銹蝕鋼筋再生混凝土梁試驗研究及剛度分析*
曹芙波1,2，王晨霞1,2，劉龍剛3，辛耀東4，李敬紅5,田忠剛5
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(1 南京航天航空大學， 南京 210016； 2 內(nèi)蒙古科技大學， 包頭 014010；3 上海寶冶工程技術(shù)有限公司房屋質(zhì)量檢測站，上海 200941；4 包頭市中冶置業(yè)有限責任公司， 包頭 014010； 5 中國二冶集團有限公司， 包頭 014010)［摘要］通過12根不同鋼筋銹蝕率下粗骨料取代率為100%再生混凝土梁的靜荷載試驗，分析鋼筋銹蝕率對再生混凝土梁的破壞形態(tài)、裂縫發(fā)展規(guī)律、荷載-撓度曲線、平截面假定的影響。結(jié)果表明：當鋼筋銹蝕率小于10%時，梁由于材料強度遭到破壞而發(fā)生彎曲延性破壞；當鋼筋銹蝕率大于10%時，梁由于鋼筋與再生混凝土的粘結(jié)失效而發(fā)生粘結(jié)-剪切脆性破壞；隨著鋼筋銹蝕率的增加，鋼筋與再生混凝土之間的粘結(jié)性能先增加后降低，但再生混凝土梁承載力將逐漸降低；在逐級加載過程中無論鋼筋銹蝕率大小，再生混凝土梁正截面混凝土應(yīng)變變化仍滿足平截面假定要求?；谄胀ɑ炷亮嚎箯潉偠纫?guī)范公式，引入鋼筋應(yīng)變不均勻系數(shù)的修正系數(shù)，建立了銹蝕鋼筋再生混凝土梁抗彎剛度的計算方法。［關(guān)鍵詞］再生混凝土梁; 銹蝕率; 粘結(jié)性能; 抗彎剛度中圖分類號：TU375 文獻標識碼：A 文章編號：1002-848X(2015)10-0049-07Experimental study and rigidity analysis on corroded reinforced recycled concrete beamsCao Fubo1,2， Wang Chenxia1,2， Liu Longgang3， Xin Yaodong4, Li Jinghong5， Tian Zhonggang5(1 Nanjing University of Aeronautics and Astronotics， Nanjing 210016， China； 2 Inner Mongolia University of Science and Technology， Baotou 014010， China； 3 Build Quality Inspection Station of Shanghai Baoye Engineering Technology Co., Ltd., Shanghai 200941, China; 4 Metallurgical Corporation of China Real Estate of Baotou Co., Ltd.，Baotou 014010， China; 5 China Second Metallurgy Group Co., Ltd.， Baotou 014010， China)Abstract:Static loading tests were carried out on 12 recycled aggregate concrete beams with 100% coarse aggregate replacement rate and different corrosion rate. The effects of steel bar corrosion ratio on failure modes, crack development law and load-deflection curves and plane-section assumption of recycled aggregate concrete beams were analyzed. Results show that when the steel corrosion rate is less than 10%, bending ductile failure occurs because the strength of the material is damaged. When the steel corrosion rate is greater than 10%, beam bond-shear brittle failure occurs because bond failure between steel bars and recycled concrete. With the increase of steel corrosion rate, the bond performance between steel bars and recycled concrete increases first and then decreases, but the carrying capacity of recycled aggregate concrete beam gradually decreases. The strain change of the normal section of recycled concrete beam still meets the requirements of plane-section assumption regardless of the rebar corrosion rate in step-by-step loading process. Based on the code formula of concrete beam flexural stiffness, correction factor of steel strain uniform coefficient was introduced，and calculation method of bending stiffness of corroded reinforced recycled concrete beam was established.Keywords:recycled concrete beam; corrosion rate; bond performance; bending stiffness* 內(nèi)蒙古自治區(qū)自然科學基金項目（2014MS0551），內(nèi)蒙古自治區(qū)高等學?？茖W研究項目（NJZY159），包頭市科技計劃項目（2014X1009）。通訊作者：王晨霞，博士，副教授，Email：15949488601@139.com。參考文獻［1］肖建莊.再生混凝土［M］.北京:中國建筑工業(yè)出版社，2007.［2］顏桂云,孫炳楠.銹蝕鋼筋混凝土受彎構(gòu)件抗震性能的試驗研究［J］.建筑結(jié)構(gòu),2003,33(2):16-18.［3］MANGAT P S,ELGARF M S.Flexural strength of concrete beams with corroding reinforcement［J］.ACI Structural Journal，1996,96(1):149-158.［4］牛荻濤,翟彬,王林科.銹蝕鋼筋混凝土梁的承載力分析［J］.建筑結(jié)構(gòu),1999,29(8):23-25.［5］范穎芳,周晶,黃振國.受氯化物腐蝕鋼筋混凝土構(gòu)件承載力研究［J］.工業(yè)建筑,2001,31(5):3-5.［6］牛荻濤,盧梅,王慶霖.銹蝕鋼筋混凝土梁正截面受彎承載力計算方法研究［J］.建筑結(jié)構(gòu),2002,32(10):14-17.［7］任寶雙,錢稼茹,聶建國.在用鋼筋混凝土簡支橋面梁受彎剛度估算［J］.工業(yè)建筑,2001,31(1):13-15.［8］GB/T 25177—2010混凝土用再生粗骨料［S］.北京:中國標準出版社,2010.［9］仲偉秋,貢金鑫.鋼筋電化學快速銹蝕試驗控制方法［J］．建筑技術(shù)開發(fā),2002,29(4):28-30.［10］GB/T 50152—2012 混凝土結(jié)構(gòu)試驗方法標準［S］.北京:中國標準出版社,2012.
