对曲 anchored CFRP 电缆疲劳能力的实验研究
Jingyu Wu1,2, Yongquan Zhu3, Chenggao Li4,5,6
1College of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China.
Polymers
|June 10, 2023
概括
碳纤维增强聚合物 (CFRP) 电缆具有曲 anchoring系统,具有出色的疲劳抵抗力. 这些系统在经过广泛的疲劳测试后显示出高余强度和最小损坏,证明它们适用于桥梁结构.
科学领域:
- 材料科学 材料科学 材料科学
- 结构工程 结构工程
- 机械工程 机械工程
背景情况:
- 碳纤维增强聚合物 (CFRP) 电缆越来越多地用于桥梁建设.
- 曲固系统对于CFRP电缆的性能至关重要.
- 了解这些系统中的CFRP杆的疲劳行为和损伤机制是必不可少的.
研究的目的:
- 实验研究CFRP杆在曲固CFRP电缆中的疲劳性能.
- 为了评估固性能和曲固系统的额外剪切效应.
- 用声辐射技术监测微观损伤的进展.
主要方法:
- 对CFRP棒的疲劳刚度,寿命和残余强度的实验研究.
- 对宏观损伤的启动,扩张和断裂的分析.
- 使用声波发射来监测微观损伤.
- 在各种疲劳负荷条件下进行测试,包括200万个循环.
主要成果:
- 在200万次循环后,CFRP棒在500MPa和600MPa应力幅度下保持了95.1%和76.7%的残余强度.
- 曲固的CFRP电缆在200万循环下没有显著的疲劳损伤,最大应力为0.4 σult和500 MPa的幅度.
- 在恶劣条件下,纤维分裂和压缩剪切断裂被确定为主要损伤模式,剪切效应对疲劳耐力至关重要.
结论:
- 曲 anchoring 系统显示了 CFRP 电缆的良好的疲劳承受能力.
- 曲 anchoring 的额外的剪切效应是影响疲劳抵抗的一个关键因素.
- 这些发现支持优化曲 anchoring系统,以提高耐疲劳性,并促进桥梁中CFRP电缆的应用.
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