CFRP筋粘结式楔型锚具锚固性能分析
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摘要
为研究CFRP筋粘结式楔型锚具锚固性能及其影响因素,对12套CFRP筋粘结式楔型锚具进行静载试验,以锚具内倾角和锚固长度为变化参数,获取锚具试件荷载—滑移全过程曲线,推出锚具内部CFRP筋与环氧树脂砂浆界面粘结—滑移本构模型。研究表明:增大锚具内倾角和锚固长度可提高锚具极限荷载,平均粘结强度随锚具内倾角的增大呈增大趋势,临界锚固长度随试件锚具内倾角的增大呈减小趋势,采用回归公式计算的平均粘结强度值与试验实测值比较接近;锚固长度是影响界面粘结剪切刚度的主要因素;锚固长度和锚具内倾角可一定程度提高界面抗滑移能力,损伤发展后期,锚固长度越大,损伤速率越慢;推导出的锚具内CFRP筋与环氧树脂砂浆的粘结—滑移本构关系模型适用性较好。
For the study of the anchoring performance and influencing factors of bond anchor for CFRP tendons, 12 sets of bond anchors for CFRP tendons were designed for static load test.Two test parameters of internal inclination of anchorage and anchorage length were considered to study their influences on the load-slip behaviors of bond anchor for CFRP tendons.Load-slip curve and the bond-slip constitutive model between CFRP tendons and epoxy resin mortar were obtained.The results show that the ultimate load of the anchorage can be increased by increasing the internal inclination of anchorage and anchorage length.The average bond strength increases with the increase of the internal inclination of anchorage, and the critical anchorage length decreases with the increase of the internal inclination of anchorage.The value of average bond strength calculated by regression formula is similar to the experiment value.Increasing the anchorage length is beneficial to the bonding shear stiffness of the interface.Anchorage length and internal inclination of anchorage can improve the anti-slip capacities of the interface.In the later stage of damage, the anchorage length increase as the damage rate decrease.The bond-slip constitutive model between CFRP tendons and epoxy resin mortar in anchorage agree with the experimental results.
For the study of the anchoring performance and influencing factors of bond anchor for CFRP tendons, 12 sets of bond anchors for CFRP tendons were designed for static load test.Two test parameters of internal inclination of anchorage and anchorage length were considered to study their influences on the load-slip behaviors of bond anchor for CFRP tendons.Load-slip curve and the bond-slip constitutive model between CFRP tendons and epoxy resin mortar were obtained.The results show that the ultimate load of the anchorage can be increased by increasing the internal inclination of anchorage and anchorage length.The average bond strength increases with the increase of the internal inclination of anchorage, and the critical anchorage length decreases with the increase of the internal inclination of anchorage.The value of average bond strength calculated by regression formula is similar to the experiment value.Increasing the anchorage length is beneficial to the bonding shear stiffness of the interface.Anchorage length and internal inclination of anchorage can improve the anti-slip capacities of the interface.In the later stage of damage, the anchorage length increase as the damage rate decrease.The bond-slip constitutive model between CFRP tendons and epoxy resin mortar in anchorage agree with the experimental results.
引文
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[16] 高丹盈,朱海堂,谢晶晶.纤维增强塑料筋混凝土粘结滑移本构模型[J].工业建筑,2003,33(7):41-43.
[2] 周兆鹏,李飞,赵启林.FRP筋粘结型锚具研究进展[J].工业建筑,2011,41(增刊1):663-666.
[3] MEI K H,SUN S J,LI B,et al.Experimental investigation on the mechanical properties of a bond-type anchor for carbon fiber reinforced polymer tendons[J].Composite Structures,2018,201:193-199.
[4] 薛伟辰,刘华杰,王小辉.新型FRP筋粘结性能研究[J].建筑结构学报,2004,25(2):104-109.
[5] NANNI A,BAKIS C E,DIXON T O,et al.Performance of FRP tendon anchor systems for pre-stressed concrete structures[J].PCI Journal,1996,41(1):34-43.
[6] 吕志涛,梅葵花.国内首座CFRP索斜拉桥的研究[J].土木工程学报,2007,40(1):54-59.
[7] 诸葛萍,叶华文,强士中,等.CFRP丝股锚固体系试验研究及受力分析[J].工程力学,2011,28(7):165-170.
[8] 蒋田勇.CFRP预应力筋及拉索锚固系统的试验研究和理论分析[D].长沙:湖南大学,2008.
[9] 中华人民共和国国家发展和改革委员会.环氧树脂砂浆技术规程:DL/T 5193—2004[S].北京:中国电力出版社,2004.
[10] 中华人民共和国国家质量监督检验检疫总局.定向纤维增强塑料拉伸性能试验方法:GB 3354—2014[S].北京:中国标准出版社,2014.
[11] 侯苏伟,龙佩恒,诸葛萍,等.CFRP索股粘结型锚具锚固机理试验[J].中国公路学报,2013,26(5):95-101.
[12] 方志,余庭嘉,方亚威,等.CFRP绞线黏结式锚具静力性能试验研究[J].建筑结构学报,2018,39(6):168-174.
[13] 方志,龚畅,杨剑.CFRP预应力筋黏结式锚固系统的抗疲劳性能[J].公路交通科技,2012,29(7):58-63.
[14] 蔡四维,蔡敏.混凝土的损伤断裂[M].北京:人民交通出版社,1999:73-76.
[15] COSENZA E,MANFREDI G,REALFONZO R,et al.Behavior and modeling of bond of FRP bars to concrete[J].Journal of Composites for Construction,1997,1(2):40-51.
[16] 高丹盈,朱海堂,谢晶晶.纤维增强塑料筋混凝土粘结滑移本构模型[J].工业建筑,2003,33(7):41-43.