再生混凝土梁正截面開裂彎矩分析與試驗研究
吳瑾1，丁東方2，楊曦1
- 摘 要
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（1 南京航空航天大學土木系，南京 210016； 2 連云港市交通局，連云港 222000）［摘要］在基本假定的基礎上，分析了再生混凝土梁正截面開裂彎矩理論計算模式。進行了27根再生混凝土梁和3根普通混凝土梁的正截面開裂彎矩試驗。試驗表明，相同條件下再生混凝土梁開裂彎矩比普通混凝土梁的小25%左右。根據(jù)試驗結(jié)果分析了混凝土強度和縱筋配筋率對再生混凝土梁開裂彎矩的影響，回歸出再生混凝土梁正截面抵抗矩塑性系數(shù)，從而建立了再生混凝土梁正截面開裂彎矩計算公式。應用其他研究者的試驗結(jié)果對該公式進行了驗證，結(jié)果表明，建立的再生混凝土梁正截面開裂彎矩計算公式具有較好的適用性。［關(guān)鍵詞］再生混凝土；梁；開裂彎矩；計算方法Experimental research on the cracking moment of normal section for recycled concrete beamsWu Jin1, Ding Dongfang2, Yang Xi1(1 Nanjing University of Aeronautics and Astronautics， Nangjing 210016， China; 2 Lianyungang Communication Bureau, Lianyungang 222000, China)Abstract:The model of the cracking moment of normal section for recycled concrete beams is investigated on base of some basic assumptions. The experiment of twenty-seven recycled concrete beams and three ordinary concrete beams is conducted. The experimental results show that the cracking moment of recycled concrete beams about twenty-five percentage is lower than that of ordinary concrete beams. According to the experimental results, the influence of concrete strength and reinforcement ratio on the cracking moment of recycled concrete beams is analyzed, and the plasticity coefficient of section moment of recycled concrete beams is obtained, and the calculating method of cracking moment of recycled concrete beams is established. The calculating results using this method have good aggreement with the experimental results obtained by other researchers.Keywords:recycled concrete; beams; cracking moment; calculating method國家高技術(shù)發(fā)展研究計劃(863計劃)重點項目(2009AA032301)。作者簡介：吳瑾，博士，教授，博導，Email:wujin@nuaa.edu.cn。參考文獻［1］宋新偉.再生混凝土梁受彎性能試驗研究［D］.鄭州：鄭州大學,2006.［2］林俊.再生混凝土抗壓和梁受彎性能研究［D］.南寧：廣西大學，2007.［3］肖建莊，蘭陽.再生粗骨料混凝土梁抗彎性能試驗研究［J］.特種結(jié)構(gòu)，2006，23（1）：9-12.［4］ETXEBERRIA M, MAR1′ A R, VA′ZQUEZ E. Recycled aggregate concrete as structural material［J］. Materials and Structures,2006(4):21-33.［5］黃清.再生混凝土受彎構(gòu)件正截面性能試驗研究與有限元分析［D］.哈爾濱:哈爾濱工業(yè)大學，2005.［6］肖建莊，蘭陽.再生混凝土單軸受拉性能試驗研究［J］.建筑材料學報，2006，9（2）:154-158.［7］R-HL M, ATKINSON G.The influence of recycled aggregate concrete on the stress-strain relation of concrete［J］.Darmstadt Concrete,1999(14)：12-27.［8］GB50010—2002 混凝土結(jié)構(gòu)設計規(guī)范［S］.北京:中國建筑工業(yè)出版社，2002.
