FRP约束方形截面钢筋混凝土偏压长柱的试验研究

以偏心率为变化参数,共进行了8个长细比Lb为20.4的方形截面钢筋混凝土偏心受压长柱的试验,其中有4个试件沿环向包裹了单向FRP(纤维增强复合材料),另4个未包裹FRP的试件用作力学性能对比。试验结果表明,在长细比较大的情况下,FRP约束虽没有明显提高方形偏压柱的承载力,但在一定程度上改善了构件的延性,尤其是对偏心距较小的构件。当需要同时提高方形截面长柱承载力及延性的时候,建议采用双向FRP对构件进行包裹,或采取其他有效措施。

EXPERIMENTAL BEHAVIOR OF FRP-CONFINED SQUARE RC LONG COLUMNS UNDER ECCENTRIC LOADING

A total of eight specimens with slenderness ratio of 20.4 were tested to investigate the performance of eccentrically loaded square reinforced concrete (RC) columns. These eight columns included four unstrengthened columns, and four columns strengthened by FRP jackets. The main parameter varied in the tests was the load eccentricity. The experimental results demonstrated that the bearing capacities can not be enhanced effectively, but the ductility can be improved to some extent,especially for specimens with small eccentricities. If there is a need to enhance both bearing capacity and ductility of square RC long column, it is recommended that bi-directional FRP sheets should be used, or some other effective measures should be taken.