ANALYSIS ON FORCE TRANSMISSION MECHANISM OF GFRP TUBE STEEL-REINFORCEDCONCRETE COMPOSITE SHORT COLUMN UNDER AXIAL COMPRESSION

doi:10.19936/j.cnki.2096-8000.20210628.002

Abstract

Abstract: Through the axial compression tests of 6 GFRP tube steel-reinforced concrete composite short columns and 1 GFRP tube confined concrete composite short column and the use of ABAQUS for finite element numerical analysis, the effects of section form, section steel ratio, and concrete strength on the mechanical properties of the composite short column was studied, and the working mechanism of the composite column was explored. The test results show that the built-in steel can significantly improve the ultimate bearing compression capacity and ultimate deformation capacity of short columns compared with specimens without built-in steel. With the increase of the steel content of the section, the ultimate bearing compression capacity and ultimate deformation capacity of the GFRP tube steel reinforced concrete short columns have been obviously improved. Increasing the strength of concrete can improve the ultimate bearing capacity of short columns, but it has little effect on the initial rigidity of short columns. When other conditions are the same, the built-in steel tube short column has higher ultimate bearing capacity and better deformation capacity than the built-in I-steel short column. The restraint effect of GFRP tube on concrete is slightly later than that of steel tube on concrete, showing a certain hysteresis. The results of finite element simulation fit well with the experimental results, which can provide a reference for the nonlinear analysis of such composite short columns.

Key words: GFRP tube; steel reinforced concrete; axial compression; bearing capacity; force transmissionmechanism

CLC Number:

TB332

YIN Chao-zheng, LI Shun-tao, YANG Wen-wei. ANALYSIS ON FORCE TRANSMISSION MECHANISM OF GFRP TUBE STEEL-REINFORCEDCONCRETE COMPOSITE SHORT COLUMN UNDER AXIAL COMPRESSION[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(6): 12-19.

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