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Study on bond slip behavior of concrete filled steel tubular based on push out test

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Document pages: 13 pages

Abstract: Taking the strength, slenderness ratio and width thickness ratio of core concrete as the influencing factors, the bond slip behavior of concrete-filled square steel tubular interface is studied; Nine specimens were designed by 3-factor and 3-level orthogonal test. In addition, different from the above 9 samples, an un derusted sample was designed for comparison. According to the bond stress distribution and deformation coordination relationship between specimens in the test process, the theoretical formula for calculating the relative slip of CFSST is deduced. The results show that the relative slip at the loading end is earlier than that at the free end with the increase of load; Interfacial bonding failurere and relative slip gradually developed from the two ends towards the centre of the specimens; the increase of the bond stress in the middle part was faster than that at the ends of the specimens. The order of these factors from main to secondary is the presence of rust in the inner wall of the square steel tube, the slenderness ratio, the core concrete strength, and the width-to-thickness ratio.

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