外包钢与碳纤维布复合加固钢筋混凝土偏压柱试验研究

通过14根被加固钢筋混凝土柱的偏心受压试验,研究了碳纤维布和角钢以及两者复合加固后混凝土柱的破坏特征、受力性能和破坏机理。分别对不同含碳纤维布率、含角钢率、长细比和偏心距下被加固混凝土柱的极限承载力、应力-应变关系以及刚度和延性等方面进行了研究和分析。研究结果表明:复合加固混凝土柱充分发挥了碳纤维布和角钢加固混凝土柱的各自优点,并使它们能协调工作、共同作用,获得优良的力学性能,同时复合加固柱的承载力和延性均优于碳纤维布和角钢单一加固柱。长细比越小、偏心距越小、含CFRP率和含角钢率越高,则柱承载力越高,延性提高效果越好。

Experimental research on RC eccentric compression column strengthened with the combination of CFRP and angle steel

Fourteen reinforced concrete columns strengthened with carbon fiber reinforced plastic(CFRP) or angle steel and a combination of both subjected to eccentric compression were tested.The failure types,performance characteristics and confinement mechanism of the confined columns are demonstrated in detail.The influences of ultimate strength,stress-strain relationship,stiffness and ductility of concrete columns in different conditions were researched and analyzed,the conditions include different CFRP ratios,angle steel ratios,slenderness ratios and eccentricities.The test results indicated that the jointly strengthened columns embrace the advantages both of the columns strengthened with CFRP and of those strengthened with angle steel,make them work harmonically,and achieve excellent characteristics of mechanics.The jointly strengthened columns excel the separately strengthened columns in ultimate load-bearing capacity and ductility.The decrease of slenderness ratio and eccentricity as well as the increase of CFRP ratio and angle steel ratio are all of advantage to the ultimate load-bearing capacity and ductility of the eccentric compression columns.