基于摩擦和胶接机理的混合锚固技术的研究

纤维增强复合材料加固的一般施工方法是利用树脂类胶结材料将FRP片材粘贴于混凝土表面,从而达到对结构构件补强加固及改善结构受力性能的目的。但是此种方法在利用FRP加固结构时,容易发生FRP-混凝土界面的早期剥离破坏,从而导致其加固效果受到限制,无法充分利用FRP的高强材料特点。为了解决上述破坏问题,本文研究一种新型的FRP片材粘结锚固技术,即基于摩擦和胶接机理的混合锚固技术(简称FAHB)。本文利用ANSYS软件对FAHB进行了非线性有限元分析,并与常规单粘结锚固技术进行对比。结果表明,FAHB粘结锚固技术可以有效避免整体粘结失效,从而显著提高构件的极限承载力,较单粘结锚固技术具有明显优势。

Research on Mixed Bond Technique based on Frictio and Adhesion Hybrid Bond

Usually the existing reinforced concrete structures can be strengthened by adhering fiber-reinforced plastic to the concrete surface to improve their mechanical performances.However,the strengthening effect of this construction method is limited because of its easily happening debonding failure,so the high-strength material characteristics of FRP can not be taken full advantage.In order to solve the above problems,this paper studied a new type of FRP bond technology which is based on the friction-adhesion on the condition of hybrid bond technique.Non-linear finite element analysis with ANSYSTM is carried out to investigate the stress distribution and load-bearing capacity of strengthened beams based on FAHB and ordinary bond technique respectively.The results show that FAHB can avoid the sudden total failure of bonding,thereby improving dramatically the load-bearing capacity of strengthened beams,which have obvious advantages compared with ordinary bond technique.