Compression Behavior of Ultra-high-performance Concrete Columns Reinforced with Carbon-fiber-reinforced Polymer Bars

被引：0
作者：
Wang Q.-W. [1 ]
Fang Z. [1 ,2 ]
Chen Z. [3 ]
机构：
[1] College of Civil Engineering, Hunan University, Changsha
[2] Key Laboratory for Wind and Bridge Engineering of Hunan Province, Changsha
[3] T. Y. Lin International Engineering Consulting (China) Co. Ltd., Chongqing
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 35卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Bridge engineering; Carbon fiber-reinforced polymer bar; Carrying capacity; Compression member; Second-order effect; Ultra-high-performance concrete;
D O I：
10.19721/j.cnki.1001-7372.2022.02.004
中图分类号：
学科分类号：
摘要：
Four carbon-fiber-reinforced polymer (CFRP)-reinforced ultra-high-performance concrete (UHPC) columns with different eccentricities (e0/h0=0, 0.15, 0.3, and 0.6) were tested to investigate the behavior of UHPC columns reinforced with CFRP bars. The effects of the eccentricities on the behavior of the UHPC columns were analyzed, and calculation formulas of the eccentricity magnifying coefficient and bearing capacity of CFRP-reinforced UHPC columns were devised. The results show that the failure mode of the tested CFRP-reinforced UHPC columns is the crushing failure of the UHPC in the compression zone. The columns generally have brittle failure characteristics with the fracture of the CFRP bars in the compression zone after UHPC crushing. With the increase in eccentricity, the bearing capacity of the columns decreased gradually and the lateral deflection and member ductility increased gradually. The lower elastic modulus of the CFRP bars and the larger ultimate compressive strain of UHPC makes the eccentricity magnifying coefficient of the columns more evident owing to the second-order effect; moreover, the tensile effect of UHPC in the tensile zone of the section decreases correspondingly. When the bearing capacity of CFRP-reinforced UHPC columns with compression failure is predicted, if the eccentricity is not greater than 0.3, the contribution of UHPC in the tensile zone can be ignored. When the eccentricity exceeds 0.3, the tensile effect of UHPC in the tensile zone of the section should be considered to reflect the favorable effect of the higher tensile strength of the UHPC. At this time, the equivalent stress reduction coefficient k of UHPC in the tensile zone is recommended to be 0.2. The test results verify the applicability of the proposed formulas for calculating the eccentricity magnifying coefficient and bearing capacity of the CFRP-reinforced UHPC columns. © 2022, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：52 / 62
页数：10
相关论文
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