关键词: BFRP条带, BFRP纵筋, 海水海砂混凝土, 圆柱试件, 轴压性能, 承载力

Abstract: In order to study the axial compression behavior of a new type of sea water sea-sand concrete circular column reinforced by BFRP longitudinal bars and confined by continuous BFRP spiral strip，also with concrete cover，8 short columns were test under axial compressive load.The influence of reinforcement ratio of BFRP longitu-dinal bars and the width and spacing of BFRP spiral strip on the axial compression performance of the columns was studied.According to the study results，the failure process and mechanism of such new type of column are that the concrete cover cracks and fell off first at middle of its height，then the spiral strips were fractured，finally the core concrete was crushes and the BFRP longitudinal bars are buckling；the damage ranges of concrete covers of the specimens confined by strips are smaller than that of the specimen without strip confining；the BFRP spiral strips can provide some constraint effect on the core concrete and BFRP longitudinal bars and improve the utilization rate of the compressive strength of BFRP bars；the bearing capacity of the new type of column increases with the increase of reinforcement ratio of BFRP longitudinal bars；under the restraint of the strips，the bearing capacity of the specimens is increased by 0.9%~10.4%，and the ultimate displacements is increased by 16.39%~130.82%；reducing the spacing or increasing the width of strips can improve the bearing capacity of the column；the displacement ductility coefficients of the specimens are generally not high.The calculated values from the expression for predicting the axial compression bearing capacity of such column derived in this paper are in good agreement with the experimental values.

Key words: BFRP strip, BFRP longitudinal bar, seawater sea-sand concrete, circular column specimen, axial compression behavior, bearing capacity