预应力碳纤维增强复材布加固大尺寸混凝土圆柱的应力损失试验研究  

EXPERIMENTAL RESEARCH ON STRESS LOSS OF LARGE-SIZED CONCRETE COLUMNS STRENGTHENED WITH PRESTRESSED CFRP SHEETS

作　　者：卢春玲[1,2,3] 张哲铭 李柏林 王鹏 LU Chunling;ZHANG Zheming;LI Bolin;WANG Peng(College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Rock-Soil Mechanics and Engineering,Guilin 541004,China;Guilin University of Technology,Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西岩土力学与工程重点实验室,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

出　　处：《工业建筑》2020年第6期175-182,共8页Industrial Construction

基　　金：国家自然科学基金项目(51568015);广西创新驱动发展专项(桂科AA18118008);广西岩土力学与工程重点实验室(2015-B-08)。

摘　　要：预应力碳纤维布(CFRPs)加固混凝土结构中预应力损失是影响加固效果的重要因素。为了研究预应力碳纤维布加固大尺寸混凝土圆柱时预应力损失的规律,通过自锁式锚具对碳纤维布进行环向加固。试验结果表明:摩擦损失为张拉过程中的主要损失,预应力越大、柱表面越粗糙、柱截面尺寸越大则摩擦损失值越大;持荷过程中为锚具变形、CFRPs布回缩与CFRPs布松弛产生的预应力损失;张拉过程中的摩擦损失占CFRPs布的总损失较大,为70.9%~80.8%,持荷后损失占总损失比例较小,为19.2%~29.1%;相同条件下直径1 m柱的CFRPs总损失比直径0.305 m柱的CFRPs总损失多17.1%~17.5%。在试验基础上,提出了张拉过程与持荷过程预应力损失计算表达式,为预应力损失计算提供参考。The prestress loss of concrete structure reinforced with prestressed carbon fiber reinforced plastics(CFRP)is an important factor affecting the reinforcing effect.In order to study the prestress loss law of large-sized concrete column strengthened with prestressed carbon fiber reinforced plastics(CFRP).According to the law,the CFRP was strengthened annularly by self-locking anchorage.The test results showed that friction loss was the main loss in tension process.The larger the prestress,the rougher the surface of the column and the larger the size of the section of the column,the greater the friction loss.The prestressing loss was caused by the deformation of anchorage,the shrinkage of CFRP sheets and the relaxation of CFRP sheets.The friction loss in tension process accounted for 70.9%to 80.8%of the total loss of CFRP sheets,while the loss after loading accounted for 19.2%to 29.1%of the total loss.Under the same conditions,the total CFRP loss of 1 m diameter column was 17.1%to 17.5%higher than that of 0.305 m diameter column.On the basis of experiments,the formulas for calculating the prestress loss during tension and loading were presented,which could provide a reference for calculating prestress loss.

关 键 词：碳纤维布 应力损失 锚具变形 弹性回缩 

分 类 号：TM37[电气工程—电机]