本文選題：CFRP布 + 粘結(jié)性能��； 參考：《沈陽大學(xué)》2013年碩士論文

【摘要】：碳纖維增強(qiáng)復(fù)合材料（Carbon Fiber Reinforced Plastics，簡(jiǎn)稱CFRP）是將一定長度的碳纖維編織而形成的具有多種功能的復(fù)合材料。隨著我國建筑事業(yè)的快速發(fā)展，人們對(duì)建筑結(jié)構(gòu)提出了更高的要求。CFRP布具有高強(qiáng)、輕質(zhì)、減震、優(yōu)異的力電效應(yīng)、壓敏性及節(jié)約建筑面積等性能，同時(shí)對(duì)混凝土構(gòu)件的開裂也有一定的延緩作用，因此，CFRP布引起了人們的廣泛關(guān)注。國外早已將CFRP布加固技術(shù)用于工程實(shí)踐中，而我國科研和工程應(yīng)用相對(duì)較少。為此，本文采用試驗(yàn)研究、理論分析和ABAQUS模擬的方法，研究CFRP布加固混凝土構(gòu)件的粘結(jié)性能，荷載—應(yīng)變曲線以及CFRP布加固不同凍融損傷試件的抗彎、軸壓等力學(xué)性能。主要內(nèi)容有： 通過CFRP布加固梁的彎剪試驗(yàn)，，研究加固端的破壞類型，層間位移，荷載、粘貼長度、層數(shù)、撓度以及應(yīng)變之間的關(guān)系。通過理論分析，推導(dǎo)出CFRP布加固試件的粘結(jié)應(yīng)力公式，運(yùn)用ABAQUS對(duì)試驗(yàn)進(jìn)行模擬，并對(duì)試驗(yàn)值、理論值、模擬值進(jìn)行對(duì)比。 通過多組試件的凍融循環(huán)試驗(yàn)，得到凍融試件的質(zhì)量損失以及動(dòng)彈性模量損失率，建立了凍融損傷試件的本構(gòu)關(guān)系模型。通過對(duì)凍融試件全包加固，進(jìn)行抗彎試驗(yàn)，得到不同凍融循環(huán)次數(shù)下全包加固試件應(yīng)力－應(yīng)變曲線的上升段。通過理論計(jì)算，得到試件的抗彎承載力，對(duì)試驗(yàn)值、理論值進(jìn)行對(duì)比分析。 通過對(duì)CFRP布加固普通混凝土柱進(jìn)行軸壓試驗(yàn)，研究其受力性能，加固方式，破壞形態(tài)，環(huán)向、豎向變形等；通過對(duì)全包、分包等變化參數(shù)的對(duì)比分析，分析表明：全包加固方式可明顯提高試件的承載力，有效約束加固柱的環(huán)向變形。在試驗(yàn)分析基礎(chǔ)上，提出了CFRP布加固柱的承載力計(jì)算公式。利用ABAQUS模擬加固柱的受力全過程以及開裂過程，得到荷載與豎向變形的關(guān)系曲線。 對(duì)混凝土試件分別進(jìn)行50、100、150次凍融循環(huán)，試件受到不同程度的損傷，采用CFRP布對(duì)損傷試件加固后，通過對(duì)加固柱進(jìn)行軸心受壓試驗(yàn)，研究其受力性能、破壞形態(tài)、加固方式、豎向變形、承載能力以及不同位置的應(yīng)變。試驗(yàn)表明：CFRP布加固技術(shù)能有效提高凍融損傷試件的承載力，隨著凍融循環(huán)次數(shù)的增加，加固試件的承載力提高越明顯，并與加固普通混凝土試件進(jìn)行對(duì)比，得到損傷試件加固后的特有屬性。通過修正損傷混凝土的本構(gòu)關(guān)系，得到損傷加固試件的承載力。利用ABAQUS對(duì)CFRP布加固凍融損傷柱的受力過程進(jìn)行模擬，得到CFRP布加固損傷柱荷載與豎向變形的關(guān)系曲線。
[Abstract]:Carbon Fiber Reinforced Plastics, (carbon Fiber Reinforced Plastics,) is a kind of composite material with many functions formed by braiding a certain length of carbon fiber. With the rapid development of the construction industry in our country, people put forward higher requirements for the building structure. The CFRP cloth has the properties of high strength, light weight, shock absorption, excellent electromechanical effect, pressure sensitivity and saving building area, etc. At the same time, the cracking of concrete members is also retarded, so CFRP cloth has attracted wide attention. CFRP reinforcement technology has been used in engineering practice in foreign countries, but scientific research and engineering application are relatively few in our country. Therefore, by means of experimental study, theoretical analysis and ABAQUS simulation, the bond behavior, load-strain curve of concrete members strengthened with CFRP sheets and the flexural and axial compression properties of different freeze-thaw damage specimens strengthened with CFRP sheets are studied in this paper. The main contents are: The relationship between failure type, interstory displacement, load, bonding length, floor number, deflection and strain of the strengthened beam was studied by the bending shear test of the beam strengthened with CFRP cloth. Through theoretical analysis, the formula of bond stress of CFRP reinforced specimen is deduced. The experiment is simulated by ABAQUS, and the experimental value, theoretical value and simulation value are compared. The mass loss and dynamic elastic modulus loss rate of freeze-thaw specimens were obtained by freeze-thaw cycle tests. The constitutive model of freeze-thaw damage specimens was established. Through the bending test of the freeze-thaw specimen, the rising section of the stress-strain curve of the whole cladding specimen was obtained under different freeze-thaw cycles. Through theoretical calculation, the flexural capacity of the specimen is obtained, and the experimental and theoretical values are compared and analyzed. Through the axial compression test of the ordinary concrete columns strengthened with CFRP sheets, the mechanical properties, reinforcement methods, failure patterns, circumferential and vertical deformation, and so on, are studied, and the variation parameters such as the whole package and the subcontract are compared and analyzed. The analysis shows that the load bearing capacity of the specimens can be improved obviously and the circumferential deformation of the strengthened columns can be effectively restrained. On the basis of experimental analysis, a formula for calculating the bearing capacity of CFRP reinforced columns is put forward. The relationship between load and vertical deformation is obtained by using ABAQUS to simulate the whole stress process and cracking process of strengthened columns. The concrete specimens were subjected to 50100150 freeze-thaw cycles respectively, and the specimens were damaged to varying degrees. After strengthening the damaged specimens with CFRP cloth, the axial compression tests were carried out on the strengthened columns to study their mechanical properties, failure patterns and strengthening methods. Vertical deformation, bearing capacity and strain at different locations. The test results show that the bearing capacity of freeze-thaw damage specimens can be improved effectively by using the technology of w CFRP. With the increase of freeze-thaw cycles, the bearing capacity of strengthened specimens is increased more obviously, and compared with that of ordinary concrete specimens. The special properties of the damaged specimens after strengthening are obtained. By modifying the constitutive relation of damaged concrete, the bearing capacity of the specimens strengthened with damage is obtained. Using ABAQUS to simulate the mechanical process of freeze-thaw damaged columns strengthened with CFRP sheets, the relationship curve between the load and vertical deformation of damaged columns strengthened with CFRP sheets was obtained.
【學(xué)位授予單位】：沈陽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU37

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