Bond slip constitutive model of circular steel tube and high-strength pebble mechanism sand concrete

Abstract

Abstract: In order to study the interfacial bond and slid performance of high-strength pebble mechanism sand concrete with circular steel tube, pull-out tests were conducted on 27 short column specimens of high-strength pebble mechanism sand concrete and circular steel tubes to obtain load slip curve parameters. The development stages and mechanisms of bond and slid of the specimens were analyzed, and the influence of different position distributions on bond and slid performance was investigated. A bond stress slip constitutive model considering position changes was derived. The results show that the bond and slid of high-strength pebble mechanism sand concrete with round steel tubes go through four stages: bond, slid, frictional resistance, and post slid. The order of slid at different positions of the specimen is different. The applicability of the proposed constitutive model for bond and slid of circular steel tube and high-strength pebble mechanism sand concrete in the experimental specimens introduced in this paper was verified. Based on the above constitutive model, the changes in local bond strength and slid values of the specimens were reflected by introducing a position function. A bond and slid constitutive model considering position changes was proposed, which can more fully reflect the local bond and slid laws and mechanisms.

Key words: bond stress slip constitutive model, bond slip, bond strength, circular steel tube, high-strength pebble mechanism sand concrete

CLC Number:

TU528

GUAN Min-sheng, ZHENG Zong-ying, ZHANG Kun, DU Hong-biao. Bond slip constitutive model of circular steel tube and high-strength pebble mechanism sand concrete[J]. Journal of Lanzhou University of Technology, 2025, 51(3): 119-126.

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URL: https://journal.lut.edu.cn/EN/

https://journal.lut.edu.cn/EN/Y2025/V51/I3/119

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