锈蚀钢筋混凝土梁抗弯承载力计算方法
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摘要
目前,多数锈蚀钢筋混凝土梁抗弯承载力计算方法均建立在试验基础上,部分理论计算方法尚未考虑锈蚀钢筋本构关系。为提出一种实用的理论计算方法,拟基于经典层合板理论推导锈蚀钢筋混凝土梁抗弯承载力计算公式,得到锈蚀钢筋混凝土梁的荷载—挠度关系。经试验验证,在屈服荷载附近,理论值与试验结果吻合较好,平均误差为6.6%;构件进入屈服阶段前,采用理论方法所求跨中挠度值大于相同荷载条件下的试验结果,理论计算值相对可靠,对构件失效具有预警作用。
Now,flexural capacity of corroded reinforced concrete beams is mostly obtained based on experiments,without considering constitutive law of corroded steel. In order to put forward a practical calculation method for the flexural capacity,a formula based on classical laminate theory is derived,and a load-deformation relation of corroded reinforced concrete beams is obtained. Taking consideration of both corrosion degree and reinforcement index,near the yield load,the theoretical results agree well with the experimental results,and the average error is 6. 6%. Before corroded reinforced concrete beams enter yield stage,the theoretical middle span deflections are larger than the experimental results under the same loading. And the results of theoretical calculation are relatively conservative; they can be used to predict failure of corroded reinforced concrete beams.
Now,flexural capacity of corroded reinforced concrete beams is mostly obtained based on experiments,without considering constitutive law of corroded steel. In order to put forward a practical calculation method for the flexural capacity,a formula based on classical laminate theory is derived,and a load-deformation relation of corroded reinforced concrete beams is obtained. Taking consideration of both corrosion degree and reinforcement index,near the yield load,the theoretical results agree well with the experimental results,and the average error is 6. 6%. Before corroded reinforced concrete beams enter yield stage,the theoretical middle span deflections are larger than the experimental results under the same loading. And the results of theoretical calculation are relatively conservative; they can be used to predict failure of corroded reinforced concrete beams.
引文
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[2]AL-SULAIMANI G J,KALEEMULLAH M,BASUNBUL I A,et al.Influence of corrosion and cracking on bond behavior and strength of reinforced concrete members[J].ACI Structural Journal,1990,87(2):220-231.
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[4]金伟良,赵羽习.锈蚀钢筋混凝土梁抗弯强度的试验研究[J].工业建筑,2001,31(5):9-12.
[5]徐善华,曾柯,牛荻涛.锈蚀钢筋混凝土受弯构件正截面承载力计算模型[J].建筑结构,2006,36(10):79-82.
[6]WANG X H,LIU X L.Modeling bond strength of corroded reinforcement without stirrups[J].Cement and Concrete Research,2004,34(8):1333-1338.
[7]晏育松,雷斌.锈蚀钢筋混凝土梁抗弯承载力理论分析[J].混凝土,2011(4):38-40.
[8]CORONELLI D,GAMBAROVA P.Structural assessment of corroded reinforced concrete beam[J].Journal of Structural Engineering,2004,130(8):1215-1222.
[9]张猛,李瑶亮,赵桂峰,等.锈蚀钢筋混凝土梁承载力退化特性数值分析[J].混凝土,2016(3):34-37.
[10]李春良.预应力CFRP加固钢筋砼梁复合结构力学行为分析[D].吉林:吉林大学,2008.
[11]吕恩林.复合材料力学[M].重庆:重庆大学出版社,1992.
[12]张伟平,顾祥林,金贤玉.混凝土中钢筋锈蚀机理及锈蚀钢筋力学性能研究[J].建筑结构学报,2010,29(增1):327-330.
[13]袁迎曙,贾福萍,蔡悦.锈蚀钢筋的力学性能退化研究[J].工业建筑,2000,30(1):43-46.
[14]虞爱萍,赵艳林.锈蚀钢筋混凝土梁疲劳刚度分析[J].广西大学学报(自然科学版),2013,38(6):1278-1279.
[15]彭建新,胡守旺,宋波.锈蚀RC梁抗弯性能试验与数值分析[J].中国公路学报,2015,28(6):37-42.
[2]AL-SULAIMANI G J,KALEEMULLAH M,BASUNBUL I A,et al.Influence of corrosion and cracking on bond behavior and strength of reinforced concrete members[J].ACI Structural Journal,1990,87(2):220-231.
[3]MALUMBELA G,ALEXANDER M,MOYO P.Variation of steel loss and its effect on the ultimate flexural capacity of RC beams corroded and repaired under load[J].Construction and Building Materials,2011,24(6):1051-1059.
[4]金伟良,赵羽习.锈蚀钢筋混凝土梁抗弯强度的试验研究[J].工业建筑,2001,31(5):9-12.
[5]徐善华,曾柯,牛荻涛.锈蚀钢筋混凝土受弯构件正截面承载力计算模型[J].建筑结构,2006,36(10):79-82.
[6]WANG X H,LIU X L.Modeling bond strength of corroded reinforcement without stirrups[J].Cement and Concrete Research,2004,34(8):1333-1338.
[7]晏育松,雷斌.锈蚀钢筋混凝土梁抗弯承载力理论分析[J].混凝土,2011(4):38-40.
[8]CORONELLI D,GAMBAROVA P.Structural assessment of corroded reinforced concrete beam[J].Journal of Structural Engineering,2004,130(8):1215-1222.
[9]张猛,李瑶亮,赵桂峰,等.锈蚀钢筋混凝土梁承载力退化特性数值分析[J].混凝土,2016(3):34-37.
[10]李春良.预应力CFRP加固钢筋砼梁复合结构力学行为分析[D].吉林:吉林大学,2008.
[11]吕恩林.复合材料力学[M].重庆:重庆大学出版社,1992.
[12]张伟平,顾祥林,金贤玉.混凝土中钢筋锈蚀机理及锈蚀钢筋力学性能研究[J].建筑结构学报,2010,29(增1):327-330.
[13]袁迎曙,贾福萍,蔡悦.锈蚀钢筋的力学性能退化研究[J].工业建筑,2000,30(1):43-46.
[14]虞爱萍,赵艳林.锈蚀钢筋混凝土梁疲劳刚度分析[J].广西大学学报(自然科学版),2013,38(6):1278-1279.
[15]彭建新,胡守旺,宋波.锈蚀RC梁抗弯性能试验与数值分析[J].中国公路学报,2015,28(6):37-42.