碳纤维编织网与聚丙烯纤维水泥基复合材料加固混凝土短圆柱的轴压试验及承载力计算

杨卓宇; 黄海林; 高亚强; 谭永杰

doi:10.3724/j.gyjzG23092008

碳纤维编织网与聚丙烯纤维水泥基复合材料加固混凝土短圆柱的轴压试验及承载力计算

doi: 10.3724/j.gyjzG23092008

1. 湖南科技大学土木工程学院, 湖南湘潭 411201;
2. 湖南科技大学湖南省智慧建造装配式被动房工程技术研究中心, 湖南湘潭 411201;
3. 湖南智谷投资发展集团有限公司, 长沙 410017

基金项目:

湖南科技创新计划项目(2023SK2014)

湖南省教育厅优秀青年项目(19B188)

湖南省自然科学基金青年基金项目(2018JJ3161)。

详细信息

作者简介:
杨卓宇,硕士研究生,主要从事基于织物增强混凝土的既有结构修复与加固研究,782755969@qq.com。

通讯作者:
黄海林,博士,教授,主要从事基于织物增强混凝土的既有结构修复与加固研究,hhlvsgenius@163.com。

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出版历程
- 收稿日期: 2023-09-20
- 网络出版日期: 2024-06-24

Axial Compressive Tests and Bearing Capacity Calculations for Short Circular Concrete Columns Strengthened with Woven Carbon Fiber Mesh and Polypropylene Fiber-Reinforced Cement-Based Composite Materials

1. College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. Hunan Engineering Research Center for Intelligently Prefabricated Passive House, Hunan University of Science and Technology, Xiangtan 411201, China;
3. Hunan Zhigu Investment and Development Group Co., Ltd., Changsha 410017, China

摘要

摘要: 通过对14个基于碳纤维编织网与聚丙烯纤维水泥基复合材料加固混凝土短圆柱的轴压性能试验,得到各试件的极限承载力和破坏形态,给出了各试件平均压应力-混凝土应变曲线、平均压应力-碳纤维编织网应变曲线及各试件极限承载力柱状图,分析了加固层水泥基复合材料中聚丙烯纤维含量、碳纤维编织网包裹层数及网格大小等参数对试件轴压性能及破坏机理的影响。试验结果表明:采用碳纤维编织网与聚丙烯纤维水泥基复合材料加固混凝土短圆柱可明显提高其极限承载力;试件主要破坏形态为纵向压劈破坏,脆性破坏特征明显;在小掺量情况下,加固层中聚丙烯纤维含量(质量比为0.05%,0.15%,0.25%)的改变对试件承载力的影响不明显;在一定范围内试件承载力随碳纤维编织网包裹层数的增加而提高;相比于边长为2 cm的方网格碳纤维编织网,边长为1 cm的方网格碳纤维编织网对试件承载力的提高效果更好。在引入4个合理的基本假定和2个强度模型的基础上,提出碳纤维编织网与聚丙烯纤维水泥基复合材料加固混凝土短圆柱的轴压承载力计算方法。采用该计算方法及相关文献的计算方法得到的理论计算值与试验结果进行比较,表明:采用所建议计算方法得到的理论计算值与试验结果吻合较好,且理论计算值均小于试验值,说明该计算方法具有一定安全储备。
- 碳纤维编织网 /
- 聚丙烯纤维水泥基复合材料 /
- 混凝土短圆柱 /
- 轴压试验 /
- 承载力计算
Abstract: Axial compressive tests of 14 short circular concrete columns strengthened with woven carbon fiber mesh and polypropylene fiber-reinforced cement-based composite materials were conducted. The ultimate bearing capacity and damage pattern of each specimen were obtained, the curves between average compressive stress and concrete strain, the curves between average compressive stress and strain of woven carbon fibers mesh, and the ultimate bearing capacity histogram of each specimen were given. The effects of parameters such as the polypropylene fiber content in the reinforced cement-based composite material, the number of layers and the grid sizes on the axial compressive performances and damage mechanisms of specimens were analyzed. The test results showed that the ultimate bearing capacity of the short circular columns reinforced with woven carbon fiber mesh and polypropylene fiber-reinforced concrete could be significantly improved; in the case of a small mass content, the changes in the polypropylene fiber content (with a mass content of 0.05%, 0.15%, 0.25%) in the reinforced layer had a little effect on the bearing capacity of specimens; the bearing capacity of specimens in a certain range increased with the number of layers of woven carbon fiber mesh. The bearing capacity of specimens increased with the increase in the number of wrapped layers of woven carbon fiber mesh; compared with the mesh with the grid of 2 cm×2 cm, the mesh with the grid of 1 cm×1 cm was more effective in improving the bearing capacity of specimens. By introducing four reasonable basic assumptions and two strength models, the calculation method of the axial compressive bearing capacity for composite reinforced columns with woven carbon fiber mesh and polypropylene fiber-reinforced cement-based composite materials was proposed. The theoretical calculated values obtained by the proposed method and the calculation methods from related literatures were compared with the test results, and the results showed that the theoretical values calculated by the proposed method were in good agreement with the test results, and the theoretical values were smaller than the test values. It was indicated that the proposed formula had certain safety reserve.
- woven carbon fiber mesh /
- polypropylene fiber-reinforced cement-based composite material /
- short circular concrete column /
- axial compressive test /
- bearing capacity calculation

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