環(huán)境損傷作用下CFRP布加固混凝土梁力學(xué)性能研究
[Abstract]:Due to the influence of various environmental factors, engineering construction quality problems and service time, the performance of buildings is gradually declining. The reinforcement and restoration of damaged buildings can not only ensure that the damaged buildings can adapt to the development of human society, but also save the construction cost. However, most of the existing reinforcement methods of concrete structures have some defects. Carbon fiber reinforced composite (CFRP) has been widely used in building maintenance and renovation because of its high strength, corrosion resistance, fatigue resistance and many other excellent properties. Therefore, the mechanical properties of concrete beams strengthened with CFRP sheets under environmental damage are studied in this paper. The main contents are as follows: the experimental study on mechanical properties of concrete beams strengthened with CFRP sheets under environmental damage is carried out. The effects of reinforcement ratio and CFRP reinforcement amount and environmental damage on the failure form, bearing capacity, deformation capacity and crack development of the specimens are analyzed. The results show that there are two kinds of failure modes: 1 / CFRP brac fracture. Central crack development caused by the CFRP layout of the peeling damage. With the increase of reinforcement ratio, the bearing capacity of the specimen increases gradually, the increase of bearing capacity decreases, the velocity of stiffness degradation and the growth rate of sectional curvature decrease, the deflection of span, the width of crack and the average crack spacing decrease. With the increase of CFRP reinforcement, the bearing capacity and bearing capacity of the specimens increase gradually, the stiffness degradation speed and section curvature growth speed decrease, the mid-span deflection, crack width and average crack spacing decrease. With the increase of environmental damage, the bearing capacity and bearing capacity of the specimen decrease gradually, the stiffness degradation speed and section curvature increase, the deflection of span, the width of crack and the average crack spacing increase. The results of strain analysis show that the cross section strain distribution measured along the beam height accords with the assumption of plane section. At the beginning of loading, the strain growth trend of CFRP cloth is basically consistent with that of longitudinal steel bar, and the strain growth rate of CFRP cloth is gradually larger than that of longitudinal reinforcement strain growth rate after the specimen yield, and the CFRP cloth gradually bears the main tensile stress. With the increase of reinforcement ratio and CFRP reinforcement amount, the strain growth rate of longitudinal reinforcement and CFRP cloth slowed down, and the strain growth rate of longitudinal reinforcement and CFRP cloth increased with the increase of environmental damage. From the initial loading stage of the specimen to the failure of the specimen, the strain of the U-type CFRP cloth Anchorage hoop increases steadily and the strain of the U-type Anchorage hoop can effectively restrain the peeling between the CFRP cloth and the concrete. On the basis of experimental study, according to the strain relation of section and static equilibrium condition, considering the influence of reinforcement ratio and environment damage, the strength reduction coefficient and environmental damage coefficient of CFRP cloth are introduced. The formula of crack, yield and ultimate bearing capacity of concrete beams strengthened with CFRP sheets under environmental damage is derived, and the design method of flexural bearing capacity of normal section is given. According to the calculation model of bond slip crack of ordinary concrete beam, considering the reinforcement ratio and the influence of environment damage, the influence coefficient of CFRP sheet reinforcement and environment damage is introduced. The formula for calculating the cracks of concrete beams strengthened with CFRP sheets under the action of environmental damage is derived. According to curvature method, considering the influence of CFRP layer number and environmental damage, the influence coefficient of CFRP layer number and environmental damage coefficient is introduced, and the deflection calculation formula of concrete beam strengthened by CFRP cloth under environmental damage is deduced. The method of checking the deformation of concrete beams strengthened with CFRP sheets and the calculation formula of the width of U-type Anchorage hoop of CFRP cloth are given.
【學(xué)位授予單位】:安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TU37
【相似文獻(xiàn)】
相關(guān)期刊論文 前10條
1 張娟秀;葉見曙;姚偉發(fā);;粘貼加固混凝土梁疲勞性能研究[J];建筑結(jié)構(gòu);2010年S2期
2 張淑峰;張明峰;藺海曉;;混合裂紋對(duì)鋼板加固混凝土梁安全性的影響[J];山西建筑;2012年24期
3 歐陽(yáng)煜,錢在茲;粘貼片材加固混凝土梁的粘結(jié)剪應(yīng)力分析[J];工程力學(xué);2000年06期
4 楊曉丹,張長(zhǎng)文,張素梅;外粘鋼板加固混凝土梁的性能分析[J];低溫建筑技術(shù);2001年02期
5 翟愛良,劉夫江,馮耀奇,劉普倫;粘貼鋼板加固混凝土梁的正截面承載力計(jì)算[J];山東農(nóng)業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2002年03期
6 王天穩(wěn);彈性支點(diǎn)加固混凝土梁最佳支點(diǎn)剛度的計(jì)算[J];建筑技術(shù)開發(fā);2002年03期
7 王天穩(wěn),孫乃波;支點(diǎn)剛度對(duì)被加固混凝土梁受力性能的影響[J];工業(yè)建筑;2002年11期
8 吳志平,楊林德;外貼碳纖維增強(qiáng)材料加固混凝土梁的抗彎設(shè)計(jì)[J];地下空間與工程學(xué)報(bào);2005年02期
9 趙毓成;張文獻(xiàn);王英杰;;粘貼預(yù)應(yīng)力鋼板加固混凝土梁技術(shù)的理論研究[J];工業(yè)建筑;2006年S1期
10 吳輝琴;謝肖禮;王波;臧華;;加固混凝土梁的有限元分析及優(yōu)化設(shè)計(jì)[J];廣西工學(xué)院學(xué)報(bào);2006年03期
相關(guān)會(huì)議論文 前10條
1 丁亞紅;郝永超;郝凌博;;內(nèi)嵌螺旋肋鋼絲加固混凝土梁彎曲性能研究[A];第十八屆玻璃鋼/復(fù)合材料學(xué)術(shù)年會(huì)論文集[C];2010年
2 張娟秀;葉見曙;姚偉發(fā);;粘貼加固混凝土梁疲勞性能研究[A];第二屆全國(guó)工程結(jié)構(gòu)抗震加固改造技術(shù)交流會(huì)論文集[C];2010年
3 盧召紅;張?jiān)品?李巖;;體外預(yù)應(yīng)力加固混凝土梁裂縫性能試驗(yàn)研究[A];慶祝劉錫良教授八十華誕暨第八屆全國(guó)現(xiàn)代結(jié)構(gòu)工程學(xué)術(shù)研討會(huì)論文集[C];2008年
4 王海良;樊鵬飛;楊新磊;;纖維布加固混凝土梁抗彎疲勞性能研究現(xiàn)狀及展望[A];建筑結(jié)構(gòu)高峰論壇——復(fù)雜建筑結(jié)構(gòu)彈塑性分析技術(shù)研討會(huì)論文集[C];2012年
5 高亮;金華;宋東輝;康洪濤;張黎;;小議碳纖維加固混凝土梁的試驗(yàn)研究[A];第17屆全國(guó)結(jié)構(gòu)工程學(xué)術(shù)會(huì)議論文集(第Ⅲ冊(cè))[C];2008年
6 張強(qiáng)志;高亮;張黎;;碳纖維加固混凝土梁的試驗(yàn)研究[A];土木工程建造管理:2008年遼寧省土木建筑學(xué)會(huì)建筑施工專業(yè)委員會(huì)論文集[C];2008年
7 李源;張保印;劉勻;張興虎;王石生;;碳素纖維布加固混凝土梁的疲勞試驗(yàn)研究[A];第二屆全國(guó)土木工程用纖維增強(qiáng)復(fù)合材料(FRP)應(yīng)用技術(shù)學(xué)術(shù)交流會(huì)論文集[C];2002年
8 崔士起;成勃;崔全岳;;表面嵌固法加固混凝土梁抗彎性能試驗(yàn)研究[A];山東土木建筑學(xué)會(huì)建筑結(jié)構(gòu)專業(yè)委員會(huì)2008年學(xué)術(shù)年會(huì)論文集[C];2008年
9 張龍生;李唐寧;陳小英;卓靜;;縱向和橫向預(yù)應(yīng)力CFRP加固混凝土梁對(duì)比分析[A];工業(yè)建筑(2009·增刊)——第六屆全國(guó)FRP學(xué)術(shù)交流會(huì)論文集[C];2009年
10 李方剛;左光輝;;HFRP加固混凝土梁的抗彎承載力計(jì)算方法的研究[A];土木建筑學(xué)術(shù)文庫(kù)(第16卷)[C];2012年
相關(guān)博士學(xué)位論文 前5條
1 鮑安紅;粘貼加固混凝土梁的剝離研究[D];重慶大學(xué);2005年
2 陳永秀;碳纖維加固混凝土梁試驗(yàn)與理論研究[D];同濟(jì)大學(xué);2007年
3 NGUYEN PHAN ANH;淺表嵌入式FRP加固混凝土梁溫度與持續(xù)荷載的界面效應(yīng)研究[D];武漢理工大學(xué);2012年
4 張(王樂(lè))元;體外CFRP筋加固混凝土梁受彎性能的研究[D];東北林業(yè)大學(xué);2010年
5 王興國(guó);預(yù)應(yīng)力纖維片材加固混凝土梁抗彎性能研究[D];中南大學(xué);2007年
相關(guān)碩士學(xué)位論文 前10條
1 孫偉賀;FRP加固混凝土梁抗彎性能有限元分析[D];東北大學(xué);2013年
2 姚雪群;多支點(diǎn)無(wú)粘結(jié)預(yù)應(yīng)力CFRP板加固混凝土梁抗彎性能研究[D];濟(jì)南大學(xué);2015年
3 周浩;環(huán)境損傷作用下CFRP布加固混凝土梁力學(xué)性能研究[D];安徽工業(yè)大學(xué);2015年
4 秘鳳雪;FRP加固混凝土梁剛度及變形非線性有限元分析[D];濟(jì)南大學(xué);2016年
5 董斌;考慮次軸力影響的體外預(yù)應(yīng)力加固混凝土梁的試驗(yàn)研究[D];天津大學(xué);2009年
6 魯恒;混錨鋼板加固混凝土梁受力性能分析[D];中南大學(xué);2014年
7 高戈;碳纖維加固混凝土梁、板結(jié)構(gòu)研究[D];浙江大學(xué);2003年
8 王超峰;混錨薄板加固混凝土梁受力分析[D];中南大學(xué);2013年
9 馬艷潔;內(nèi)嵌預(yù)應(yīng)力螺旋肋鋼絲加固混凝土梁抗彎性能研究[D];河南理工大學(xué);2012年
10 劉麗娜;內(nèi)嵌預(yù)應(yīng)力螺旋肋鋼絲加固混凝土梁抗彎試驗(yàn)及理論研究[D];河南理工大學(xué);2009年
,本文編號(hào):2150533
本文鏈接:http://sikaile.net/jingjilunwen/jianzhujingjilunwen/2150533.html