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Experiment on Eccentrically Compression of Middle Long Columns of Concrete-filled Square Steel Tube with Inner CFRP Circular Tube

LI Guo-chang,HAN Liu (School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,Liaoning,China)  
Upon the contrast test of bearing capacities of ten columns of high-strength concrete-filled square steel tubes with inner carbon fiber reinforced polymer(CFRP) circular tube and four columns of high-strength concrete-filled square steel tubes,the influences of different parameters on the performance of test specimens were studied,from the analysis of test curves.The conclusion can be drawn that under the precondition of same slenderness ratio,the eccentricity increases,and the bearing capacity of column of high-strength concrete-filled square steel tube with the same content of CFRP reduces.Under the precondition of the same eccentricity and the same slenderness ratio,the content of CFRP increases,and the bearing capacity of the column of high-strength concrete-filled square steel tube obviously increases.The restraint effect on the core concrete increases,the yield time of structural member is prolonged.Under the precondition of the same eccentricity and the same content of CFRP,the slenderness ratio increases,and the bearing capacity of the column of high-strength concrete-filled square steel tube obviously reduces.The test results make good preparations for further formula derivation and research.
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