GFRP对不同断面形状混凝土柱约束性能试验研究

EXPERIMENTAL STUDY ON CONFINEMENT BEHAVIOR OF CONCRETE COLUMNS WITH VARIOUS SECTION SHAPES BY GFRP

在文献研究和工程调查的基础上 ,本文选用方形、圆形、八边形、直边加圆弧形和空心的配筋混凝土模型柱为研究对象 ,通过轴心受压试验所得到的荷载 轴向变形、荷载 纤维应变、荷载 -箍筋应变关系曲线以及相应对比分析 ,研究了GFRP对不同断面形状混凝土柱的约束性能。研究表明 ,断面形状对混凝土柱约束性能起着决定性作用。在其它条件相同的情况下 ,约束性能按照圆形、八边形、直边加圆弧形、方形。

On the basis of reference study and project investigation, this paper select ten concrete columns for the test with various section shapes of circle, square, octagon, straight edges with arc and hollow section. The influence of the section shapes on the concrete columns confined by GFRP is obtained according to the load-axial deformation curves, load-GFRP strain curves, load-stirrup strain curves picked up in the axial compression experiments and corresponding analysis. The research indicates that the section shape is one of the critical factors in the confinement performance. The confinement effect weakens gradually in the sequence of circle, octagon, straight edges with arc, square and hollow section shapes.