PERFORMANCE OF CONCRETE CONFINED WITH STEEL SPIRALSAND BFRP UNDER AXIAL COMPRESSION

Abstract

Abstract: A total of 21 specimens was tested under axial compression to investigate the performance of the concrete columns externally confined with the fiber-reinforced polymer (FRP) and internally confined with steel spirals. The main experimental parameters of the experiment were the number of FRP layers and the spacing of the steel spirals. The test results show that performance of the FRP-steel-confined concrete columns is superior to that with only one confining material (FRP or steel). With the increase in the number of BFRP layers or the confinement ratio of steel spirals, the bearing capacity and deformation ability of the specimens increase accordingly. Longitudinal stress-strain curves of FRP-steel-confined concrete specimens consist of four stages of elastic stage, transition stage, hardening stage and residual stage. Based on the test results in this study and previous literature, the bearing capacity calculation model was proposed. The comparisons show that the predicted results are in good agreement with the experimental values.

Key words: fiber reinforced polymer (FRP), steel spiral, confined concrete, axial compression test, load carrying capacity

CLC Number:

TB332

WEI Yang, ZHOU Yong-feng, ZHANG Xi, DUAN Mao-jun. PERFORMANCE OF CONCRETE CONFINED WITH STEEL SPIRALSAND BFRP UNDER AXIAL COMPRESSION[J]. Fiber Reinforced Plastics/Composites, 2016, 0(4): 5-11.

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