Abstract
This paper presents an investigation on residual properties and axial bearing capacity of steel reinforced recycled aggregate concrete (SRRC) column exposed to elevated temperature. 48 specimens were designed for the static loading test after high temperature. The variables include replacement ratios, designed temperature, target duration ,thicknesses of concrete cover, steel ratios and stirrup spacing. From this test, the mass loss ratio and stress load-deformation curve were obtained, and the influences of various parameters on residual bearing capacity were analyzed. ABAQUS was used to calculate the temperature field of specimens to get temperature damage distribution on the cross section concrete. Based on the results from testing and finite element analysis, a method of calculating the residual bearing capacity of SRRC columns under axial compression after high temperature was presented. It is shown that the bearing capacity of specimens reduced as the heated time and exposure temperature increased while it decreased as the cover thickness and steel ratio decreased. The ductility increased with the increase of steel ratio and stirrup ratio but the opposite result appears if the temperature and coverage of concrete increased. The initial damage value increased as the temperature and fire duration increased; with the increasing of replacement ratio and the decreasing of temperature, the temperature of the cross section would increase gradually. Finally, comprehensive experimental research and numerical simulation analysis results show that the calculation results are in good agreement with the experimental results.
Highlights
With the advancement of modernization, old buildings are gradually replaced by new ones, which leads to a number of construction waste
T = 500◦ C, the specimen became taupe and a crack appeared on the concrete
The color of the concrete gradually turned dark and a small amount of temperature crack appeared on the concrete surface
Summary
With the advancement of modernization, old buildings are gradually replaced by new ones, which leads to a number of construction waste. A detailed discussion on the results of the experimental study is provided: where the influence of the replacement percentage of recycled aggregates (0, 30, 50, 70, 100%), the maximum temperature during the test (the maximum temperature at room temperature, 200, 300, 400, 500, 600, 700, 800◦ C), the constant heating time (10, 60, 180 min), the thickness of cover concrete (30, 40, 50 mm), the steel ratio (4.41, 5.59%), the spacing of stirrups (100, 150 mm), and the length of the side of the stirrups (160, 180, 200 mm) There was no thermocouple in the specimen, so the heating curve was collected according to the temperature in the furnace
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