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http://dx.doi.org/10.12989/scs.2021.41.5.731

Axial compression mechanical properties of steel reinforced recycled concrete column exposure to temperatures up to 800℃  

Chen, Zongping (College of Civil Engineering and Architecture, Guangxi University)
Liang, Yuhan (College of Civil Engineering and Architecture, Guangxi University)
Mo, Linlin (College of Civil Engineering and Architecture, Guangxi University)
Ban, Maogen (College of Civil Engineering and Architecture, Guangxi University)
Publication Information
Steel and Composite Structures / v.41, no.5, 2021 , pp. 731-746 More about this Journal
Abstract
The purpose of this paper is to investigate the axial bearing capacity and residual properties of steel reinforced recycled aggregate concrete (SRC) column after elevated temperature. A total of 48 SRC columns were designed for the static loading test after elevated temperature. The variables include replacement ratios, designed temperature, target duration, thicknesses of cover concrete, steel ratios and stirrup spacing. From this test, the mass loss ratio and stress load-deformation curve were obtained, and the influence of various parameters on residual bearing capacity were analyzed. ABAQUS was used to calculate the temperature field of specimens, and then got temperature damage distribution on the cross-section concrete. It was shown that increasing of the elevated temperatures leaded to the change of concrete color from smoky-gray to grayish brown and results in reducing the bearing capacity of SRC columns. The axial damage and mechanism of SRC columns were similar to those of reinforced natural aggregate concrete columns at the same temperatures. Finally, the calculation method of axial compressive residual bearing capacity of SRC columns recycled concrete columns after high temperature was reported based on the test results and finite element analysis.
Keywords
axial compression; bearing capacity; fire test; static test; structural steel reinforced recycled concrete column;
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