本文選題：FRP　切入點：界面粘結(jié)　出處：《廣東工業(yè)大學》2015年碩士論文

【摘要】：纖維增強復合材料(F iber Reinforce Polymer,簡稱FRP)具有強度高、材質(zhì)輕及耐腐蝕的優(yōu)點,已經(jīng)被廣泛應用于各種土木工程結(jié)構(gòu)加固中。外貼FRP抗剪加固鋼筋混凝土結(jié)構(gòu)是FRP應用于結(jié)構(gòu)加固的一個重要方面。FRP的剝離破壞是FRP抗剪加固混凝土梁中常見的一種破壞模態(tài)。現(xiàn)有抗剪強度模型及規(guī)范公式中,一般直接將基于FRP與混凝土搭接接頭試驗(單剪試驗或雙剪試驗)得到的粘結(jié)強度模型用于分析FRP剝離破壞時的FRP抗剪貢獻,而抗剪加固混凝土梁中的FRP與混凝土界面的受力狀況與搭接接頭試驗中的FRP與混凝土界面的受力狀況有明顯的不同,因此直接基于搭接接頭試驗數(shù)據(jù)得到的抗剪強度模型,可能會高估FRP的抗剪貢獻,甚至導致不安全的后果。針對這一研究背景,本研究采用一種新的小梁試驗方法,通過側(cè)面粘貼FRP于預置裂縫小梁來進一步研究抗剪加固混凝土梁中FRP與混凝土界面的粘結(jié)性能,分析一系列因素對FRP與混凝土界面粘結(jié)性能的影響。本文的研究內(nèi)容主要包括以下兩部分：(1)設計了20根小梁,通過四點彎曲試驗來定量研究FRP粘結(jié)長度、條帶寬度及纖維受拉角度(FRP纖維方向與裂縫張開方向的角度)對抗剪加固中FRP與混凝土界面粘結(jié)性能的影響。試驗結(jié)果表明：(a)所有小梁的破壞模態(tài)均為FRP的剝離破壞,說明本試驗方法可以用來對FRP與混凝土的界面粘結(jié)性能進行試驗研究；(b)FRP粘結(jié)長度、條帶寬度及纖維受拉角度對FRP與混凝土的界面粘結(jié)性能有明顯的影響；(c)沿著FRP寬度方向的受力是不均勻的,相應應變分布也是不均勻的,且是非線性的,這主要是由于裂縫的不均勻開展導致了FRP在裂縫開展較大的一邊先剝離。(2)采用粒子圖像測速(Particle Image Velocimetry,簡稱PIV)技術(shù)方法,對4根小梁進一步研究了抗剪加固中FRP與混凝土的界面粘結(jié)性能。試驗結(jié)果表明：(a)PIV技術(shù)的圖像數(shù)字化可以應用于本試驗FRP與混凝土界面粘結(jié)性能研究中；(b)由輸出的界面剪應力分布可知,隨著荷載增加,界面最大剪應力從FRP長度方向中線處向兩自由端發(fā)展,且沿寬度方向,界面剪應力分布是不均勻的。
[Abstract]:Fiber reinforced composite F iber Reinforce Polymer (FRP) has the advantages of high strength, light material and corrosion resistance. Reinforced concrete structure strengthened with FRP is an important aspect of FRP used in structural strengthening. The peeling failure of FRP is common in concrete beams strengthened by FRP. A failure mode. In existing shear strength models and specifications, The bond strength model based on FRP and concrete lap joint test (single shear test or double shear test) is generally used to analyze the shear contribution of FRP in the process of FRP peeling failure. However, the stress state of FRP and concrete interface in shear strengthened concrete beam is obviously different from that of FRP and concrete interface in lap joint test, so the shear strength model is obtained directly based on the test data of lap joint test. The shear contribution of FRP may be overestimated and even unsafe. In order to further study the bond behavior between FRP and concrete interface in shear strengthened concrete beams, FRP is pasted on the side of the prefabricated cracked trabeculae. This paper analyzes the influence of a series of factors on the bond behavior between FRP and concrete interface. The main contents of this paper include the following two parts: 1) 20 trabeculas are designed, and the binding length of FRP is quantitatively studied by four-point bending test. The width of strip and the angle of tension angle between fiber direction and crack opening direction) resist the influence of bond behavior between FRP and concrete interface in shear strengthening. The experimental results show that all the failure modes of trabeculae are FRP peeling failure. The results show that this method can be used to study the bond length of FRP and concrete. The width of the strip and the tensile angle of the fiber have obvious influence on the bond behavior of the interface between FRP and concrete. The stress along the direction of the width of the FRP is not uniform, and the corresponding strain distribution is also uneven and nonlinear. This is mainly due to the uneven development of the crack, which led FRP to peel off the larger side of the crack first.) Particle Image velocimetric (PIV) technique was used to measure the velocity of the fracture. The interfacial bond behavior between FRP and concrete in shear strengthening is further studied for four trabeculas. The experimental results show that the digital image of FRP can be used in the study of interfacial bond behavior between FRP and concrete in this experiment. The interfacial shear stress distribution of. With the increase of load, the maximum shear stress of the interface develops from the midline in the direction of FRP length to the two free ends, and along the width direction, the distribution of the interfacial shear stress is uneven.
【學位授予單位】：廣東工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU377.9

【參考文獻】

相關(guān)期刊論文 前10條

1 肖建莊,李杰,魏錦濤;纖維布與混凝土之間粘結(jié)力的試驗方法研究[J];玻璃鋼/復合材料;2002年03期

2 陸新征;葉列平;滕錦光;莊江波;江見鯨;;FRP片材與混凝土粘結(jié)性能的精細有限元分析[J];工程力學;2006年05期

3 曲哲;葉列平;陳建飛;陸新征;;復雜應力狀態(tài)對混凝土梁外貼FRP條帶抗剪貢獻的影響[J];工程力學;2008年08期

4 黃培彥;張術(shù)寬;鄭順潮;周昊;鄭小紅;;FRP片材在土建修復加固工程中應用的力學問題[J];固體力學學報;2010年05期

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

6 李榮,滕錦光,岳清瑞;嵌入式CFRP板條-混凝土界面粘結(jié)性能的試驗研究[J];工業(yè)建筑;2005年08期

7 葉列平;陸新征;滕錦光;陳建飛;;FRP片材加固混凝土梁剝離承載力計算及設計[J];建筑結(jié)構(gòu);2007年12期

8 楊勇新,岳清瑞,胡云昌;碳纖維布與混凝土粘結(jié)性能的試驗研究[J];建筑結(jié)構(gòu)學報;2001年03期

9 姚諫,滕錦光;FRP復合材料與混凝土的粘結(jié)強度試驗研究[J];建筑結(jié)構(gòu)學報;2003年05期

10 王榮國,戴成琴,劉文博,趙景海;CFRP加固混凝土梁式結(jié)構(gòu)技術(shù)及其設計方法[J];纖維復合材料;2002年02期

相關(guān)博士學位論文 前1條

1 鄭小紅;濕熱環(huán)境下CFL-混凝土界面粘結(jié)—滑移機理研究[D];華南理工大學;2014年

，

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