CFRP筋粘结型锚固系统疲劳及应力松弛性能研究
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摘要
在三个应力水平及三个应力幅值下对CFRP筋粘结型锚固系统进行拉-拉及弯曲疲劳试验,对200万次疲劳加载后未发生破坏的试验件进行静载拉伸破坏试验,对CFRP筋粘结型锚固系统进行应力松弛性能研究。研究结果表明:研发出的单孔CFRP筋锚固系统疲劳性能优良,经历200万次的拉-拉或弯曲疲劳加载后,锚固系统没有任何损伤,疲劳加载后筋材的强度基本没有变化,弹性模量略有提高,平均提高幅度为4. 3%;提出并建立的CFRP筋锚固系统应力松弛性能预测模型与试验数据吻合良好,预测1000 h锚固系统的应力松弛率的误差为4. 64%;提出的CFRP筋的应力松弛性能研究方案可以有效消除锚固段内胶体变形对CFRP筋应力松弛性能测试带来的影响,获得CFRP筋1000 h应力松弛率为0. 67%。
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.
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.
引文
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[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 tendonanchor 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.
[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,BJRN 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 tendonanchor 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.
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