循环荷载下FRP-混凝土粘结性能试验研究
首发时间:2011-04-14
摘要:本文设计了一组单剪试件,通过单剪试验,对FRP与混凝土在循环荷载下的粘结性能进行试验研究,分析不同的参数(包括FRP的长度及厚度、混凝土强度、加载速率和幅值等)对其粘结界面疲劳性能的影响,并系统研究FRP在循环荷载下剥离破坏的机理。试验结果表明,FRP粘贴长度、厚度,混凝土强度等对FRP与混凝土的粘结强度具有较大的影响。循环荷载的上限比例越高,这些参数对试件的疲劳性能影响越大。其中加载频率对FRP与混凝土粘结疲劳寿命有一定影响,循环荷载的加载频率越高,试件寿命越低。
关键词: 混凝土 纤维增强复合材料 循环荷载 单剪试验 粘结性能
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Experimental Study of Bond Behaviour Between FRP and Concrete Subjected to Cyclic Loading
Abstract:In this study, a set of direct shear test specimens are designed to study the bond performance of FRP and concrete subjected to cyclic loading. Different parameters, such as the rate and amplitude of loading, the length and thickness of FRP plate and concrete strength are studied to investigate their influence on fatigue properties of bond behaviour between FRP and concrete. The mechanism of FRP debonding from concrete substrate under cyclic loading is systematically studied. Experimental results indicate that most parameters affect the fatigue properties of FRP-to-concrete interface mainly through their effect on the bond capacity between FRP and concrete. It is also found that frequency of the cyclic load has great effect on the fatigue performance of FRP-to-concrete interface.The fatigue life of the specimens decreases with the load frequency.The higher the upper value of the cyclic loading, the greater effect on the fatigue performance of the FRP-to-concrete interface these parameters can cause.
Keywords: Concrete FRP Cyclic Loading Direct Shear Test Bond Performance
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No.4420978579279130****
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