自锁/楔片式锚具下碳纤维布加固RC圆柱预应力损失

doi:10.19936/j.cnki.2096-8000.20220828.001

复合材料科学与工程 ›› 2022, Vol. 0 ›› Issue (8): 5-14.DOI: 10.19936/j.cnki.2096-8000.20220828.001

• 基础研究 • 下一篇

自锁/楔片式锚具下碳纤维布加固RC圆柱预应力损失

卢春玲^1,2,3, 袁国华¹, 黄东发¹, 王强^1,2,3*

1.桂林理工大学土木与建筑工程学院,桂林541004;
2.广西岩土力学与工程重点实验室,桂林541004;
3.桂林理工大学广西有色金属隐伏矿床勘查及材料开发协同创新中心,桂林541004

收稿日期:2021-09-09 出版日期:2022-08-28 发布日期:2022-09-27
通讯作者: 王强(1979-),男,博士,副教授,主要从事结构加固、高性能混凝土方面的研究,632544958@qq.com。
作者简介:卢春玲(1978-),女,博士,教授,主要从事结构加固、结构风工程方面的研究。
基金资助:
国家自然科学基金项目(51568015);广西自然科学基金面上项目(2019GXNSFAA245055);广西创新驱动发展专项(桂AA20302006)

Prestress loss of RC columns reinforced with prestressed carbon-fiber reinforced polymer fabric using self-locking/wedge-cutting anchorages

LU Chun-ling^1,2,3, YUAN Guo-hua¹, HUANG Dong-fa¹, WANG Qiang^1,2,3*

1. College of Civil Engineering, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of Rock-soil Mechanics and Engineering, Guilin 541004, China;
3. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin 541004, China

Received:2021-09-09 Online:2022-08-28 Published:2022-09-27

摘要/Abstract

摘要： 针对自锁式锚具张拉碳纤维布持荷过程中损失较大的问题,本文开发了一种基于“楔削效应”的楔片式张拉锚固装置。在恒温恒湿条件下,对12组预应力碳纤维布加固RC柱进行了预应力损失试验研究。考虑了自锁/楔片式锚具、柱表面粗糙度、预应力度及是否二次张拉对预应力损失的影响,分析了张拉过程中碳纤维布与柱表面的相对滑动造成的摩擦损失和持荷过程中碳纤维布的预应力损失。试验结果表明:与自锁式锚具相比,采用楔片式锚具张拉碳纤维布可有效降低碳纤维布持荷过程中的预应力损失率,对碳纤维布的总预应力损失降幅最大达41.4%,涂胶可降低碳纤维布的摩擦损失和回缩引起的预应力损失,二次张拉可降低碳纤维布回缩引起的预应力损失。基于试验结果建立了应力损失计算公式,为碳纤维布预应力损失计算提供参考。

关键词: 碳纤维布, 预应力损失, 楔片式锚具, 自锁式楔片式锚具, 混凝土墩柱, 复合材料

Abstract: To solve the problem of large prestress loss of carbon-fiber reinforced polymer fabric during load-holding process using self-locking anchorage. We developed a wedge-type tensioning and anchoring device for carbon-fiber reinforced polymer fabric based on the "wedge-cutting effect". Under constant temperature and humidity conditions, 12 sets of prestressed carbon-fiber reinforced polymer fabric reinforced RC column specimens were tested. The effects of self-locking/wedge-cut anchorage, column surface roughness, prestress level and one-off/repeated tensioning on prestressing loss were considered, and the friction loss caused by the relative sliding of carbon-fiber reinforced polymer fabric and column surface during tensioning and the prestress losses of carbon-fiber reinforced polymer fabric during load holding were analyzed. The test results show that compared with the self-locking anchorage, the use of wedge-cut anchorage to tension carbon-fiber reinforced polymer fabric can effectively reduce the prestress losses ratio during the carbon-fiber reinforced polymer fabric load-holding process, which in turn can reduce the total prestress losses of carbon-fiber reinforced polymer fabric by up to 41.4%, and the glue coating can reduce the friction loss and prestress losses caused by elastic retraction of carbon-fiber reinforced polymer fabric, and the secondary tensioning can reduce the prestress losses caused by retraction of carbon-fiber reinforced polymer fabric. Based on the test results, the calculation formula of prestress losses is established, which provides a reference for the calculation of prestress losses of carbon-fiber reinforced polymer fabric.

Key words: carbon-fiber reinforced polymer fabric, prestress loss, self-locking anchorage, wedge-cut anchorage, concrete column, composites

中图分类号:

TB332

卢春玲, 袁国华, 黄东发, 王强. 自锁/楔片式锚具下碳纤维布加固RC圆柱预应力损失[J]. 复合材料科学与工程, 2022, 0(8): 5-14.

LU Chun-ling, YUAN Guo-hua, HUANG Dong-fa, WANG Qiang. Prestress loss of RC columns reinforced with prestressed carbon-fiber reinforced polymer fabric using self-locking/wedge-cutting anchorages[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(8): 5-14.

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自锁/楔片式锚具下碳纤维布加固RC圆柱预应力损失

Prestress loss of RC columns reinforced with prestressed carbon-fiber reinforced polymer fabric using self-locking/wedge-cutting anchorages

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