| 基于梁式试验的CFRP布-混凝土界面粘结滑移模型研究 |
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| 引用本文： | 王新玲,;杨佳佳,;孙宏运,;李可,;康现栋.基于梁式试验的CFRP布-混凝土界面粘结滑移模型研究[J].地震学刊,2014(3):314-319. |
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| 作者姓名： | 王新玲 ;杨佳佳 ;孙宏运 ;李可 ;康现栋 |
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| 作者单位： | [1]郑州大学土木工程学院,郑州450002; [2]东南大学土木工程学院,南京210096 |
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| 基金项目： | 河南省重点科技攻关项目（132102310277）资助 |
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| 摘 要： | 设计了CFRP布-混凝土界面粘结性能的梁式试验方案,考虑高强混凝土和CFRP布加固量对粘结滑移关系的影响,设计制作5个试件,进行了静载作用下的试验。试验结果显示,试件均发生混凝土内聚破坏的剥离破坏,拉下约1-5mm混凝土层。绘出了CFRP布表面应变的分布曲线和粘结滑移曲线。曲线显示,荷载较小时,随着距加载端距离的增加,CFRP布表面应变明显降低;开始剥离后,最大应变即剥离向自由端发展;粘结滑移曲线分上升段、下降段。基于试验数据,给出了最大粘结剪应力τmax和界面破坏能Gf的表达式,在已有模型的基础上,提出了适用于高强混凝土的CFRP布-混凝土界面粘结滑移模型。
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| 关 键 词： | CFRP布-混凝土粘结滑移模型 梁式试验 应变 剪应力 |
Experimental Study on Bond-slip Model for CFRP-concrete Interface Based on Beam Test |
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| Institution: | WANG Xin-ling , YANG Jia-jia , SUN Hong-yun , LI Ke , KANG Xian-dong (1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450002, China ; 2. School of Civil Engineering, Southeast University, Nanjing 210096, China) |
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| Abstract: | Beam test program was designed for study on bond-slip performance of CFRP-concrete interface. Static load test on 5 beam specimens has been carried out considering the impact of high-strength concrete and strengthening amount of CFRP sheet. Debonding occurred within the concrete for all specimens, pulling down about 1-Smm layer of concrete. Based on test results, CFRP surface strain distribution and bond-slip curve were presented, before peeling, with the increase of the distance from the loading end, the CFRP cloth surface strain significantly reduced. After peeling, the maximum strain moved toward the free end. The bond-slip curve is divided into two phases： ascent stage and decline stage. The formulas of maximum bond shear stress rmox and interracial failure energy Gf were derived. Based on existing bond-slip model, the bond-slip model for CFRP-concrete was proposed and applied to high strength concrete. |
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| Keywords: | CFRP-concrete bond-slip model~ beam test strain~ shear stress |
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