新型CFRP索股锚固体系设计及试验研究
Design and Experimental Research on Novel CFRP Wire Strand Anchoring System
贾丽君 1张文超 1徐利平 1裴辉腾2
作者信息
- 1. 同济大学桥梁工程系,上海 200092
- 2. 同济大学桥梁工程系,上海 200092;江西省交通设计研究院有限责任公司,南昌 330052
- 折叠
摘要
为改善CFRP索股锚固体系的锚固性能及CFRP索股受力不均问题,研制了锚具内壁面带凹槽的CFRP索股锚固体系,对其进行了试验测试,分析了锚固体系破坏模式、荷载-位移、锚固效率、CFRP索股应变变化规律,通过应力变异系数评估了锚具内壁面凹槽设置和预张拉对CFRP索股应力不均匀改善的效果.研究结果表明,锚具内壁面设置凹槽和对CFRP索股进行预张拉能够提高锚固体系的锚固效率,锚固效率可达99%以上;试验观察到CFRP索股存在受力不均现象,引起CFRP索股受力不均的原因主要与CFRP索股长度不一致和粘结介质的剪切变形相关;通过在锚具内壁面设置凹槽和对CFRP索股进行预张拉能够改善锚固体系CFRP索股的应力不均程度,锚具内壁面凹槽深度为2 mm、间距为5 mm,预紧力为10%名义极限荷载时,锚固体系在自由段中点和加载端处的平均应力变异系数分别降低了7.16%、3.86%.
Abstract
To enhance the anchoring performance and address uneven stress distribution in CFRP tendons within anchoring systems,this study developed an anchoring system with grooved inner walls for CFRP tendons.Experimental tests were conducted to analyze failure modes,load-displacement relationships,anchoring efficiency,and CFRP tendon strain variations.The effects of grooved inner walls and pre-tensioning on improving the uneven stress distribution of CFRP tendons were assessed using the stress variation coefficient.The results demonstrate that grooved inner walls and pre-tensioning of CFRP tendons can significantly improve the anchoring efficiency of the system,achieving efficiencies exceeding 99%.Experimental observations identified uneven stress distribution in CFRP tendons,primarily attributed to variations in tendon length and shear deformation of the bonding medium.Implementing grooved inner walls and pre-tensioning of CFRP tendons effectively mitigated stress unevenness in the anchoring system.Specifically,with grooves at a depth of 2 mm and spaced 5 mm apart,and a pre-tensioning force of 10%of the nominal ultimate load,the average stress variation coefficient at the midpoint and loading end of the free segment of the anchoring system decreased by 7.16%and 3.86%,respectively.
关键词
CFRP索股锚固体系/锚固性能/静载试验/破坏模式/应力不均匀Key words
CFRP wire strand anchoring system/anchoring performance/static load test/failure mode/uneven stress引用本文复制引用
基金项目
国家自然科学基金(51878488)
江西省交通厅科技项目(2024ZG002)
江西省交通厅科技项目(2023H0008)
出版年
2024
国家科技期刊平台
NSTL
万方数据