Study on Bond-Slip Behaviors of Self-Stressing Steel Slag Concrete-Filled Steel Tube
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-1596-7
Structural Engineering
Study on Bond-Slip Behaviors of Self-Stressing Steel Slag Concrete-Filled Steel Tube Feng Yua, Taiyao Chena, Kang Niua, Shilong Wang
a
, Zhengyi Kong
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, and Yuan Fang
a
Dept. of Civil Engineering, Anhui University of Technology, Ma'anshan 243002, China
a
ARTICLE HISTORY
ABSTRACT
Received 6 September 2019 Revised 15 January 2020 Accepted 4 June 2020 Published Online 28 August 2020
The bond-slip behaviors of self-stressing steel slag concrete filled steel tubes (SSSSCFST) are investigated by carrying out the push-out tests. The influence of thickness to diameter ratio, confining parameter and expansion ratio of steel slag concrete (SSC) on bond-slip performance are analyzed. Investigations of the failure modes of each specimen indicate that the shear failure of the bond interface dominates the failure of the specimen. Further, three stages of the load-slip relationship curve of bond slip was observed, i.e., the loading stage, descending section and constant load section. In the loading section, with the increase in thickness to diameter ratio or confining parameter, the interface bonding force of specimen improves firstly and then decreases. Besides, the interfacial bond strength increases with enhancement of the expansion ratio. In the descending section, the interfacial bonding force raises with improvement of diameter-thickness ratio, while decreases as the confining parameter and expansion ratio increase. Moreover, the influence of considered parameters on the ultimate interface bond load is analyzed. Finally, a theoretical model for the bond-slip behaviors of SSSSCFST is proposed by accounting for the non-uniform distribution of interface bond strength. It indicates that the theoretical model can well capture the main features that are exhibited during the whole process of push-out test.
KEYWORDS Bond strength Expansion ratio Self-stressing concrete-filled steel tube Statistical model Steel slag concrete Thickness to diameter ratio
1. Introduction Steel slag is rapidly increasing recent years with the development of iron and steel industry, which poses a threat to the environment and the waste of natural resources. The creation of steel slag concrete (SSC) tends to be a beneficial way to utilize steel slag. The feasibility of SSC has been studied in terms of mix proportion, durability and strength (Cerulli et al., 2003; Shi et al., 2015; Saxena and Tembhurkar, 2018). High strength and fine durability of SSC has been proved. However, steel slag contains dissociative calcium oxide and magnesium oxide, which would be expanded when hydration (FrÃas et al., 2010; Brand and Roesler, 2015; Mi et al., 2015). To a large extent, the practical application in civil engineering of SSC is limited. Concrete-filled steel tube (CFST) structure was studied earlier by Tomii (1977), and the mechanical properties of CFST structures were intensively investigated (Kim et al., 2011; Lu and Zha, 2012; Phan and Tr
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