Vol. 20, No. 3, pp. 310-318 (2024)
A MODEL FOR PREDICTING THE MOMENT-CURVATURE BEHAVIOR OF
STEEL TUBE CONFINED REINFORCED SELF-STRESSING STEEL
SLAG CONCRETE COLUMNS UNDER CYCLIC LOADING
Feng Yu 1, 2, Wei Liu 1, Shuang-Shuang Bu 1, *, Guang-Fei Kuang 1 and Yuan Fang 1
1 Department of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, 243032, China
2 Wuhu Technology and Innovation Research Institute, Anhui University of Technology, Wuhu, 241002, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 13 October 2023; Revised:8 April 2024; Accepted: 21 April 2024
DOI:10.18057/IJASC.2024.20.3.10
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ABSTRACT
This paper evaluates the moment-curvature response of steel tube confined reinforced self-stressing steel slag concrete (STCRSSSC) columns by conducting cyclic loading tests on ten STCRSSSC columns and four steel tube confined reinforced steel slag concrete (STCRSSC) columns. Four parameters are considered: axial compression ratio, shear-span ratio, diameter-thickness ratio, and expansion rate of steel slag concrete (SSC). The results show that the specimens exhibit a bending failure mode. As the expansion rate of SSC or shear-span ratio increase, the area of the moment-curvature hysteretic loops expands, but the slope of the skeleton curve remains basically unchanged. The slope of the skeleton curve rises as the diameter-thickness ratio or axial compression ratio increase. With the reduction of the axial compression ratio or diameter-thickness ratio, the area of the hysteretic loops increases. Based on the experimental results, the characteristic points of the response are identified, and a simplified model is proposed to predict the skeleton curves. Lastly, a hysteresis rule of the specimens is suggested based on the Clough trilinear degeneration model, and a predicting model of the response of the specimens is established.
KEYWORDS
Concrete-filled steel tube, Steel tube confined concrete, Steel slag, Self-stressing concrete, Hysteresis behavior, Restoring force model
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