EXPERIMENTAL RESEARCH ON FATIGUE CHARACTERISTICS AND STRESS RELAXATION OF ADHESIVE ANCHORAGE SYSTEM FOR CFRP TENDON

Abstract

Abstract: The tensile fatigue and bending fatigue behaviour of CFRP tendon adhesive anchorage system were tested under three kinds of stress levels and stress amplitudes. The tensile strength of CFRP tendon anchorage system was tested after two million fatigue cycles. And the stress relaxation of CFRP tendon anchorage system was studied. Test results show that the CFRP tendon anchorage system developed is stable and reliable. The anchorage system is free of any damage after two million tensile fatigue or bending fatigue cycles. The tensile strength of CFRP tendon after fatigue test is almost unchanged, and the modulus increase by 4.3% in average. The model for predicting stress relaxation of CFRP tendon anchorage system was proposed and agreed with the measured values. The error in predicting the stress relaxation rate of the anchorage system for 1000 hours is 4.64%. The testing program for stress relaxation of CFRP tendon was proposed, and the stress relaxation rate of the CFRP tendon for 1000 hours is 0.67%, which could effectively avoid the effect of anchor adhesive deformation.

Key words: carbon fiber reinforced polymer tendon, adhesive anchorage system, fatigue characteristics, residual strength, stress relaxation

CLC Number:

TB332

ZHU Yuan-lin, LIU Li-hua, ZHOU Jia-qi, HUANG Sheng-bin. EXPERIMENTAL RESEARCH ON FATIGUE CHARACTERISTICS AND STRESS RELAXATION OF ADHESIVE ANCHORAGE SYSTEM FOR CFRP TENDON[J]. Fiber Reinforced Plastics/Composites, 2019, 0(3): 11-15.

References

[1] 杜善义. 先进复合材料与航空航天[J]. 复合材料学报, 2007, 24(1): 1-12.
[2] 王成忠, 李鹏, 杨小平, 等. 碳纤维复合材料筋的研制与性能研究[J]. 施工技术, 2005, 34(7): 37-39.
[3] 黎小平, 张小平, 王红伟. 碳纤维的发展及应用现状[J]. 高科技纤维与应用, 2005, 30(5): 24-30.
[4] Zhang B R, Benmokrane B. Design and evaluation of a new bond type anchorage system for fiber reinforced polymer tendons[J]. Canadian Journal of Civil Engineering, 2004, 31(1): 14-26.
[5] 张继文, 朱虹, 吕志涛, 等. 预应力FRP筋锚具的研发[J]. 工业建筑, 2004, 34(1): 259-262.
[6] 蒋田勇, 方志. CFRP筋粘结式锚具锚固性能测试[J]. 中国公路学报, 2011, 24(1): 68-77.
[7] 刘荣桂, 刘德鑫, 延永东. CFRP筋复合型锚固锚固性能研究[J]. 建筑科学与工程学报, 2013, 30(2): 9-14.
[8] Noisternig J F. Carbon fibre composites as stay cables for bridges[J]. Applied Composite Materia, 2000(7): 139-150.
[9] Zhang B R, Benmokrane B. Design and evaluation of a new bond type anchorage system for fiber reinforced polymer tendons[J]. Canadian Journal of Civil Engineering, 2004, 31(1): 14-26.
[10] 崔冰, 董萌, 贾立峰, 等. 一种新型悬索桥主缆锚固系统设计概念综述[J]. 中国工程科学, 2013, 15(8): 12-17.
[11] Jacob W S, Anders B, BJRN T et al. Mechanical anchorage of FRP tendons-A literature review[J]. Construction and Building Materials, 2012, 32: 110-121.
[12] 余庭嘉, 方志. CFRP绞线粘结式锚具的静力试验研究[J]. 中外公路, 2017, 37(1): 124-128.
[13] Nanni A, Bakis C E, Dixon T O. Performance of FRP tendon-anchor systems for prestressed concrete structures[J]. PCI Journal, 1996, 41(1): 34-43.
[14] 张夏辉. 碳纤维增强预应力筋锚具的设计研究[D]. 济南: 山东大学, 2009.
[15] 孙志刚. 碳纤维预应力筋及拉索锚固系统抗疲劳性能的试验研究[D]. 长沙: 湖南大学, 2005.
[16] Hamid S, Fares E T. Relaxation, creep, and fatigue behavior of carbon fiber reinforced plastic tendons[J]. ACI Materials Journal, 1999, 96(2): 143-153.
[17] Ahmed E, Jeffrey S W, Khaled S. Performance of CFRP tendon-anchor assembly under fatigue loading[J]. Composite Structures, 2007, 80(3): 352-360.
[18] 涂晓佩, 张保敏, 李重情. 碳纤维材料在桥梁加固中应用的探索研究[J]. 纤维复合材料, 2008, 25 (1): 25-27.
[19] Patrick X W Z. Long-term properties and transfer length of fiber-reinforced polymers[J]. Journal of Composites for Construction, 2003, 7(1): 10-19.
[20] 朱元林, 刘礼华, 张继文, 等. 碳纤维复合材料筋在不同锚固填料中的锚固性能试验研究[J]. 玻璃钢/复合材料, 2015(7): 78-82.