Vol. 19, No. 4, pp. 353-365 (2023)
BEHAVIOURS OF STEEL-CONCRETE COMPOSITE BEAMS AT LOW
TEMPERATURES: MATERIALS AND STRUCTURES
Jia-Bao Yan, Er-Cong Kang * and Jian Xie *
School of Civil Engineering / Key Laboratory of Coast Civil Structure Safety of Ministry of Education,
Tianjin University, Tianjin 300350, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 22 February 2023; Revised: 22 May 2023; Accepted: 25 May 2023
DOI:10.18057/IJASC.2023.19.4.4
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ABSTRACT
This paper reported the low-temperature ultimate strength behaviours of steel-concrete composite beams (SCCBs) from material to structure levels. Firstly, low-temperature mechanical properties of constructional materials in SCCBs, e.g., concrete, headed studs, and mild steel plate for I-beams, were experimentally studied. The studies on constructional materials showed that decreasing the temperature (T) from 20 to -80 ℃, the strength and ductility of headed studs and I-beam were generally increased; the decreasing T increased the strength, but reduced the ductility of concrete. Followed, the shear and tensile behaviours of headed studs in concrete at different T levels of 20~-80 ℃ were experimentally investigated. Test results showed that decreasing T from 20 to -80 ℃ increased the shear and tensile resistance of headed studs, but showed different effects on ductility. Four-point bending tests on three SCCBs were performed at T of 20, -30 and -60℃ to investigate the low-temperature ultimate strength behaviours. These tests showed that at low temperatures all SCCBs failed in flexure with crushing of top concrete slab and yielding of bottom I-beam. Decreasing T from 20 to -30 and -60℃ increased the ultimate strength of SCCBs by 10% and 24%, respectively. A series of prediction equations were proposed to incorporate the effects of the decreasing T on compressive and tensile strength of concrete, shear and tensile capacity of studs, and ultimate bending resistance of SCCBs. Their accuracies have been validated by these material and member tests.
KEYWORDS
Steel-concrete composite beam, Low temperature, Composite structure, Arctic engineering, Shear stud, Material test
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