確定混凝土構(gòu)件實際應(yīng)力技術(shù)方法的研究
潘立，李志文
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(中國建筑科學(xué)研究院建筑結(jié)構(gòu)研究所， 北京 100013)［摘要］為準確推算既有混凝土結(jié)構(gòu)中受力構(gòu)件的實際應(yīng)力與內(nèi)力，系統(tǒng)地提出并詳細介紹了一種新方法——配筋鉆孔法?；谟邢拊獢?shù)值分析確定了目標函數(shù)，溝通了理論模型與實測變量之間的聯(lián)系。通過帶孔鋼筋拉伸試驗與工程實測模擬試驗，從多渠道驗證了所確定的目標函數(shù)。依據(jù)混凝土構(gòu)件軸壓試驗，對其混凝土、縱筋實際應(yīng)力和實際內(nèi)力的實測值與推算值進行了比較，獲得了比較理想的結(jié)果。該方法作為專項成套技術(shù)，可拓寬現(xiàn)有混凝土結(jié)構(gòu)檢測范圍，進一步滿足結(jié)構(gòu)安全評估、質(zhì)量鑒定、加固改造、事故分析等方面需求。補充相關(guān)試驗研究和改進現(xiàn)場測試工藝后，該方法還有望用于推算混凝土結(jié)構(gòu)中的實際預(yù)應(yīng)力效應(yīng)或局部組合應(yīng)力。［關(guān)鍵詞］配筋鉆孔法; 混凝土構(gòu)件; 實際應(yīng)力與內(nèi)力; 目標函數(shù); 理論模型; 實測變量; 鋼筋鉆孔與擴孔; 孔邊高應(yīng)力區(qū)中圖分類號：TU375.4 文獻標識碼：A 文章編號：1002-848X(2013)23-0073-08Research on the new polytechnic method of determination for actual stresses in reinforced concrete membersPan Li, Li Zhiwen（Institute of Building Structures, China Academy of Building Research, Beijing 100013, China）Abstract: To estimate accurately actual stresses and internal forces in loaded members of a reinforced concrete structure, Hole Method of Reinforcement was proposed systematically then introduced carefully. Based on the objective function gained from finite element analysis, the theoretical model was connected with the measured variable. The objective function was verified repeatedly by simulative tests of holed bars, which are tensioned separately and set in concrete members loaded in axial compression, finally it is found that the estimated and the measured is roughly same. As a set of special technologies, it can be used to broaden the existing inspection range of reinforced concrete structure, and further to meet needs of the structural safety assessment, the quality assurance, the strengthening or reconstruction, and the accident analysis. Furthermore, after adding relative tests and process improvements, the new method is also expected to estimate the actual prestressing effects or local combined stresses in the kind of extant structures.Keywords: hole method of reinforcement; reinforced concrete member; actual stresses and internal force; objective function; theoretical model; measured variable; drill hole and counterbore hole of reinforcement; high-stress distribution area near the edge of a hole作者簡介：潘立，教授級高級工程師，一級注冊結(jié)構(gòu)工程師，建研（北京）結(jié)構(gòu)工程有限公司總工程師，Email: panlicabr@163.com。參考文獻［1］潘立，李志文.確定混凝土構(gòu)件實際應(yīng)力技術(shù)方法的研究（“配筋鉆孔法”的基本原理與試驗研究）［R］.北京：中國建筑科學(xué)研究院建筑結(jié)構(gòu)研究所，2011.［2］GB/T 50344—2004 建筑結(jié)構(gòu)檢測技術(shù)標準［S］.北京：中國建筑工業(yè)出版社，2004.［3］GB 50010—2010 混凝土結(jié)構(gòu)設(shè)計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2011.
