预应力CFRP筋弯曲极限承载力理论与试验研究
PDF下载 (353)蔡万赟,王航宇,吴秀勇,夏嘉君,诸葛萍.预应力CFRP筋弯曲极限承载力理论与试验研究[J].宁波大学学报(理工版),2022,35(6):47-53.DOI:
CAI Wanyun,WANG Hangyu,WU Xiuyong,XIA Jiajun,ZHUGE Ping.Theoretical and experimental study on bending ultimate bearingcapacity of prestressed CFRP bars[J].Journal of Ningbo University(Natural Science & Engineering Edition),2022,35(6):47-53.DOI:
| Title: | Theoretical and experimental study on bending ultimate bearingcapacity of prestressed CFRP bars |
| 作者: | 蔡万赟, 王航宇, 吴秀勇, 夏嘉君, 诸葛萍 |
| Author(s): | CAI Wanyun, WANG Hangyu, WU Xiuyong, XIA Jiajun, ZHUGE Ping |
| 关键词: | 预应力; 碳纤维复合材料筋; 弯曲半径; 张拉效率; 极限承载力 |
| Keywords: | prestress; CFRP bars; bending radius; tension efficiency; ultimate bearing capacity |
| 分类号: | U444 |
| 文献标识码: | A |
| 摘要: | 为了得到碳纤维复合材料(Carbon Fiber-reinforced Polymer, CFRP)筋弯曲状态下的极限承载力, 开展了不同直径的CFRP筋在不同弯曲半径下抗拉极限承载力研究. 首先, 根据前人的理论公式, 分析CFRP筋直径和弯曲半径对弯曲抗拉强度的影响, 在此基础上建立CFRP筋在弯曲状态下极限承载力的理论计算模型; 其次, 利用建立的模型对2种不同直径的CFRP筋在3种不同弯曲半径下的弯曲极限承载力进行测试, 并将测试结果与理论模型计算结果进行对比, 验证理论模型的正确性; 最后, 通过CFRP筋弯曲状态下极限承载力理论计算模型, 对不同直径和弯曲半径的CFRP筋弯曲极限承载力进行预测. 结果表明 在相同弯曲半径下, CFRP筋的弯曲极限强度随其直径的增大而减小; 在相同直径下, CFRP筋的弯曲极限强度随其弯曲半径的增大而增大; 当弯曲半径大于5m时, 直径为10mm和12mm的CFRP筋的张拉效率均超过90％. 本文所建立的理论计算模型的计算结果与试验结果吻合较好, 可用于预测不同弯曲工况下CFRP筋的极限承载力. |
| Abstract: | In order to obtain the ultimate bearing capacity of carbon fiber reinforced polymer (CFRP) bars under bending state, the ultimate tensile bearing capacity of CFRP bars with different diameters under different bending radii was studied. Firstly, the influence of the diameter and bending radius of CFRP bars on the bending tensile strength is analyzed based on existing theoretical formulas, and on this basis, the theoretical model of the ultimate bearing capacity of CFRP bars under bending state is established. Secondly, the bending ultimate bearing capacity of two different diameters of CFRP bars under three different bending radii is tested by model test, and the computational results are compared with the experimental results to verify the theoretical model. Finally, the bending ultimate bearing capacity of CFRP bars with different diameters and bending radius is predicted by the theoretical model of the ultimate bearing capacity of CFRP bars under the bending state. The results show that under the same bending radius, the bending ultimate strength of CFRP bars decreases with the increase of its diameter; and under the same diameter of CFRP bars, the bending ultimate strength of CFRP bars increases with the increase of its bending radius; when the bending radius is greater than 5m, the tensile efficiency of 10mm and 12mm CFRP bars can exceed 90％. The computational result is in good agreement with the experimental result. Hence the theoretical model established in this paper can be used to predict the ultimate bearing capacity of CFRP bars under different bending conditions. |
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| 备注/Memo: | 收稿日期:2022-04-12.宁波大学学报（理工版）网址:http://journallg.nbu.edu.cn/ 基金项目:国家自然科学基金（52078256）;浙江省基础公益计划（LGF22E080023）. 第一作者:蔡万赟（1998－）,男,浙江温州人,在读硕士研究生,主要研究方向:桥梁工程.E-mail:512036084@qq.com *通信作者:诸葛萍（1982－）,男,浙江温州人,教授,主要研究方向:桥梁工程.E-mail:zhugeping@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
