本文關(guān)鍵詞： CFRP 粘結(jié)滑移 靜力 疲勞 單、雙剪試驗(yàn)　出處：《長沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：CFRP作為一種新型材料,以其輕質(zhì)高強(qiáng)、耐腐蝕性等特點(diǎn)已經(jīng)被研究者成功運(yùn)用到土木工程行業(yè),并取得了一定的成果。然而從CFRP加固結(jié)構(gòu)的破壞模式來看,發(fā)生CFRP與加固材料的界面剝離是常見的破壞形式,CFRP加固效果與界面粘結(jié)性能有著密切的關(guān)系。因此在研究FRP-混凝土結(jié)構(gòu)中,CFRP與混凝土界面粘結(jié)性能成為研究的重要課題。本文以CFRP-混凝土結(jié)構(gòu)單剪和雙剪試驗(yàn)為基礎(chǔ),研究了CFRP-混凝土結(jié)構(gòu)界面靜力和疲勞下的界面粘結(jié)性能,并討論關(guān)鍵參數(shù)的影響,進(jìn)而為CFRP-混凝土加固結(jié)構(gòu)提供重要的設(shè)計(jì)和理論依據(jù)。本文主要的研究內(nèi)容如下：(1)通過CFRP-混凝土單剪試驗(yàn),研究了不同膠層厚度、混凝土強(qiáng)度、CFRP粘結(jié)長度對界面粘結(jié)性能的影響,同時(shí)擬合得到了界面破壞能、最大剪切應(yīng)力與膠層剪切剛度及混凝土強(qiáng)度之間的函數(shù)關(guān)系式�；赥.ueda模型,進(jìn)行CFRP剛度及界面破壞能修正,從而得到本試驗(yàn)粘結(jié)滑移本構(gòu)關(guān)系式。(2)從影響界面粘結(jié)滑移的三個(gè)重要參數(shù)(初始界面剪切剛度、局部最大界面剪切應(yīng)力、界面破壞能)出發(fā),利用有限元分析考察三個(gè)重要參數(shù)對界面粘結(jié)性能的影響,同時(shí)保持三個(gè)重要參數(shù)不變,考察粘結(jié)滑移曲線形狀對界面粘結(jié)性能影響。(3)以陸新征粘結(jié)滑移承載力模型為基礎(chǔ),結(jié)合了本試驗(yàn)得到的界面破壞能公式,對CFRP剛度進(jìn)行了修正,考慮有效粘結(jié)長度、寬度修正系數(shù)在內(nèi)的影響,以期得到修正性的考慮多種影響極限承載力因素的承載力計(jì)算公式。(4)通過CFRP-混凝土雙剪疲勞試驗(yàn),以雙線性粘結(jié)滑移簡化模型為基礎(chǔ),基于疲勞試驗(yàn)結(jié)果,擬合不同循環(huán)次數(shù)下界面初始剛度、殘余滑移值、粘結(jié)剪應(yīng)力與循環(huán)次數(shù)N的關(guān)系。進(jìn)而獲得不同循環(huán)次數(shù)下的界面粘結(jié)滑移本構(gòu)關(guān)系式。
[Abstract]:As a new material, CFRP has been successfully applied to civil engineering industry for its characteristics of lightweight, high strength, corrosion resistance and so on. Some achievements have been made. However, from the view of the failure mode of CFRP strengthened structure, the interface peeling between CFRP and strengthening material is a common failure form. The strengthening effect of CFRP is closely related to the bond behavior of interface. Therefore, in the study of FRP- concrete structure. The interface bond behavior between CFRP and concrete has become an important research topic. This paper is based on single shear and double shear tests of CFRP- concrete structure. The interfacial bond behavior of CFRP- concrete structure under static and fatigue conditions is studied, and the influence of key parameters is discussed. Then provide important design and theoretical basis for CFRP- concrete reinforced structure. The main research content of this paper is as follows: 1) through CFRP- concrete single shear test, the different thickness of adhesive layer is studied. The influence of concrete strength and CFRP bond length on the interfacial bond properties is also studied. At the same time, the interface failure energy is obtained by fitting. Based on T.ueda model, the CFRP stiffness and interface failure energy can be corrected. Thus, the bond-slip constitutive relation of this test is derived from three important parameters (initial interface shear stiffness, local maximum interfacial shear stress, interface failure energy) that affect the interface bond-slip. The influence of three important parameters on the bond performance of the interface is investigated by finite element analysis, while the three important parameters are kept unchanged. The influence of the shape of bond-slip curve on the interfacial bond behavior was investigated. The stiffness of CFRP was modified based on the new bond-slip bearing capacity model and the formula of interfacial failure energy obtained in this experiment. The effect of effective bond length and width correction coefficient is considered. Through the double shear fatigue test of CFRP- concrete, based on the simplified model of bilinear bond-slip. Based on the fatigue test results, the relationship between the initial stiffness, residual slip value, bond shear stress and cycle number N of the interface under different cycles is fitted, and the constitutive equation of interface bond slip under different cycles is obtained.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU377

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本文編號：1459425