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

【摘要】：碳纖維增強復合材料（Carbon Fiber Reinforced Plastics，簡稱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合材料。隨著我國建筑事業(yè)的快速發(fā)展，人們對建筑結構提出了更高的要求。CFRP布具有高強、輕質、減震、優(yōu)異的力電效應、壓敏性及節(jié)約建筑面積等性能，同時對混凝土構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注。國外早已將CFRP布加固技術用于工程實踐中，而我國科研和工程應用相對較少。為此，本文采用試驗研究、理論分析和ABAQUS模擬的方法，研究CFRP布加固混凝土構件的粘結性能，荷載—應變曲線以及CFRP布加固不同凍融損傷試件的抗彎、軸壓等力學性能。主要內容有： 通過CFRP布加固梁的彎剪試驗，，研究加固端的破壞類型，層間位移，荷載、粘貼長度、層數(shù)、撓度以及應變之間的關系。通過理論分析，推導出CFRP布加固試件的粘結應力公式，運用ABAQUS對試驗進行模擬，并對試驗值、理論值、模擬值進行對比。 通過多組試件的凍融循環(huán)試驗，得到凍融試件的質量損失以及動彈性模量損失率，建立了凍融損傷試件的本構關系模型。通過對凍融試件全包加固，進行抗彎試驗，得到不同凍融循環(huán)次數(shù)下全包加固試件應力－應變曲線的上升段。通過理論計算，得到試件的抗彎承載力，對試驗值、理論值進行對比分析。 通過對CFRP布加固普通混凝土柱進行軸壓試驗，研究其受力性能，加固方式，破壞形態(tài)，環(huán)向、豎向變形等；通過對全包、分包等變化參數(shù)的對比分析，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。在試驗分析基礎上，提出了CFRP布加固柱的承載力計算公式。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系曲線。 對混凝土試件分別進行50、100、150次凍融循環(huán)，試件受到不同程度的損傷，采用CFRP布對損傷試件加固后，通過對加固柱進行軸心受壓試驗，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變。試驗表明：CFRP布加固技術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行對比，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關系，得到損傷加固試件的承載力。利用ABAQUS對CFRP布加固凍融損傷柱的受力過程進行模擬，得到CFRP布加固損傷柱荷載與豎向變形的關系曲線。
[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.
【學位授予單位】：沈陽大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU37

【參考文獻】

相關期刊論文 前10條

1 馬宏旺,趙國藩;鋼筋混凝土矩形柱截面曲率延性系數(shù)概率分析[J];大連理工大學學報;2001年04期

2 何初生;王文煒;楊威;葉見曙;;預應力CFRP布加固鋼筋混凝土梁疲勞性能試驗研究[J];東南大學學報(自然科學版);2011年04期

3 李松輝,趙國藩,王松根;CFRP加固混凝土梁各受力階段的剝離機理[J];工程力學;2005年01期

4 曾憲桃;成香莉;高保彬;;內嵌碳纖維增強塑料板條抗彎加固混凝土梁試驗研究[J];工程力學;2008年12期

5 王連廣;秦國鵬;周樂;;GFRP管鋼骨高強混凝土組合柱軸心受壓試驗研究[J];工程力學;2009年09期

6 王連廣;周樂;;GFRP管鋼骨高強混凝土偏壓柱試驗研究[J];工程力學;2011年01期

7 謝建和;黃培彥;郭永昌;劉鋒;;預應力FRP加固RC梁界面疲勞裂紋擴展行為研究[J];工程力學;2011年07期

8 周愛軍;黃承逵;;CFRP布加固鋼筋混凝土梁抗彎承載力設計計算方法[J];公路交通科技;2007年08期

9 岳清瑞,陳小兵,牟宏遠;碳纖維材料(CFRP)加固修補混凝土結構新技術[J];工業(yè)建筑;1998年11期

10 岳清瑞;我國碳纖維(CFRP)加固修復技術研究應用現(xiàn)狀與展望[J];工業(yè)建筑;2000年10期

相關博士學位論文 前1條

1 魏華;CFRP加固局部強度不足混凝土柱受壓力學性能研究[D];大連理工大學;2009年

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