求取内嵌FRP加固混凝土梁界面滑移量的一种新方法

曾宪桃1,2 任振华1,2 鄢芡1

(1.湖南工程学院建筑工程学院, 湖南湘潭 411104)
(2.风电装备与电能变换协同创新中心, 湖南湘潭 411104)

【摘要】FRP筋与混凝土之间界面的粘结性能是FRP筋混凝土结构中最关键的力学特性,要准确预测FRP-混凝土的剥离破坏,必须确定合适的黏结滑移关系。为建立相对准确的界面粘结滑移模型,在提出内嵌CFRP筋加固混凝土梁界面特性研究新的试验方法的基础上,开展了11根混凝土梁的四点弯试验。借助岩石中树脂锚杆与锚固剂界面的剪应力模型,导出了CFRP筋横断面上轴向正应力沿CFRP筋锚固长度分布的解析式,进而得到CFRP筋锚固段的伸长量,结合试验获得的CFRP筋指定截面测定的滑移量、外露CFRP筋的伸长量,最后得到了CFRP筋与混凝土界面的滑移量,绘制了CFRP筋-混凝土界面的粘结-滑移曲线。试验和分析计算表明,新构建的CFRP筋与混凝土界面滑移量的求取方法,混凝土-CFRP筋界面的滑移量及粘结-滑移曲线准确简单,省去了在CFRP筋上密贴应变片的麻烦,排除了应变片对界面受力的干扰,对CFRP筋-混凝土界面的特性研究具有示范指导作用。

【关键词】 内嵌FRP; 混凝土; 界面; 本构关系; 新方法;

【DOI】

【基金资助】 国家自然科学基金项目(51678430) National Natural Science Foundation of China(51678430) 湖南省自然科学基金项目(2017JJ4016,2018JJ4042) Hunan Natural Science Foundation Project(2017JJ4016,2018JJ4042)

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This Article

ISSN:1004-4574

CN: 23-1324/X

Vol 28, No. 04, Pages 13-21

August 2019

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摘要

  • 1 试验和新方法的思路
  • 2 l2段滑移量δu的确定
  • 3 结论
  • 参考文献