循环荷载作用下CFRP-混凝土粘结性能试验研究*
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马涛, 潘金龙, 魏红雳(东南大学混凝土及预应力混凝土结构教育部重点实验室， 南京 210096)［摘要］设计了一组单剪试件，通过单剪试验，对CFRP与混凝土在循环荷载作用下的粘结性能进行试验研究，分析不同的参数（包括CFRP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，并系统研究了CFRP在循环荷载作用下剥离破坏的机理。试验结果表明，CFRP粘贴长度、厚度和混凝土强度等对CFRP与混凝土的粘结强度有较大影响；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CFRP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; 粘结性能中图分类号：TU528.572 文献标识码：A 文章编号：1002-848X(2013)19-0015-04Experimental study of bond behavior between CFRP and concrete under cyclic loadingMa Tao, Pan Jinlong, Wei Hongli(Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China)Abstract: A set of direct shear test specimens were designed to study the bond behavior between CFRP and concrete under cyclic loading. Different parameters, including length and thickness of CFRP plate, concrete strength and the rate and amplitude of loading were studied to investigate fatigue properties of bond behavior between CFRP and concrete. The mechanism of CFRP debonding from concrete under cyclic loading was systematically studied. Experimental results indicate that length and thickness of CFRP plate and concrete strength affect the fatigue properties. The large peak value of the cyclic loading increase the effect of parameters on the fatigue performance of the CFRP-to-concrete interface. It is also found that frequency of the cyclic loading has great effect on the fatigue performance of CFRP-to-concrete interface, which is in inverse proportion to the life of the specimens.Keywords: concrete; CFRP; cyclic loading; direct shear test; bond behavior*教育部博士点基金(20070286024)，国家自然青年基金（50808043），江苏省六大人才高峰资助计划（NO2011-JZ-010）。通讯作者：潘金龙，教授，博导，Email: jinlongp@gmail.com。参考文献［1］HOLLAWAY LEONARD, LEEMING MICHAEL B. Strengthening of reinforced concrete structures: using externally bonded-FRP composites in structural and civil engineering［M］. Cambridge, UK: Woodhead Publishing, 1999.［2］叶列平, 冯鹏. FRP在工程结构中的应用与发展［J］. 土木工程学报, 2006, 39(3): 25-36.［3］INOUE SHOICHI, NISHIBAYASHI SHINZO, YOSHINO AKIRA, et al. Strength and deformation characteristics of reinforced concrete beam strengthened with carbon fiber reinforced plastics plate under static and fatigue loading［J］. Zairyo Journal of the Society of Materials Science, 1994, 43(491): 1004-1009.［4］TOUTANJI H, DENG Y, JIA M. Fatigue performance of RC beams strengthened with CF sheets bonded by inorganic matrix［C］//FRPRCS-6. Singapore, 2003: 2837-2851.［5］SHAHAWY MOHSEN, BEITELMAN THOMAS E. Static and fatigue performance of RC beams strengthened with CFRP laminates［J］. Journal of Structural Engineering, 1999, 125(6): 613-621.［6］陆焜, 邱洪兴, 庞林飞. 碳纤维布加固钢筋混凝土受弯构件的疲劳性能研究［J］. 工业建筑, 2005, 35(S1): 962-972.［7］姚国文. 常幅循环载荷下纤维薄板增强钢筋砼梁的损伤行为研究［J］. 机械强度, 2004, 26(S): 25-27.
