高强复合玻璃纤维加固RC梁疲劳性能研究
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摘要
现有桥梁中有一部分需要进行加固,而采用高强复合玻璃纤维进行加固在国内尚属起步阶段,研究其加固性能,尤其是加固后的疲劳性能是一项有意义的工作。本文进行了高强复合玻璃纤维加固RC梁在重复荷载作用下的弯曲性能试验研究。试验表明:粘贴高强复合玻璃纤维后混凝土梁的疲劳寿命提高了2倍多,其疲劳变形减少了61%~65%,加固梁的疲劳抗裂性能得到了较大改善。因此,粘贴复合玻璃纤维是提高混凝土梁疲劳性能的有效方法,可用于延长混凝土梁的使用寿命。本文还通过加固梁的钢筋应力幅值与疲劳寿命的关系,拟合出S-N曲线。
There are parts in the existing bridges which need to be reinforced.It is a beginning in our country using advanced glass-fiber composites to strengthen the bridge.So,it is meaningful to study the behavior of RC beams strengthened with advanced glass-fiber composites,especially the fatigue behavior.This paper presents the flexural behavior of RC beams strengthened with advanced glass-fiber composites by conducting repeating loading test on six concrete beams.It is shown that the fatigue life of concrete beams strengthened with advanced glass-fiber composites is prolonged by more than two times,the fatigue deformation is decreased by 61%～65%,and the anti-crack property is much improved,all of which have a great significance for structures in corrosive environment.The advanced glass-fiber composites is effective for the improvement of fatigue performance of concrete beams.This paper fits S-N curve by the relationship between the stress amplitude of steel bar and the fatigue life of concrete beams strengthened with advanced glass-fiber composites.
There are parts in the existing bridges which need to be reinforced.It is a beginning in our country using advanced glass-fiber composites to strengthen the bridge.So,it is meaningful to study the behavior of RC beams strengthened with advanced glass-fiber composites,especially the fatigue behavior.This paper presents the flexural behavior of RC beams strengthened with advanced glass-fiber composites by conducting repeating loading test on six concrete beams.It is shown that the fatigue life of concrete beams strengthened with advanced glass-fiber composites is prolonged by more than two times,the fatigue deformation is decreased by 61%～65%,and the anti-crack property is much improved,all of which have a great significance for structures in corrosive environment.The advanced glass-fiber composites is effective for the improvement of fatigue performance of concrete beams.This paper fits S-N curve by the relationship between the stress amplitude of steel bar and the fatigue life of concrete beams strengthened with advanced glass-fiber composites.
引文
[1]陈小兵,颜子涵,岳清瑞,等.碳纤维材料加固钢筋混凝土梁的试验研究[J].工业建筑,1998,28(11):6-10.
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[6]陈永秀,陆洲导.碳纤维布加固钢筋混凝土梁正截面的疲劳性能试验研究[J].四川建筑科学研究,2006,32(6):94-97.
[7]刘沐宇,李开兵.碳纤维布加固混凝土梁的疲劳性能试验研究[J].土木工程学报,2005,38(9):32-36.
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[9]Richard A B,Geoffrey C M.Fatigue performance of concrete beams strengthened with CFRP plates[J].Journal of Composites for Construction,1999,3(2):63-72.
[10]曾春华,邹十践.疲劳分析方法及应用[M].北京:国防工业出版社,1991.
[2]史丽远,艾军,江文明.高强复合玻璃纤维加固钢筋混凝土梁受弯性能试验研究[J].工业建筑,2002,32(1):73-74.
[3]吴刚,安琳,吕志涛.碳纤维布用于钢筋混凝土梁抗弯加固的试验研究[J].建筑结构,2000,30(7):3-7.
[4]杨建中,熊光晶,严州,等.高强玻璃纤维/碳纤维混杂复合材料加固混凝土梁的抗弯试验研究[J].土木工程学报,2004,37(7):18-22.
[5]刘宝会,王喜强,秦玉文.混凝土结构CFRP加固截面粘接质量DSSPI无损检测研究[J].地震工程与工程振动,2006,26(3):162-164.
[6]陈永秀,陆洲导.碳纤维布加固钢筋混凝土梁正截面的疲劳性能试验研究[J].四川建筑科学研究,2006,32(6):94-97.
[7]刘沐宇,李开兵.碳纤维布加固混凝土梁的疲劳性能试验研究[J].土木工程学报,2005,38(9):32-36.
[8]汝海峰,刘炎海.CFRP加固钢筋混凝土梁的正截面疲劳验算方法的试验研究[J].建筑施工,2007,29(1):36-37.
[9]Richard A B,Geoffrey C M.Fatigue performance of concrete beams strengthened with CFRP plates[J].Journal of Composites for Construction,1999,3(2):63-72.
[10]曾春华,邹十践.疲劳分析方法及应用[M].北京:国防工业出版社,1991.
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