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(西南科技大學(xué)土木工程與建筑學(xué)院，綿陽621010)

［摘要］對在汶川地震中震損建筑物中拆下的強(qiáng)度等級約為C13的RC梁加固后進(jìn)行抗彎承載力試驗(yàn)研究，根據(jù)7組21個(gè)試件的三分點(diǎn)加載試驗(yàn)，對梁的承載力、剛度和延性等進(jìn)行綜合評估。結(jié)果表明：與直接粘貼CFRP布相比，采用剔槽植入鋼筋置換混凝土灌膠再粘貼CFRP布復(fù)合加固方案加固的梁極限承載力有顯著提高，開裂荷載及延性有較大提高；試驗(yàn)中復(fù)合加固方案的CFRP布上的最大應(yīng)力值比直接粘貼CFRP布的大2~4倍，很好地發(fā)揮了CFRP布的高強(qiáng)作用；加載中復(fù)合加固方案的CFRP布被拉斷，經(jīng)計(jì)算并結(jié)合試驗(yàn)結(jié)果，加固設(shè)計(jì)中梁的抗彎承載力提高數(shù)值滿足相關(guān)規(guī)范要求，可避免CFRP布的拉斷。

［關(guān)鍵詞］損傷RC梁；CFRP布加固；抗彎承載力；延性；破壞模式

中圖分類號(hào)：TU375.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)02-0120-04

Experiment on flexural capacity of damaged RC beams strengthened by composite CFRP sheets

Chu Yunpeng, Jia Bin, Yao Yong, Wang Ruheng

(College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China)

Abstract:The experimental study on flexural capacity of RC beams about C13, which were detached from the damaged building of Wenchuan earthquake and were strengthened, was carried out. Based on the results of three points of division loading test on 21 models which were divided into 7 groups, the bearing capacity, stiffness and ductility were comprehensively evaluated. Results show that ultimate bearing capacity of RC beam strengthened by composite CFRP sheets is much higher than that of direct pasting CFRP. Cracking load and ductility are improved higher too. The maximum stress of CFRP on which reinforcement compound solutions is 2-4 times bigger than that of direct pasting and the high-strength effect of CFRP is used very well. The CFRP of reinforcement compound solutions were ruptured under given ultimate loads, and it would be avoided if the increased value meet interrelated laws by compositing calculation and test results.

Keywords:damaged RC beam; CFRP sheets strengthening; flexural capacity; ductility; failure mode

國家“863”高新技術(shù)研究與發(fā)展計(jì)劃項(xiàng)目(2009AA032304)。

作者簡介：褚云朋，碩士，講師，Email:chuyunpeng@swust.edu.cn。

參考文獻(xiàn)

［1］YEONG-SOO SHIN，CHADON LEE. Flexural behavior of reinforced concrete beams strengthened with carbon fiber-reinforced polymer laminates at different levels of sustaining load ［J］. ACI Structural Journal，1999，96(3)：212-220.

［2］CAMPIONE G, MIRAGLIA N.Strength and strain capacities of concrete compression members reinforced with FRP［J］. Cement and Concrete Composites,2003,25(1):31-41.

［3］KHALIFA A,NANNI A. Rehabilitation of rectangular simply supported RC beams with shear deficiencies using CFRP composites［J］. Construction and Building Materials,2002，16(3)：135-146.

［4］王震宇，李洪鵬. 重復(fù)荷載作用下碳纖維約束混凝土加卸載準(zhǔn)則［J］. 建筑結(jié)構(gòu)，2009，39(7)：100-103.

［5］劉進(jìn)軍，王天穩(wěn). 碳纖維布加固框架節(jié)點(diǎn)低周反復(fù)荷載試驗(yàn)研究［J］. 建筑結(jié)構(gòu)，2010，40(2)：70-73.

［6］王蘇巖，劉貴，周英武. GFRP-高強(qiáng)混凝土界面黏結(jié)-滑移關(guān)系研究［J］. 土木工程學(xué)報(bào)，2009，42(6)：8-13.

［7］葉列平，方團(tuán)卿，岳清瑞. 碳纖維布在混凝土梁受彎加固中抗剝離性能的試驗(yàn)研究［J］. 建筑結(jié)構(gòu)，2003，33(2)：7-12.

［8］王曉剛，顧祥林，張偉平. 碳纖維布加固銹蝕鋼筋混凝土的抗彎剛度［J］.建筑結(jié)構(gòu)學(xué)報(bào)，2009，30(5)：169-176.

［9］李世宏. 碳纖維布應(yīng)力松弛試驗(yàn)研究［J］.建筑結(jié)構(gòu)，2009，39(4)：72-75.

［10］甘賢軍. CFRP加固鋼筋混凝土梁(受彎構(gòu)件)試驗(yàn)研究［D］. 重慶：重慶大學(xué)，2004.

［11］劉其卓. 碳纖維布加固不同損傷混凝土梁抗震性能的試驗(yàn)研究［D］. 武漢：武漢理工大學(xué)，2004.

［12］CECS146：2003 碳纖維片材加固修復(fù)混凝土結(jié)構(gòu)技術(shù)規(guī)程［S］. 北京：中國計(jì)劃出版社，2007.

［13］JGJ116—2009 建筑抗震加固技術(shù)規(guī)程［S］. 北京：中國建筑工業(yè)出版社，2009.

［14］趙新，源維剛. 舊房鋼筋混凝土梁的加固［J］. 建筑施工，1997，19(6)：39-40.

［15］GB50367—2006 混凝土結(jié)構(gòu)加固設(shè)計(jì)規(guī)范［S］. 北京：中國建筑工業(yè)出版社，2006.