the core concrete by enhancing the bond strength between steel and concrete to reach the ultimate compressive strength before the steel-concrete interface debond.