CFRP索股单孔直筒+内锥粘结型锚具的受力性能分析  

Mechanical Performance Analysis of One Tube Composite Bonding-Type Anchorage of CFRP Tendons

作　　者：贾丽君[1] 张川 丛霄[1,2] JIA Lijun;ZHANG Chuan;CONG Xiao(School of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute (Group) Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《华南理工大学学报（自然科学版）》2019年第9期98-106,共9页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51878488);上海市科学技术委员会项目(16ZR1441700)~~

摘　　要：为研究CFRP碳纤维增强复合材料粘结型锚具的受力性能及其设计参数对锚固效率的影响,寻求较优的锚具设计参数取值范围,本研究首先采用有限元方法,通过引入锚固效率的概念,研究了单孔直筒+内锥粘结型锚具的力学性能及索股径向应力和位移分布规律.然后,以锚固效率和等效刚度为考察指标,改变锚具及索股参数,分析了锚具总长度、粘胶介质弹性模量、直筒段长度、内锥角大小、胶体厚度、索股直径参数对锚固效率及等效刚度的影响规律.结果显示:锚具总长度宜取为12~16倍CFRP索股直径;粘结胶弹性模量取1.5~3.0 GPa;直筒段长度取为总长度的1/6~1/2之间;内锥角取4°~5°;胶体厚度取CFRP筋直径的0.3~0.5倍;索股直径取值宜小于90 mm.在建议参数取值下,单孔直筒+内锥粘结型锚具的锚固效率将达到90%,甚至95%以上.因此,合理优化相关设计参数能较好地提高其锚固效率和刚度.Mechanical performance,transversal stress and displacement of one tube composite bonding-type anchorage was analyzed by using finite element method and introducing the concept of anchorage efficiency.The aim is to investigate the mechanical performance of bonding-type anchorage as well as the parameters’ effects on the anchorage efficiency,to find out the optimized parameters of anchors,and to solve the problems of anchorages and promote the applications of CFRP(Carbon Fiber Reinforced Polymer) in large-span bridges.Furthermore,based on the concept of anchorage efficiency and equivalent stiffness,the effects of anchors’ length,elastic modulus of bond medium,length of straight tube,inner angle of barrel,thickness of tube as well as diameters of CFRP tendons on the anchorage efficiency were studied by changing the parameters of models.Results show that the anchors’ length is suggested to be 12 to 16 times of the diameters of CFRP tendons;the elastic modulus of bond medium is suggested to be 1.5 GPa to 3.0 GPa;the length of straight tube is suggested to be 1/6 to 1/2 of anchors’ length;the inner angle of barrel is suggested to be 4° to 5°;the thickness of medium is suggested to be 0.3 to 0.5 times of diameters of CFRP tendons;the diameters of CFRP tendons is suggested to be less than 90 mm.Under the suggested parameters,the anchorage efficiency can reach 90%~95% or even more.Hence,it does help to promote the anchorage efficiency and equivalent stiffness by optimizing the parameters of anchors.

关 键 词：桥梁工程 CFRP锚固性能 有限元方法 粘结型锚具 

分 类 号：U444[建筑科学—桥梁与隧道工程] TU52[交通运输工程—道路与铁道工程]