Abstract
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.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51608003, 51578001 and 51878002), Ministry of Housing and Urban-Rural Development (No. 2012-K2-7), Key Research and Development Plan of Anhui Province (No. 1704a0802131), and the Outstanding Young Talent Support Program of Anhui Province (No. gxyqZD2016072). This work was also supported by the Collaborative Innovation Project of Colleges and Universities of Anhui Province (No. GXXT-2019-005).
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Yu, F., Chen, T., Niu, K. et al. Study on Bond-Slip Behaviors of Self-Stressing Steel Slag Concrete-Filled Steel Tube. KSCE J Civ Eng 24, 3309–3319 (2020). https://doi.org/10.1007/s12205-020-1596-7
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DOI: https://doi.org/10.1007/s12205-020-1596-7