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Steel and Composite Structures
  Volume 10, Number 4, August 2010 , pages 317-329

Study on push-out test and bond stress-slip relationship of circular concrete filled steel tube
Yin Xiaowei and Lu Xilin

    According to the results of 9 circular concrete filled steel tube (CFT) push-out tests, a new theoretical model for average bond stress versus free end slip curve is proposed. The relationship between average bond stress and free end slip is obtained considering some varying influential parameters such as slenderness ratio and diameter-to-thickness ratio. Based on measured steel tube strain and relative slip at different longitudinal positions, the distribution of bond stress and relative slip along the length of steel tube is obtained. An equation for predicting the varying bond-slip relationship along longitudinal length and a position function reflecting the variation are proposed. The presented method can be used in the application of finite element method to analyze the behavior of CFT structures.
Key Words
    concrete filled steel tube; bond-slip; push-out test; constitutive relationship; position function.
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

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