FRP约束钢筋混凝土圆柱力学性能的试验研究

Experimental behavior of FRP-confined circular RC columns

以长细比和偏心率为变化参数,共进行了16个圆形截面钢筋混凝土柱试验,其中8个试件在环向包裹了FRP(纤维增强复合材料),另8个试件未包裹FRP,以作力学性能对比。试验结果表明,由于FRP的约束作用,包裹FRP试件较相应未包裹FRP试件的承载力提高14%～68%,同时延性也有不同程度的提高,证明FRP约束对提高钢筋混凝土柱(包括长柱及偏压柱)力学性能的有效性。最后,提供了环向包裹FRP后圆形截面钢筋混凝土柱承载力计算方法,计算结果和试验结果基本吻合。

A total of sixteen specimens were tested to investigate the performance of eccentrically loaded circular reinforced concrete columns strengthened by wrapping fiber reinforced polymer (FRP) sheets. These sixteen columns included eight unstrengthened columns and eight columns strengthened with FRP jackets. The main parameters varied in the tests were the slenderness ratio and the load eccentricity. The load carrying capacity of the test specimens were found to be increased by 14 to 68 percent as a result of FRP wrapping and ductility improvements to different degrees were also observed demonstrating the effectiveness of FRP confinement. A simple method was given to predict the load carrying capacity of FRP confined RC columns. In general, the predicted results agree well with the column test results.