内嵌CFRP筋加固混凝土试件粘结性能研究

发布时间：2018-01-08 15:40

本文关键词：内嵌CFRP筋加固混凝土试件粘结性能研究　出处：《河南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：内嵌复合材料(FRP)加固构件能改善建筑物的受力方式,提高建筑物的承载力、耐久性、防火性能等,具有一定的发展前景。为确保加固效果,就需要对加固材料的性能及共同工作的粘结性能进行研究。目前,内嵌加固的工程应用较多,但其粘结理论研究还存在不足。因此,本文提出了内嵌CFRP筋加固混凝土试件粘结性能的研究。通过直接拔出试验,对混凝土强度、开槽形状、粘结长度不同试验参数下加固构件的受力性能、破坏模式等做出了研究,主要研究工作及结论如下:(1)开展14根内嵌CFRP筋加固试件的拔出试验,详细描述不同参数下混凝土试件的变形、开裂过程,确定试件的粘结机理和破坏模式。结果表明:试件发生了混凝土槽开裂破坏、拉剪破坏、剪切-劈裂破坏,其中以剪切-劈裂破坏为主。(2)着重分析混凝土强度、粘结长度及开槽尺寸对试件承载力、剪应力的影响。结果表明:混凝土强度越高,试件的粘结承载力和剪应力也越高;粘结长度越长,承载力越高,局部最大剪应力越高,试件平均剪应力越低;槽宽对试件的开裂荷载有一定的影响。(3)基于直接拔出试验结果,得出各系列试件的局部剪应力、极限荷载对应的粘结滑移量,拟合局部粘结剪应力-滑移曲线图,并确定了最大滑移量。
[Abstract]:FRP) can improve the bearing capacity, durability, fire resistance and so on of the building. It has a certain development prospect in order to ensure the reinforcement effect. It is necessary to study the properties of the strengthening materials and the bond properties of the joint work. At present, there are many engineering applications of embedded reinforcement, but there are still some deficiencies in the research of the bond theory. In this paper, the bond behavior of concrete specimens strengthened with embedded CFRP bars is studied. Through the direct pull-out test, the mechanical behavior of the strengthened members under different test parameters such as strength, slotted shape and bond length is studied. The main research work and conclusions are as follows: 1) the pull-out tests of 14 specimens strengthened with CFRP bars are carried out, and the deformation of concrete specimens under different parameters is described in detail. The cracking process, the bonding mechanism and the failure mode of the specimens are determined. The results show that the specimens have cracking failure, tensile and shear failure, and shear-splitting failure. Among them, shear-splitting failure is the main part.) the influence of concrete strength, bond length and slotted size on the bearing capacity and shear stress is analyzed. The results show that the higher the concrete strength is, the higher the concrete strength is. The bond strength and shear stress of the specimens are also higher. The longer the bond length is, the higher the bearing capacity is, the higher the local maximum shear stress is, the lower the average shear stress is. Based on the results of direct pull-out test, the local shear stress of each series of specimens and the bond-slip corresponding to ultimate load are obtained. The local bond shear stress-slip curve was fitted and the maximum slip value was determined.
【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37

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