不同锚具下预应力CFRP布加固混凝土方柱预应力损失  

Prestress loss of prestressed CFRP fabric reinforced concrete square column by different anchorage

作　　者：黄东发 李健 卢春玲[1,2,3,4] 王强 HUANG Dongfaa;LI Jian;LU Chunling;WANG Qiang(College of Civil Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi,Guilin University of Technology,Guilin 541004,China;Guangxi Engineering Research Center of Intelligent Structural Material,Guilin University of Technology,Guilin 541004,China;Road&Bridge South China Engineering Co.,Ltd.,Zhongshan 528400,China)

机构地区：[1]桂林理工大学土木工程学院,广西桂林541004 [2]桂林理工大学广西绿色建材与建筑工业化重点实验室,广西桂林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,广西桂林541004 [4]桂林理工大学广西壮族自治区智慧结构材料工程研究中心,广西桂林541004 [5]中交路桥华南工程有限公司,广东中山528400

出　　处：《桂林理工大学学报》2025年第1期57-65,共9页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(52468041);广西自然科学基金面上项目(2023GXNSFAA026337);广西绿色建材与建筑工业化重点实验室基金项目(22-J-21-10)。

摘　　要：自锁式锚具张拉CFRP布加固混凝土方柱时CFRP布与锚具间滑移较大,造成了较多预应力损失,为了提高预应力CFRP布加固混凝土柱有效横向约束力关键技术问题,设计并提出一种楔片式锚具张拉CFRP布,对12组预应力CFRP布加固混凝土方柱进行了考虑不同锚具类型、柱表面处理、预应力水平和张拉次数对CFRP布预应力损失试验。结果表明:与自锁式锚具对比,楔片式锚具张拉CFRP布持荷过程预应力损失率减小达40.7%,其中CFRP布回缩损失最为明显,降低幅度达68.4%;柱表面涂胶处理后降低了摩擦损失,进行二次张拉,CFRP布持荷过程预应力损失有效降低。根据实测数据建立理论计算公式,预应力CFRP布加固混凝土方柱的应力损失计算值与试验结果吻合较好。For concrete columns reinforced by prestressed CFRP fabric,how to improve its effective transverse binding force is a key technology problem.When adopting self-locking anchorages to tension concrete columns wrapped with prestressed CFRP fabric,the slip between CFRP fabric and anchorage is large,thereby causing more prestress loss.Therefore,a new type of wedge anchorage is used to tension concrete columns reinforced by prestressed CFRP fabric.Under constant temperature and humidity conditions,the prestress loss tests of 12 groups concrete columns with prestressed CFRP fabric are carried out,and the test period is 168 h.The influences of different anchorage types,surface treatment,prestress level and number of tensioned on the prestress loss of CFRP fabric are considered.The test results indicate that compared with the self-locking anchorage,the prestress loss of CFRP fabric under wedge anchorage is reduced by 40.7%during load-holding,and the reduced of shrinkage loss of CFRP fabric is the most obvious,the reduction ratio is up to 68.4%.The friction loss of the column surface treated with glue is reduced,and the prestress loss of CFRP fabric during load-holding process greatly reduced during secondary tension.The formula is established by the measured data,which has a certain reference value for predicting the stress loss of concrete square columns strengthened with prestressed CFRP fabric.

关 键 词：楔片式锚具 CFRP布 预应力损失 混凝土方柱 

分 类 号：TU378.8[建筑科学—结构工程]