BEHAVIOR OF FRP TUBE STRENGTHENED STEEL MEMBERS UNDER ECCENTRIC COMPRESSION LOAD

Abstract

Abstract: In this paper, the steel columns were strengthened by pultruded GFRP tube, GFRP sheet and grouting, and their behavior was investigated through eccentrically compression tests. Through tests on 20 steel columns, the influences of different sections, slenderness ratios and eccentricity ratios on the strengthening effect were addressed. Ultimate strength after strengthening, failure mode, load-displacement curve,and strains at key positions were investigated. The test results showed that the ultimate strength of strengthened steel members increased by up to 169%. In addition, the failure mode of the eccentrically compressed members were transitioned from global lateral buckling to local deformation in the unstrengthened area. In addition, the finite element model of steel column was constructed, and the simulation results are in good agreement with the test results. Finally, the finite element modeling is used to analyze six parameters including the length ratio of the strengthened section, the bending stiffness ratio, the ultimate strength and yield strength of the steel, the initial deflection of the core steel members and the slenderness ratio of the core steel members, and the influence law of each parameter on the test was revealed.

Key words: FRP composite material, steel column, strengthening approach, eccentrically compression, ultimate strength

CLC Number:

TB332

WEI Shao-jie, FENG Peng, YANG Jia-qi, LIU Tian-qiao. BEHAVIOR OF FRP TUBE STRENGTHENED STEEL MEMBERS UNDER ECCENTRIC COMPRESSION LOAD[J]. Composites Science and Engineering, 2020, 0(9): 48-60.

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