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Steel and Composite Structures
  Volume 38, Number 5, March10 2021 , pages 563-582
DOI: https://doi.org/10.12989/scs.2021.38.5.563
 


Bond-slip behaviour of H-shaped steel embedded in UHPFRC
Zhenyu Huang, Xinxiong Huang, Weiwen Li, Chufa Chen, Yongjie Li, Zhiwei Lin and Wen-I Liao

 
Abstract
    The present study experimentally and analytically investigated the push-out behaviour of H-shaped steel section embedded in ultrahigh-performance fibre-reinforced concrete (UHPFRC). The effect of significant parameters such as the concrete types, fibre content, embedded steel length, transverse reinforcement ratio and concrete cover on the bond stress, development of bond stress along the embedded length and failure mechanism has been reported. The test results show that the bond slip behaviour of steel-UHPFRC is different from the bond slip behaviour of steel-normal concrete and steel-high strength concrete. The bond-slip curves of steel-normal concrete and steel-high strength concrete exhibit brittle behaviour, and the bond strength decreases rapidly after reaching the peak load, with a residual bond strength of approximately one-half of the peak bond strength. The bond-slip curves of steel-UHPFRC show an obvious ductility, which exhibits a unique displacement pseudoplastic effect. The residual bond strength can still reach from 80% to 90% of the peak bond strength. Compared to steel-normal concrete, the transverse confinement of stirrups has a limited effect on the bond strength in the steel-UHPFRC substrate, but a higher stirrup ratio can improve cracking resistance. The experimental campaign quantifies the local bond stress development and finds that the strain distribution in steel follows an exponential rule along the steel embedded length. Based on the theory of mean bond and local bond stress, the present study proposes empirical approaches to predict the ultimate and residual bond resistance with satisfactory precision. The research findings serve to explain the interface bond mechanism between UHPFRC and steel, which is significant for the design of steel-UHPFRC composite structures and verify the feasibility of eliminating longitudinal rebars and stirrups by using UHPFRC in composite columns.
 
Key Words
    bond slip; shear stress slip; concrete-encased column; ultrahigh-performance fibre reinforced concrete (UHPFRC); steel-concrete composite
 
Address
Zhenyu Huang, Weiwen Li, Chufa Chen, Yongjie Li, Zhiwei Lin: Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,
Shenzhen University, Shenzhen 518060, P.R. China
Xinxiong Huang: Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,
Shenzhen University, Shenzhen 518060, P.R. China;
Guangzhou Expressway Co., Ltd, Guangzhou Communications Investment Group co., Ltd, Guangzhou 510288, P.R. China
Wen-I Liao: Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, P.R. China
 

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