CFRP圆钢管混凝土短柱偏压试验研究

Experimental Study on Eccentrically Compressed Concrete Filled Circular CFRP Steel Tubular Columns

为研究圆截面CFRP钢管混凝土短柱的偏压受力性能,对11根环向全包裹CFRP圆钢管混凝土短柱进行偏压试验,研究不同混凝土强度、含钢率、CFRP层数和偏心率对其极限承载力的影响。试验结果表明:圆截面CFRP钢管混凝土偏压短柱的破坏形态表现为受压区的钢管屈曲和中部及中上部的CFRP断裂。试件达到极限承载力后在经历较大变形的同时仍然可以保持一定的承载能力,属于延性破坏。极限承载力随着试件偏心率的增加而减小;混凝土强度、含钢率和CFRP层数的增加可以有效提升试件的极限承载力,其中CFRP层数的提升最为显著。

In order to study the eccentric compression performance of CFRP circular concrete-filled steel tube short columns,eccentric compression tests were carried out on 11 CFRP circular concrete-filled steel tube short columns,and to study the influence of different concrete strength,steel ratio,CFRP layer number and eccentricity on its ultimate bearing capacity.The results showed that the failure modes of CFRP round concrete-filled steel tube stub columns under eccentric load are shown as buckling of the steel tube in the compression zone and CFRP fracture in the middle and upper part.After the specimen reaches the ultimate bearing capacity,it can still maintain a certain bearing capacity while undergoing greater deformation,which is a ductile failure.The ultimate bearing capacity of the specimen decreases with the increase of eccentricity;The increase in concrete strength,steel content and the number of CFRP layers can effectively increase the ultimate bearing capacity of the specimen,and the increase in the number of CFRP layers is the most significant.