本文選題：玄武巖纖維布 + 損傷混凝土梁�。� 參考：《哈爾濱工業(yè)大學(xué)》2014年博士論文

【摘要】：近年來(lái)隨著社會(huì)經(jīng)濟(jì)的發(fā)展，，公路的交通負(fù)荷越來(lái)越重，現(xiàn)有橋梁頻繁出現(xiàn)病害和損傷，承載力降低，使用性能下降。我國(guó)目前的橋梁工程建設(shè)已經(jīng)從過(guò)去的大面積新建工程轉(zhuǎn)為新建與已建橋梁補(bǔ)強(qiáng)加固相結(jié)合的階段。據(jù)資料顯示，加固工程相對(duì)新建工程而言，可節(jié)約大概40%左右的投資成本，縮短約50%時(shí)間成本，具有明顯的經(jīng)濟(jì)優(yōu)勢(shì)。既有結(jié)構(gòu)的承載力減弱，主要體現(xiàn)在抗彎和抗剪兩個(gè)方面，且大部分的損傷體現(xiàn)在撓度、裂縫和表面破損等指標(biāo)。近年來(lái)新興的玄武巖纖維布不僅抗拉強(qiáng)度與彈性模量較高，而且其粘結(jié)性、耐熱性和抗腐蝕性等物理性能優(yōu)越，在土木結(jié)構(gòu)和構(gòu)件中得到廣泛使用，尤其在鋼筋混凝土結(jié)構(gòu)加固補(bǔ)強(qiáng)方面的應(yīng)用越來(lái)越受到青睞。 本文在玄武巖纖維布加固損傷鋼筋混凝土梁的試驗(yàn)基礎(chǔ)上，研究梁的抗彎、抗剪性能及撓度裂縫計(jì)算方法，以期為玄武巖纖維布加固損傷鋼筋混凝土梁的設(shè)計(jì)、施工提供理論依據(jù)。論文中先對(duì)玄武巖纖維布加固損傷混凝土梁抗彎性能開(kāi)展研究，通過(guò)外貼玄武巖纖維布加固損傷鋼筋混凝土梁的試驗(yàn)，研究不同配筋率、加固量、初始荷載及加載歷史情況下梁的屈服荷載、破壞荷載及鋼筋、混凝土和玄武巖纖維布的應(yīng)力應(yīng)變變化規(guī)律，研究給出不同破壞模型下玄武巖纖維布加固混凝土梁的抗彎承載力計(jì)算公式。又對(duì)玄武巖纖維布加固損傷混凝土梁的抗剪性能開(kāi)展研究，研究不同剪跨比、加固量、初始荷載等情況下梁的抗剪承載力變化規(guī)律。修正了玄武巖纖維布加固損傷混凝土梁的抗剪承載力計(jì)算公式。 同時(shí)文中還對(duì)玄武巖纖維布加固梁的撓度和裂縫計(jì)算開(kāi)展研究。分析玄武巖纖維布加固損傷鋼筋混凝土梁的撓度及裂縫變化規(guī)律，修正了玄武巖纖維布加固梁的撓度和裂縫間距及裂縫寬度計(jì)算方法。 結(jié)合工程實(shí)際，通過(guò)對(duì)哈伊公路橋梁采用玄武巖纖維布加固研究，驗(yàn)證了本文提出的玄武巖纖維布加固損傷混凝土梁抗彎、抗剪承載力計(jì)算公式的有效性，可為實(shí)際加固工程提供參考。
[Abstract]:In recent years, with the development of social economy, the traffic load of the highway becomes more and more heavy, the existing bridges frequently appear diseases and injuries, the bearing capacity is reduced, and the performance of the existing bridges is decreased. At present, the bridge construction in our country has changed from a large area of newly built projects to a stage of combining the new construction with the reinforcement of the existing bridges. According to the data, the reinforcement project can save about 40% of the investment cost and shorten about 50% of the time cost compared with the new project, which has obvious economic advantages. The bearing capacity of the existing structure is weakened, mainly in the aspects of bending and shear resistance, and most of the damage is reflected in the indexes of deflection, crack and surface damage. In recent years, new basalt fiber cloth not only has high tensile strength and elastic modulus, but also has excellent physical properties, such as adhesion, heat resistance and corrosion resistance, so it is widely used in civil structures and components. Especially the application of reinforced concrete structure reinforcement is more and more popular. On the basis of the experiment of strengthening damaged reinforced concrete beams with basalt fiber sheets, this paper studies the calculation methods of bending, shear properties and deflection cracks of the beams, in order to design the reinforced concrete beams strengthened with basalt fiber sheets. Construction provides theoretical basis. In this paper, the flexural behavior of damaged concrete beams strengthened with basalt fiber sheets is studied firstly, and the different reinforcement ratio and reinforcement amount are studied through the experiment of strengthening damaged reinforced concrete beams with outer basalt fiber sheets. Under the initial load and loading history, the yield load, the failure load and the stress-strain variation of steel bar, concrete and basalt fiber cloth, The formulas for calculating the flexural capacity of concrete beams strengthened with basalt fiber sheets under different failure models are presented. The shear resistance of damaged concrete beams strengthened with basalt fiber sheets is studied, and the shear bearing capacity of beams under different shear span ratio, reinforcement amount and initial load is studied. The formula for calculating the shear capacity of damaged concrete beams strengthened with basalt fiber sheets is modified. At the same time, the deflection and crack calculation of the beams strengthened by basalt fiber cloth are also studied. The deflection and crack variation of reinforced concrete beams strengthened with basalt fiber sheets are analyzed, and the calculation method of deflection, crack spacing and crack width of beams strengthened by basalt fiber sheets is modified. Combined with the engineering practice, the basalt fiber cloth is used to reinforce the Hay highway bridge, which verifies the validity of the calculation formula of the flexural and shear bearing capacity of the damaged concrete beam strengthened by the basalt fiber cloth in this paper. It can provide reference for practical reinforcement engineering.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375.1

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