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Experimental Study on the Axial Compression Performance of Damaged Concrete Column Reinforced by CFRP Sheets

Zhu Jun-tao;Wang Xin-ling;School of Civil Engineering,Zhengzhou University;  
12 concrete columns with different damage degree,reinforced by CFRP sheets with two reinforcement rates of 30% and50%,under axial compression are tested. The compression performance of damaged concrete columns confined with CFRP sheets under loading state is studied,and the influence of damage degree,primary stress and reinforcement rate on the mechanical performance and failure characteristics of concrete columns is analyzed. Tests and analysis results show that the compressive bearing capacity and ductility of the specimens with the same damage degree increase with the increment of CFRP sheets reinforcement rate,and the compressive bearing capacity of the specimens with the same CFRP sheets reinforcement rate will decrease with the increment of column damage degree,while the compressive bearing capacity drops rapidly when the damage degree more than 0. 6. Moreover,only the CFRP reinforcement rate no less than 50%,the ultimate bearing capacity and ductility can be improved with the constrain function of CFRP sheets.
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