多束平行碳纤维复合材料拉索锚固系统的承载性能研究  

Research on Bearing Performance of Multi-Bundle Parallel CFRP Cable Anchorage System

作　　者：王梓豪 李承高[1,2] 咸贵军 熊浩[3,4] 白洁[3,4] 许国文 WANG Zihao;LI Chenggao;XIAN Guijun;XIONG Hao;BAI Jie;XU Guowen(Key Lab of Structures Dynamic Behavior and Control,Harbin Institute of Technology,Ministry of Education,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：《工业建筑》2022年第9期18-27,共10页Industrial Construction

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

摘　　要：碳纤维增强树脂(CFRP)复合材料相较于钢绞线具有轻质高强、耐腐蚀、耐疲劳、抗蠕变等优异性能,用于土木工程结构,可以减轻结构自重,延长结构寿命。单向CFRP材料具有典型正交各向异性特征,其抗剪及横向抗压性能较差,导致CFRP材料的锚固成为难题。本文采用试验与有限元模拟的方法,对多束平行碳纤维增强树脂复合材料拉索锚固系统的静载性能及应力分布进行了研究。研究结果表明:当采用多锥形锚具锚固多束CFRP平行拉索时,锚具导致的应力集中会损伤荷载端CFRP筋表面,导致CFRP拉索承载力下降;提出以黏结滑移本构表征CFRP筋与环氧树脂界面行为的有限元模拟方法,研究了CFRP拉索的破坏模式和应力分布情况,揭示了锚具挤压对CFRP拉索损伤的影响机制,预测了CFRP拉索的极限锚固承载力;最后,通过对锚具系统优化发现,增加CFRP拉索的锚固长度,可将锚固系统的锚固效率由70%提升至90%以上。Compared with the steel wires,carbon fiber reinforced polymer(CFRP)composite has the excellent properties,such as light weight,high strength,superior corrosion,fatigue and creep resistance.When CFRP are used in civil engineering structures,the weight of the structures can be reduced and life can be prolonged.Unidirectional CFRP has the typical orthotropic characteristics with poor shear and transverse compressive properties,which makes the anchorage of CFRP to become a difficult problem.In this paper,the experiment and finite element simulation were used to study the bearing performance and stress distribution of multi-bundle parallel carbon fiber cables anchorage system.The results showed that when the multi-cone anchors were used to anchor multi-bundle parallel carbon fiber cables,the stress concentration caused by the anchors would destory the surface of the CFRP bars at the load end,resulting in a decrease of bearing capacity of the CFRP cables.A finite element simulation method was proposed with the interface behavior of CFRP bars and epoxy resin characterized by bond-slip constitutive.The failure modes and stress distribution of anchorage system of CFRP cable were studied,the damage mechanism of carbon fiber cable caused by the anchor extrusion was revealed,and the ultimate bearing capacity of anchorage of CFRP cables was predicted.Finally,through optimizing the anchorage system,it was found that increaseing anchoring length for carbon fiber cable could improve the anchoring efficiency of the anchoring system from 70%to 90%.

关 键 词：CFRP拉索 锚固体系 锚固机制 破坏模式 有限元分析 

分 类 号：TU476[建筑科学—结构工程]