冻融循环作用下不同埋深的嵌贴CFRP-混凝土界面粘结性能的试验研究

发布时间：2018-04-14 14:32

本文选题：冻融循环 + 表层嵌贴　；参考：《实验力学》2016年06期

【摘要】：通过18个表层嵌贴CFRP-混凝土拔出试件的试验,考察了不同冻融循环次数下有着不同CFRP埋深的试件的粘结承载力、破坏模式以及CFRP的应变分布等,分析了不同冻融循环次数下嵌贴CFRP-混凝土界面的粘结行为;以及在冻融循环作用下,不同CFRP板条埋深对嵌贴CFRP粘结性能的影响。试验结果表明:随着冻融循环次数的增加,试件的破坏模式由CFRP板的拉断破坏转变为试件粘结界面的破坏,试件的粘结承载力呈下降趋势,冻融侵蚀对CFRP-混凝土界面粘结性能产生了明显的劣化作用;在室温环境下,CFRP埋置深度对CFRP-混凝土界面粘结性能影响不明显;在冻融循环作用下,CFRP板条埋置深度为10mm时,其CFRP-混凝土界面粘结性能受冻融循环侵蚀的劣化作用较其他试件更明显。
[Abstract]:In this paper, the bond bearing capacity, failure mode and strain distribution of CFRP under different freezing and thawing cycles were investigated by 18 specimens with CFRP- concrete.The bond behavior of CFRP- concrete interface under different freeze-thaw cycles and the effect of different depth of CFRP slab on the bond properties of CFRP are analyzed.The test results show that with the increase of freeze-thaw cycle times, the failure mode of the specimen changes from tensile failure of CFRP plate to the failure of the bond interface of the specimen, and the bond bearing capacity of the specimen decreases.Freezing and thawing erosion has obvious deterioration effect on the interfacial bond performance of CFRP- concrete, the depth of CFRP-concrete interfacial bond is not obvious at room temperature, and when the depth of CFRP-concrete embedded under freeze-thaw cycle is 10mm, the interfacial bond behavior of CFRP-concrete is not affected by the depth of CFRP-concrete.The interfacial bond behavior of CFRP- concrete is more obvious than that of other specimens due to freeze-thaw cycle erosion.
【作者单位】：长沙理工大学土木与建筑学院;长沙理工大学南方地区桥梁长期性能提升技术国家地方联合工程实验室;
【基金】：国家自然科学基金(51578078) 国家重点基础研究发展计划项目(973)课题(2015CB057701) 长沙市科技计划项目(K1508020-31) 长沙理工大学土木工程优势特色重点学科创新性项目(16ZDXK10)
【分类号】：TU398.9

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