本文選題：FRP-混凝土界面 + 粘結(jié)-滑移　； 參考：《廣東工業(yè)大學(xué)》2017年碩士論文

【摘要】：纖維增強(qiáng)復(fù)合材料(Fiber Reinforced Polymer,簡(jiǎn)稱為FRP)在土木工程中的應(yīng)用越來越廣泛。在實(shí)際工程中,常常遇到需要使用FRP加固的混凝土結(jié)構(gòu)存在宏觀裂縫的情況。然而現(xiàn)在對(duì)宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移機(jī)理這一問題的研究還比較少,急需研究。本文作者為解決這一難題,對(duì)宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移機(jī)理進(jìn)行了初步研究。本文的主要研究?jī)?nèi)容和結(jié)論如下:(1)通過研讀國(guó)內(nèi)外眾多研究FRP在土木工程中應(yīng)用的學(xué)者的研究文獻(xiàn),研制了能有效解決加載時(shí)使FRP-混凝土界面一直處于純剪切應(yīng)力狀態(tài)這一技術(shù)難題的FRP布夾具(鋼加載頭)并對(duì)其進(jìn)行了有限元分析以驗(yàn)證其滿足試驗(yàn)要求,提出了經(jīng)過優(yōu)化的雙剪加載方案,以保證靜載下FRP-混凝土界面雙剪試驗(yàn)?zāi)茼樌M(jìn)行。(2)在有關(guān)研究的基礎(chǔ)上,經(jīng)過理論推導(dǎo)和大量試算,提出了宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移本構(gòu)模型。(3)通過FRP-混凝土界面靜載試驗(yàn),對(duì)宏觀裂縫影響下的FRP-混凝土界面承受靜載時(shí)的加載過程、破壞過程與破壞形態(tài)進(jìn)行了試驗(yàn)觀測(cè),用MATLAB軟件編寫了相關(guān)試驗(yàn)數(shù)據(jù)的運(yùn)算程序,研究了宏觀裂縫影響下的FRP-混凝土界面的應(yīng)力傳遞規(guī)律、界面粘結(jié)破壞機(jī)理、界面滑移的演化規(guī)律,并通過對(duì)試驗(yàn)數(shù)據(jù)的擬合和分析,結(jié)合MATLAB軟件建立了靜載下宏觀裂縫影響下的FRP-混凝土界面的粘結(jié)-滑移本構(gòu)模型,并與現(xiàn)有的其他研究者提出的相關(guān)模型進(jìn)行了對(duì)比。同時(shí),通過對(duì)試驗(yàn)數(shù)據(jù)的運(yùn)算與比較,對(duì)宏觀裂縫的影響區(qū)域進(jìn)行了分析。(4)依據(jù)試驗(yàn)得出的靜載下宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移本構(gòu)模型,并結(jié)合ABAQUS軟件,建立了靜載下宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移本構(gòu)關(guān)系的相關(guān)有限元模型,證明了本文提出的模型的有效性、合理性和精確性。同時(shí),通過對(duì)靜載下宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移本構(gòu)關(guān)系有限元模型進(jìn)行分析與對(duì)比,研究了宏觀裂縫對(duì)界面粘結(jié)-滑移關(guān)系的影響,彌補(bǔ)了通過試驗(yàn)的方法研究宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移關(guān)系時(shí)只能得到試件上若干個(gè)點(diǎn)的界面粘結(jié)-滑移關(guān)系而無法直觀了解加載過程中混凝土試件各處應(yīng)變變化情況的不足。(5)通過對(duì)宏觀裂縫影響下的FRP-混凝土界面粘結(jié)-滑移本構(gòu)關(guān)系的試驗(yàn)研究與有限元模型的分析,總結(jié)了相應(yīng)的規(guī)律,為在土木工程設(shè)計(jì)與施工中混凝土結(jié)構(gòu)存在宏觀裂縫前提下運(yùn)用FRP加固混凝土結(jié)構(gòu)提供了相應(yīng)的設(shè)計(jì)、施工依據(jù)與建議。
[Abstract]:Fiber Reinforced Polymer (FRP) is widely used in civil engineering. In practical engineering, there are often macroscopic cracks in concrete structures which need to be strengthened with FRP. However, there are few researches on the bond-slip mechanism of FRP- concrete interface under the influence of macroscopic cracks. In order to solve this problem, the mechanism of bond-slip at FRP- concrete interface under the influence of macroscopic cracks is studied preliminarily. The main contents and conclusions of this paper are as follows: (1) through the study of many domestic and foreign scholars who study the application of FRP in civil engineering, A FRP fixture (steel loading head), which can effectively solve the technical problem of making the interface of FRP- concrete in pure shear stress state, is developed and analyzed by finite element analysis to verify that it meets the test requirements. An optimized double shear loading scheme is put forward to ensure that the double shear test of FRP- concrete interface can be carried out smoothly under static load. The bond slip constitutive model of FRP- concrete interface under the influence of macroscopic crack is proposed. The loading process of FRP- concrete interface under static load is studied by static load test of FRP- concrete interface under the influence of macroscopic crack. The failure process and failure morphology were observed experimentally, and the calculation program of relevant test data was compiled by MATLAB software. The stress transfer law and bond failure mechanism of FRP-concrete interface under the influence of macroscopic cracks were studied. By fitting and analyzing the experimental data and combining with MATLAB software, the bond slip constitutive model of FRP- concrete interface under static load under macroscopic crack is established. The model is compared with other related models put forward by other researchers. At the same time, through the calculation and comparison of test data, the influence area of macroscopic crack is analyzed. 4) according to the experimental results, the FRP-concrete interface bond slip constitutive model under static load is obtained, and combined with ABAQUS software. The relevant finite element model of the bond slip constitutive relation of FRP- concrete interface under the influence of macroscopic crack under static load is established, and the validity, rationality and accuracy of the proposed model are proved. At the same time, through the analysis and comparison of FRP- concrete interface bond-slip constitutive relation finite element model under the influence of macroscopic crack under static load, the influence of macro crack on interface bond-slip relationship is studied. When the FRP- concrete interface bond-slip relation under the influence of macroscopic crack is studied by the experimental method, only the interface bond-slip relation of several points on the specimen can be obtained, and the concrete under loading process can not be understood intuitively. The deficiency of strain variation in various parts of the specimen. (5) through the experimental study and the finite element model analysis of the bond slip constitutive relation at the interface of FRP- concrete under the influence of macroscopic cracks, The corresponding law is summarized, which provides the corresponding design, construction basis and suggestion for strengthening concrete structure with FRP under the premise of macroscopic cracks in civil engineering design and construction.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.9

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