本文關(guān)鍵詞：曲面構(gòu)件CFRP-混凝土復(fù)合界面分析方法及模型試驗(yàn)研究　出處：《長安大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 碳纖維布 加固技術(shù) 曲面構(gòu)件 極限承載力 粘結(jié)本構(gòu)模型 粘結(jié)強(qiáng)度模型

【摘要】：碳纖維材料(CFRP)加固技術(shù),以其優(yōu)良的材料性能和簡易的施工方法,被廣泛應(yīng)用于混凝土橋梁結(jié)構(gòu)的加固工程中,碳纖維材料與混凝土的界面粘結(jié)性能研究迅速成為橋梁加固領(lǐng)域的熱點(diǎn)和難點(diǎn)。通過對大量相關(guān)文獻(xiàn)的查閱發(fā)現(xiàn),已有的研究成果大多是基于等截面構(gòu)件的模型試驗(yàn),且試驗(yàn)結(jié)果離散性較大,缺乏理論依據(jù)。因此,本文以碳纖維布(CFRP)加固曲面構(gòu)件為研究對象,對26個不同曲率的混凝土曲面構(gòu)件進(jìn)行剪切試驗(yàn),研究了曲面構(gòu)件CFRP-混凝土界面的粘結(jié)破壞特征、極限承載力影響因素以及應(yīng)力(應(yīng)變)分布規(guī)律等問題。同時(shí),對3個鋼筋混凝土(RC)拱肋(RCA-1為對比拱、RCA-2和RCA-3為加固拱)進(jìn)行抗彎試驗(yàn),研究了在不同的加固方式下,結(jié)構(gòu)的破壞形態(tài)、裂縫分布規(guī)律、極限承載能力提升效果等問題。在界面粘結(jié)試驗(yàn)中,分別以混凝土強(qiáng)度等級、粘結(jié)層數(shù)、粘結(jié)長度和曲率為參數(shù),對曲面構(gòu)件的極限承載能力提升效果進(jìn)行分析發(fā)現(xiàn),CFRP粘結(jié)層數(shù)和曲率對構(gòu)件極限承載力的影響較大,而混凝土強(qiáng)度等級和粘結(jié)長度的影響則較小,曲面構(gòu)件加固效果隨著曲率的減小而增大,即結(jié)構(gòu)越平坦承載力提升越明顯。曲面構(gòu)件的界面破壞形態(tài)主要包括沿裂縫向兩側(cè)的剝離破壞、拉斷破壞和沿裂縫向單側(cè)的剝離破壞。在實(shí)際加固工程中,應(yīng)嚴(yán)格按照CFRP的粘結(jié)工藝,并采用合理的錨固措施,避免沿裂縫向單側(cè)的剝離破壞現(xiàn)象產(chǎn)生。在CFRP加固混凝土拱模型試驗(yàn)中,采用不同的加固方式,即拱頂下表面和拱肩上表面同時(shí)加固方式以及僅加固拱頂下表面的方式發(fā)現(xiàn),考慮整體效果的加固較局部加固方式,其結(jié)構(gòu)極限承載能力明顯提高。采用CFRP加固能夠有效減小拱頂下?lián)?抑制裂縫的開展和擴(kuò)張,提高結(jié)構(gòu)整體剛度。由于曲面構(gòu)件的界面粘結(jié)力是粘結(jié)剪應(yīng)力和剝離正應(yīng)力耦合作用,等截面構(gòu)件的粘結(jié)滑移本構(gòu)模型和粘結(jié)強(qiáng)度模型已不再適用。通過對已有粘結(jié)滑移本構(gòu)模型和粘結(jié)強(qiáng)度模型的對比,分別對陸新征提出的粘結(jié)滑移本構(gòu)模型和粘結(jié)強(qiáng)度模型進(jìn)行了修正,提出了考慮曲率影響的CFRP-混凝土界面粘結(jié)滑移本構(gòu)模型和粘結(jié)強(qiáng)度模型,并根據(jù)彈性力學(xué)和結(jié)構(gòu)力學(xué)相關(guān)理論,推導(dǎo)出了曲面構(gòu)件CFRP-混凝土復(fù)合界面應(yīng)力解析式。采用非線性有限元軟件Midas FEA,對CFRP加固RC拱肋進(jìn)行了全過程仿真模擬,通過對有限元結(jié)果(包括荷載-撓度曲線、鋼筋應(yīng)變、CFRP應(yīng)變)與試驗(yàn)結(jié)果進(jìn)行對比分析,驗(yàn)證了有限元模型合理性,并為以后相關(guān)的數(shù)值分析提供借鑒與指導(dǎo)。
[Abstract]:Carbon fiber (CFRP) reinforcement technology, with the construction of its excellent material properties and simple, is widely used in the reinforcement engineering of concrete bridge structure, the interface bonding performance of carbon fiber concrete material and quickly become a hot and difficult point in the field of bridge reinforcement. Through access to a large number of relevant documents, research results most of the existing model test section members based on the discrete and the test results is large, the lack of theoretical basis. Therefore, in this paper, carbon fiber cloth (CFRP) reinforced surface structure as the research object, the shear tests are performed on 26 different curvature of the concrete surface bonding component, study the surface component of CFRP- concrete interface failure characteristics and the factors affecting the ultimate bearing capacity and stress (strain) distribution problems. At the same time, the 3 reinforced concrete (RC) arch rib (RCA-1 for RCA-2 and RCA-3 than the arch, and Solid arch) bending test, were studied in different strengthening modes, the failure pattern of structure, fracture distribution, ultimate bearing capacity problem. To enhance the effect of interfacial bonding in the experiment, with the grade of concrete strength, bonding layer, bond length and curvature parameter, ultimate bearing capacity of surface lifting structure the effect analysis shows that the effect of CFRP bonding layer and curvature on the ultimate capacity of the larger, and the influence of the strength of concrete and the bond length is smaller, the surface structure of the reinforcement effect increases with the decrease of the curvature, the structure is more flat and carrying capacity is more obvious. The surface structure of the interface failure mode mainly includes damage to both sides stripping along the crack, tensile failure and crack along to unilateral debonding. Reinforcement in the actual project, should be strictly in accordance with the bonding process of CFRP, and the reasonable anchorage measures Application, avoid cracks along to unilateral debonding phenomenon. In CFRP reinforced concrete arch model test, using different strengthening modes, namely the vault and spandrel on the surface and surface and surface reinforcement reinforcement only under the arches, considering the overall effect of a local reinforcement reinforcement, improve bearing capacity the structure of the limit. The CFRP reinforcement can effectively reduce the vault deflection, restraining the crack development and expansion, improve the overall stiffness of the structure. Because the bonding force between the surface structure is the bonding shear stress and the peeling stress coupling, the bond slip constitutive model of steel structure and bond strength of the model is no longer applicable through. Comparing the existing bond slip constitutive model and bond strength of the bond slip model, respectively to Lu Xinzheng's theory of constitutive model and bond strength model, is proposed The constitutive model and the bond strength of CFRP- concrete interfacial bond slip model considering the effect of curvature, and according to the elastic mechanics and structure mechanics theory, deduced the surface structure of CFRP- concrete composite interface stress formula. Using nonlinear finite element software Midas FEA, RC of CFRP reinforced arch ribs were simulated through the whole process of simulation. The results of finite element method (including the load deflection curve, steel strain, CFRP strain) were compared with the experimental results, verify the rationality of the finite element model, and for the future of the numerical analysis and provide reference and guidance.

【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：U445.72

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