HRB500級鋼筋混凝土梁裂縫與變形性能試驗研究
易偉建1,楊曉1,2,李瓊3
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(1 湖南大學,長沙 410082; 2 湖南省建筑設計院,長沙 410011; 3 化工部長沙設計研究院,長沙 410116)[摘要]通過4根足尺的鋼筋混凝土簡支梁(3根采用HRB500級鋼筋、1根采用HRB335級鋼筋)受彎性能試驗,研究HRB500級鋼筋混凝土梁的受彎性能和裂縫開展規(guī)律。試驗結果表明,短期荷載下的HRB500級鋼筋混凝土梁具有良好的受彎性能;采用大直徑(32mm)HRB500級鋼筋配筋的混凝土簡支梁的最大裂縫寬度實測值小于《混凝土結構設計規(guī)范》(GB50010—2002)公式的預測值,但大于混凝土規(guī)范規(guī)定的最大裂縫寬度容許值。試驗梁的撓度、裂縫間距和最大裂縫寬度與鋼筋應力、鋼筋直徑和配筋率等因素的關系基本上可用現(xiàn)有模型預測。為滿足正常使用極限狀態(tài)的要求,建議對正常使用極限狀態(tài)的荷載代表值和規(guī)范公式的相關參數(shù)進行適當調整。[關鍵詞]HRB500級鋼筋;承載力;裂縫寬度;撓度中圖分類號:TU375.1文獻標識碼:A文章編號:1002-848X(2011)08-0110-05Experimental study on crack and flexural behavior of full scale reinforced concrete beams with HRB500 steel barsYi Weijian1, Yang Xiao1,2, Li Qiong3(1 Hunan University, Changsha 410082, China; 2 Hunan Provincial Architectural Design Institute, Changsha 410011, China; 3 Changsha Design & Research Institute of Ministry of Chemical Industry, Changsha 410116, China)Abstract:Based on flexural behavior experiment of three full scale reinforced concrete beams with HRB500 steel bars and one reinforced concrete beam with HRB335 steel bars, the flexural load-carrying capacity, crack width and deflection were studied. The experimental results indicate that the reinforced concrete beams with HRB500 steel bars have good flexural performance under short-term loading. The maximum crack width on the reinforced concrete beams with the large diameter steel bars of HRB500 grade is less than that predicted by Code for design of concrete structures(GB50010—2002), but larger than the permissible value in the code. The relationship of deflection, crack spacing and maximum crack width with the stress, diameter and ratio of steel bars can be predicted by existing model presented in the code. Considering the requirements of regular service, it is suggested that the characteristic value of load under serviceability limit state and the parameters in crack width formula in the code could be appropriately adjusted.Keywords:HRB500 steel bar; load-carrying capacity; crack width; deflection作者簡介:易偉建,博士,教授,Email:hunuyi2006@gmail.com。參考文獻[1]裴智,王友權,王學忠,等. HRB500鋼筋的研究開發(fā)與應用[J]. 建筑結構, 2003, 33(8):28-29.[2]GB50010—2002混凝土結構設計規(guī)范[S].北京:中國建筑工業(yè)出版社, 2002.[3]JTGD62—2004公路鋼筋混凝土及預應力混凝土橋涵設計規(guī)范[S]. 北京:人民交通出版社,2004.[4]JTJ267—98港口工程混凝土結構設計規(guī)范[S]. 北京:人民交通出版社,1998.[5]ACI 318-02 Buiding code requirements for structural concrete[S]. 2002.[6]Eurocode2: Design of concrete structures—Part 1-1:General rules and rules for buildings(BS EN 1992-1-1:2004)[S].Standards Policy and Strategy Committee,2004.[7]肖紅菊,韓菊紅,張雷順,等. HRB400級鋼筋混凝土梁裂縫寬度試驗[J]. 工業(yè)建筑, 2007,37(8):51-54.[8]李美云, 劉立新. HRB400級鋼筋混凝土構件裂縫寬度的試驗分析[J]. 南昌大學學報:工科版,2004,26(3): 72-75.[9]王全鳳,劉鳳誼,楊勇新,等. HRB500級鋼筋混凝土簡支梁受彎試驗[J].華僑大學學報:自然科學版, 2007,28(3):300-303.[10]丁振坤,邱洪興,胡濤,等. HRB500級鋼筋混凝土梁受彎剛度試驗[J].建筑科學與工程學報,2009,26(1):115-120.[11]王鐵成,李艷艷,戎賢. 配置500MPa鋼筋的混凝土梁受彎性能試驗[J].天津大學學報,2007,40(5):507-601.[12]張自瓊,王命平,耿樹江. 500MPa級鋼筋混凝土簡支梁變形的試驗分析[J].四川建筑科學研究,2008,34(1):1-4.[13]徐風波,沈蒲生. HRB500級鋼筋混凝土梁抗彎性能試驗研究[J].建筑結構學報,2006,27(S1):256-259,268.[14]GB50152—92混凝土結構試驗方法標準[S].北京:中國建筑工業(yè)出版社,1992.[15]CEB-FIP Model Code 1990Comité Euro-international du Béton[S].1993.