本文關鍵詞： 碳纖維 加固 少筋梁 適筋梁 超筋梁 有限元　出處：《武漢理工大學》2013年碩士論文　論文類型：學位論文

【摘要】：鋼筋混凝土結(jié)構(gòu)在工作期間常常會受到不同程度的損傷,造成其承載能力、剛度、穩(wěn)定性不斷下降,使得建筑物產(chǎn)生大量安全隱患。所以,對現(xiàn)有損傷鋼筋混凝土結(jié)構(gòu)進行補強加固已經(jīng)成為建筑行業(yè)的一個新熱點。碳纖維材料作為一種新型材料,由于其具有自重輕、耐久性好、抗拉強度高、施工方便快捷等優(yōu)點,被廣泛應用在工業(yè)和民用建筑加固中。近年來,我國對碳纖維布加固舊有建筑損傷房屋進行了大量的試驗研究,加固的技術(shù)水平和施工工藝取得了突破性發(fā)展。在鋼筋混凝土結(jié)構(gòu)中梁作為建筑結(jié)構(gòu)的重要構(gòu)件,有著舉足輕重的作用,但梁在使用過程中會由于各種原因受到不同程度的損傷和破壞。但目前對超過承載能力的梁加固研究還很少。 本試驗探索研究了碳纖維布片材加固達到承載力水平的鋼筋混凝土梁的抗彎性能。一共選取了12根矩形梁進行分析研究：少筋梁、適筋梁、超筋梁各4根,其中,9根鋼筋混凝土梁為預先加載到構(gòu)件破壞再用碳纖維布加固,3根梁采用未受損直接加固的方法。通過對少筋梁、適筋梁和超筋梁碳纖維布加固研究,考察損傷程度、配筋率、粘貼不同層數(shù)的碳纖維布和不同寬度的環(huán)箍對加固效果的影響。 通過對試驗的數(shù)據(jù)分析、理論分析和有限元計算分析,最終試驗結(jié)果表明：1、無論是少筋梁、適筋梁還是超級梁,在構(gòu)件超過極限承載能力后用碳纖維布加固都能使梁恢復到原有的極限承載能力；2、破損加固時粘貼一層與兩層碳纖維布對梁極限承載能力和變形能力有所改善,但改善效果隨著配筋率的提高而降低；3、環(huán)箍寬度對加固效果基本沒有影響；4、粘貼碳纖維布加固破損梁對于梁彈性階段的剛度、開裂荷載和裂縫限制效果不明顯,但碳纖維布在加載后期可以有效抑制裂縫發(fā)展,提高梁的抗彎剛度；5、采用有限元程序ANSYS對碳纖維布加固鋼筋混凝土梁和未加固梁進行了非線性有限元數(shù)值模擬計算,計算得極限承載能力與試驗結(jié)果基本吻合。 最后,總結(jié)了本文所做的研究成果并提出了進一步的工作展望。本文的研究成果對碳纖維布加固破損梁的合理設計具有一定的指導意義和參考價值。
[Abstract]:Reinforced concrete structures are often damaged in varying degrees during the work, resulting in its bearing capacity, stiffness, stability decline, making the building a large number of safety risks. Reinforcement of existing damaged reinforced concrete structures has become a new hot spot in the construction industry. As a new material, carbon fiber material has light weight, good durability and high tensile strength. In recent years, a large number of experiments have been carried out in China to strengthen damaged buildings with carbon fiber sheets. The technical level and construction technology of reinforcement have made a breakthrough development, in the reinforced concrete structure, beam as an important component of the building structure, plays a pivotal role. However, in the process of use, beams will be damaged and destroyed to varying degrees due to various reasons, but at present, there are few researches on the reinforcement of beams that exceed the bearing capacity. In this experiment, the flexural behavior of reinforced concrete beams strengthened with CFRP sheets was studied. Twelve rectangular beams were selected for analysis: four beams with less reinforcement, four beams with appropriate reinforcement and four beams with extra reinforcement. Among them, 9 reinforced concrete beams are pre-loaded and then strengthened with CFRP sheets. The method of direct strengthening without damage is adopted in 3 beams. The study of CFRP reinforcement with less reinforcement beams, suitably reinforced beams and superreinforced beams is carried out. The effects of damage degree, reinforcement ratio, carbon fiber sheets with different layers and hoops of different widths on the reinforcement effect were investigated. Through the data analysis, theoretical analysis and finite element analysis of the test, the final test results show that: 1, no matter it is a small reinforcement beam, a suitable reinforced beam or a super beam. After the ultimate bearing capacity of the member is exceeded, the beam can be restored to the original limit bearing capacity when strengthened with carbon fiber sheet. (2) the ultimate bearing capacity and deformation capacity of the beam are improved by sticking one layer and two layers of carbon fiber cloth, but the improvement effect decreases with the increase of reinforcement ratio. 3, the width of hoop has no effect on the reinforcement effect; 4. The stiffness, crack load and crack limitation of the damaged beams strengthened with CFRP sheets are not obvious in the elastic stage, but the CFRP sheets can effectively restrain the crack development and improve the flexural stiffness of the beams at the later loading stage. 5. The nonlinear finite element numerical simulation of reinforced concrete beams and unstrengthened beams strengthened with CFRP sheets is carried out by using the finite element program ANSYS, and the ultimate bearing capacity is in good agreement with the experimental results. Finally, the research results of this paper are summarized and the prospect of further work is put forward. The research results of this paper have certain guiding significance and reference value for the reasonable design of CFRP strengthened damaged beams.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU375.1

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