CFRP索股粘结型锚具锚固机理试验  

Experiment on Mechanism of Bond-type Anchor for CFRP Cables

作　　者：侯苏伟[1] 龙佩恒[1] 诸葛萍[2] 刘明虎[3] 

机构地区：[1]北京建筑大学工程结构与新材料北京市高校工程研究中心,北京100044 [2]宁波大学建筑工程与环境学院,浙江宁波315211 [3]中交公路规划设计院有限公司,北京100088

出　　处：《中国公路学报》2013年第5期95-101,共7页China Journal of Highway and Transport

基　　金：国家高技术研究发展计划("八六三"计划)项目(2008AA11Z101)

摘　　要：通过分析传统内锥式碳纤维增强塑料(CFRP)索股粘结型锚具的锚固机理,提出锚固区CFRP索股内外层丝轴向拉应力分布不均匀,以及受荷端附近CFRP丝受到弯折及挤压应力过大等不利因素导致锚具锚固性能较差,据此提出改进措施是在受荷端锚筒内部预留一定长度不浇筑粘结剂或对锚具预紧。通过轴向静力拉伸试验,分别对传统及改进后锚具的锚固性能及影响因素进行研究,试验索股采用19根Ф5的CFRP丝。结果表明:预紧力对提高锚固性能作用很大;丝间距越小锚固效率系数越高;试件长于1.6m时,长度对锚固性能的影响不大;受荷端锚筒内部预留一定长度不浇筑粘结剂,能解决受荷端附近CFRP丝受到弯折的问题;改进后锚具极限承载力为857.2kN,对应的锚固效率系数提高到101.1%,比传统锚具提高了近20%。Theoretical analysis of mechanical behaviors of conventional in-cone bond-type anchors for CFRP cables showed that the low anchorage efficiency was caused by the following factors： the different axial tensile force distributions between the outer and center wires, and the CFRP wires with the bending problem and overlarge compression at the loading side. The conventional anchors were improved based on theoretical analysis. Two improvements were made： the use of unfilled resin at the loading side and preloading measure. Axial static tensile tests were conducted to investigate the anchorage performances of the conventional anchors and the improved anchors, and the influence of various parameters. The cable of the experimental anchorage system contained 19 CFRP wires of ~5. The results show that the preloading measure significantly improves the anchorage performance; the anchoring efficiency increases with the decrease of the wire spacing; specimen length affects anchorage performance slightly when the length exceeds 1.6 m; the use of unfilled resin at the loading side can solve the bending problem of the CFRP wires at the loading side; the ultimate capacity of the specimen with improved anchors is 857.2 kN, and the anchoring efficiency factor reaches 101. 1%, increasing nearly 20% compared with the conventional anchors.

关 键 词：桥梁工程 CFRP索股锚具 静力拉伸试验 锚固效率系数 极限承载力 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]