预应力碳纤维复合材料索增强混凝土T梁预应力损失研究  

Research on stress loss of prestressed carbon fiber composite cable reinforced concrete T beam

作　　者：王梓豪 李承高[1,2] 咸贵军 白洁[3,4] 熊浩[3,4] 许国文 WANG Zihao;LI Chenggao;XIAN Guijun;BAI Jie;XIONG Hao;XU Guowen(Key Lab of Structures Dynamic Behavior and Control,Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;China Construction Eighth Engineering Division Co.,Ltd.,Shanghai 200122,China;Research Center of Shanghai Carbon Fiber Composite Application Technology in Civil Engineering,Shanghai 200122,China)

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,哈尔滨150090 [2]哈尔滨工业大学土木工程学院,哈尔滨150090 [3]中国建筑第八工程局有限公司,上海200122 [4]上海碳纤维复合材料土木工程应用工程技术研究中心,上海200122

出　　处：《复合材料科学与工程》2023年第3期44-52,共9页Composites Science and Engineering

基　　金：中建股份科技研发计划资助(CSCEC-2020-Z-1);上海市科技计划项目资助(20DZ2253000)。

摘　　要：碳纤维复合材料筋因具有较高的抗拉强度、耐腐蚀与抗疲劳性能优异等特点而逐渐应用于混凝土预应力结构中。为了探究CFRP索增强混凝土T梁的预应力损失行为,本文制作了3根无黏结预应力CFRP索增强混凝土T梁,探究构件的预应力分布及张拉方法对预应力损失的影响。试验结果表明:预应力碳纤维复合材料索增强混凝土T梁的预应力由张拉端至锚固端逐渐减小,在CFRP索中直径小的CFRP筋预应力小且存在严重的应力不均匀现象;当采用分级张拉时,碳纤维复合材料索预应力损失量较小,而采用常规方式张拉时,预应力损失量显著上升,可以通过重复张拉的方法来消除部分应力损失。Carbon fiber reinforced composites(CFRP) bars are widely used in prestressed concrete structures due to their high tensile strength, corrosion resistance, and good fatigue properties. In order to explore the prestress loss behavior of CFRP cables reinforced concrete T beams, three unbonded prestressed CFRP cables reinforced concrete T beams were fabricated, prestress distribution of CFRP cable-reinforced concrete T beams and the effect of tensioning method on prestress loss was studied. The test results show that the prestress of the prestressed carbon fiber composite cable reinforced concrete T beam gradually decreases from the tension end to the anchor end, and the CFRP bars with small diameters in the CFRP cables have small prestress and serious stress unevenness. When using graded tension, the prestress loss of the carbon fiber composite cable is small. But when it is tensioned in conventional way, the prestress loss increases significantly, part of the stress loss can be eliminated by repeated tensioning.

关 键 词：CFRP索 预应力损失 应力监测 张拉方法 

分 类 号：TB332[一般工业技术—材料科学与工程]