海洋环境下CFRP及CFRP-混凝土界面性能的耐久性研究

发布时间：2018-01-19 04:06

本文关键词： CFRP 混凝土海水腐蚀力学性能粘结性能耐久性　出处：《大连理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：碳纤维增强塑性材料(Carbon Fiber Reinforced Plastic,简称CFRP)作为一种轻质高强、耐腐蚀的优良加固材料,已经成为工程结构加固领域中研究和应用的热点。工程师们发现,FRP加固结构的失效并不是由加固材料达到其极限状态导致的,而是由FRP与混凝土之间的剥离破坏造成的。对于港口和滨海地区的建筑物,钢筋混凝土结构长期处于海水浸泡的特殊环境中,不可避免的要受到海水的物理和化学侵蚀,造成钢筋混凝土结构产生各种缺陷而发生破坏。此外,位于北方的海工结构还要经受冰块撞击、冻融循环等不利因素的影响,大大加速了其破坏的进程。本文所做的工作就是在这样的背景下进行的,对海洋环境下的CFRP材料及CFRP与混凝土粘结的耐久性进行了试验研究,主要有以下几个方面： (1)对海洋环境下CFRP片材的耐久性进行了试验研究。42个CFRP片材在人工海水中进行了不同腐蚀时间的老化试验,通过拉伸试验测定了CFRP片材的物理力学性能,研究了CFRP力学性能随时间的变化规律。 (2)对海洋环境下CFRP-混凝土界面的破坏过程及破坏形态进行了研究。根据单剪试验现象详细的描述了CFRP-混凝土界面的破坏过程,并对其破坏形态进行了充分的阐述,分析了相应的破坏机理。 (3)对海洋环境下CFRP-混凝土界面粘结的耐久性进行了研究。本文根据单面剪切试验,对试件在不同控制条件下的界面粘结性能进行了深入研究,对比分析,得到了海水环境下CFRP-混凝土界面性能的变化规律。 (4)对海洋环境下CFRP-混凝土界面粘结滑移关系进行了研究。试验得到了界面剥离承载力,计算得到了界面粘结应力及CFRP与混凝土的相对滑移值,探讨了可以预测CFRP-混凝土试件的剥离承载力、有效粘结长度及CFRP-混凝土界面粘结滑移关系的本构模型。
[Abstract]:Carbon fiber reinforced plastic material (Carbon Fiber Reinforced Plastic, referred to as CFRP) as a kind of lightweight and high strength, excellent reinforcement corrosion resistant material, has become the focus of strengthening the research and application in the field of engineering structure. Engineers have found that the failure of the FRP reinforced structures and not by the reinforcement material reaches its limit state caused by, but debonding between FRP and concrete damage.
For ports and coastal areas of the building, reinforced concrete structures in the special environment of seawater immersion, inevitably affected by seawater physical and chemical erosion, caused by various defects of the reinforced concrete structure damaged. In addition, the building structures in the north also has ice impact effect of freeze-thaw cycles and other unfavorable factors, it will accelerate the process of destruction. The work of this paper is carried out under such a background, the durability of the marine environment, CFRP material and CFRP and concrete interface are studied, mainly in the following aspects:
(1) the durability of the marine environment under CFRP sheet was studied.42 CFRP sheets were aging test of different corrosion time in artificial seawater, physical and mechanical properties of CFRP sheet were investigated by tensile test, the mechanical properties of CFRP with the variation of time was studied.
(2) the failure process and failure mode of CFRP- concrete interface under marine environment are studied. According to the phenomenon of single shear test, the failure process of CFRP- concrete interface is described in detail, and the failure mode is fully elaborated, and the corresponding failure mechanism is analyzed.
(3) on the marine environment CFRP- bond durability of concrete interface was studied. Based on the single shear test, on the interfacial properties of specimens under different control conditions in-depth research, comparative analysis, obtained the variation of interfacial properties of CFRP- concrete under seawater environment.
(4) on the marine environment CFRP- concrete interfacial bond slip relationship was studied. Studied the interfacial debonding bearing capacity, calculate the interfacial bond stress and relative slip between CFRP and concrete, discusses the concrete specimens of CFRP- can predict the debonding strength, constitutive model of effective bond length and bond slip CFRP- the relationship between the concrete interface.

【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU37

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