AXIAL COMPRESSIVE PROPERTIES OF GFRP REINFORCED CONCRETE COLUMNS WITH SQUARE SPIRAL STIRRUPS

Abstract

Abstract: Through the axial compression test of five GFRP columns (200 mm×200 mm×600 mm) with spiral stirrups and three GFRP columns (200 mm×200 mm×600 mm) with ordinary stirrups, the change rule of ultimate bearing capacity and ductility of GFRP columns with square sections under different stirrups is analyzed, so as to study the influence of spiral stirrups on the axial compression performance of GFRP columns with square sections. The test results indicate that the load-carrying capacity of longitudinal GFRP bars accounted for 3%~7% of the ultimate load-carrying capacity of the columns. The ultimate load-carrying capacity and ductility of GFRP columns with spiral stirrups increased by 0.8%~1.6% and 13%~33%, respectively, compared to GFRP hoops. Reducing the stirrup spacing may prevent the buckling failure of the longitudinal bars and increase the ductility and load-carrying capacity of the GFRP-RC columns. It has been found that setting the GFRP compressive strength to 35% of the GFRP maximum tensile strength yields a reasonable estimation of ultimate load-carrying capacity of GFRP-RC columns.

Key words: GFRP bars, concrete column, spirals, hoops, ultimate load-carrying capacity, composites

CLC Number:

TB332

TU Jian-wei, FU Jin-hai, GAO Kui, XIE Hua. AXIAL COMPRESSIVE PROPERTIES OF GFRP REINFORCED CONCRETE COLUMNS WITH SQUARE SPIRAL STIRRUPS[J]. Composites Science and Engineering, 2020, 0(8): 5-11.

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