| CFRP配筋超高性能混凝土柱受压性能试验 |
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| 引用本文： | 王启吾,方志,陈正.CFRP配筋超高性能混凝土柱受压性能试验[J].中国公路学报,2022,35(2):52-62. |
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| 作者姓名： | 王启吾 方志 陈正 |
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| 作者单位： | 1. 湖南大学 土木工程学院, 湖南 长沙 410082;2. 风工程与桥梁工程湖南省重点实验室, 湖南 长沙 410082;3. 林同棪国际工程咨询(中国)有限公司, 重庆 401121 |
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| 基金项目： | 国家自然科学基金重点项目(51938012) |
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| 摘 要： | 为明确碳纤维增强复合材料CFRP (Carbon Fiber-reinforced Polymer)配筋超高性能混凝土UHPC (Ultra-high-performance Concrete)柱的受力性能,对不同偏心率(e0/h0=0,0.15,0.3和0.6)下4根CFRP配筋UHPC柱试件进行受压性能试验研究,获...
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| 关 键 词： | 桥梁工程 超高性能混凝土 受压构件 CFRP筋 二阶效应 承载能力 |
| 收稿时间： | 2021-07-06 |
Compression Behavior of Ultra-high-performance Concrete Columns Reinforced with Carbon-fiber-reinforced Polymer Bars |
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| WANG Qi-wu,FANG Zhi,CHEN Zheng.Compression Behavior of Ultra-high-performance Concrete Columns Reinforced with Carbon-fiber-reinforced Polymer Bars[J].China Journal of Highway and Transport,2022,35(2):52-62. |
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| Authors: | WANG Qi-wu FANG Zhi CHEN Zheng |
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| Affiliation: | 1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;2. Key Laboratory for Wind and Bridge Engineering of Hunan Province, Changsha 410082, Hunan, China;3. T. Y. Lin International Engineering Consulting (China) Co. Ltd., Chongqing 401121, China |
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| Abstract: | 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. |
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| Keywords: | bridge engineering ultra-high-performance concrete compression member carbon fiber-reinforced polymer bar second-order effect carrying capacity |
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