玄武岩纤维布加固损伤RC梁弯曲疲劳试验研究

玻璃钢/复合材料 ›› 2016, Vol. 0 ›› Issue (6): 25-32.

玄武岩纤维布加固损伤RC梁弯曲疲劳试验研究

王海良^1,2,郭富¹

1.天津城建大学土木工程学院,天津300384;
2.天津市土木建筑结构防护与加固重点实验室,天津300384

收稿日期:2016-01-13 出版日期:2016-06-28 发布日期:2016-06-28
作者简介:王海良(1966-),男,硕士,教授,主要从事既有桥梁结构检测、评价及加固研究,Wanghailiang6601@126.com。
基金资助:
天津市自然基金重点项目(12JCZDJC28900);天津市科技兴海项目(KJXH2012-19)

EXPERIMENTAL STUDY ON FLEXURAL FATIGUE PERFORMANCE OF DAMAGEDREINFORCED CONCRETE BEAMS STRENGTHENED WITH BFRP SHEETS

WANG Hai-liang^1,2, GUO Fu¹

1.School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;
2.Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin 300384, China

Received:2016-01-13 Online:2016-06-28 Published:2016-06-28

摘要/Abstract

摘要： 结合大量混凝土桥梁存在病害需要加固、桥梁主要承受疲劳荷载的实际情况,研究等幅、变幅疲劳荷载下,粘贴不同层数玄武岩纤维布加固预损伤混凝土梁疲劳寿命、刚度退化速率等。结果表明,①等幅、变幅疲劳荷载作用下,粘贴2层、3层玄武岩纤维布较粘贴1层试验梁疲劳寿命均分别提高20%、40%左右;粘贴相同层数玄武岩纤维布时,变幅疲荷载劳作用较等幅疲劳荷载作用试验梁疲劳寿命降低16%左右。②变幅疲劳可显著加快试验梁钢筋应变、跨中挠度发展,其跨中挠度和疲劳次数关系曲线表现为明显“凹”型。③未粘贴纤维布等幅疲劳时试验梁刚度衰减速率为0.313MN·m²/万次,粘贴1层、2层、3层纤维布等幅疲劳时试验梁刚度衰减速率为0.014MN·m²/万次左右,粘贴1层、2层、3层纤维布变幅疲劳时试验梁刚度衰减速率为0.050MN·m²/万次左右,可见粘贴玄武岩纤维布可降低试验梁疲劳刚度衰减速率,变幅疲劳显著增大试验梁疲劳刚度衰减速率。

关键词: 玄武岩纤维布, 损伤钢筋混凝土梁, 弯曲疲劳, 等幅、变幅, 疲劳刚度衰减速率

Abstract: According to the combined analysis with the actual situation that a large number of deleterious concrete bridges which require strengthening, and the bridge mainly suffer fatigue loading, the fatigue life and stiffness degradation rate of basalt fiber reinforced concrete beams strengthened with different layers of basalt fiber are studiedunder constant and variable amplitudes fatigue loading. Research results demonstrates that: (1)Under constant and variable amplitudes fatigue loading, compared with RC beams strengthened with one layer of BFRP sheets, fatigue lives of RC beams strengthened with two and three layers of BFRP sheets are increased by 20% and 40%, separately. With the same BFRP sheets reinforcement layers, fatigue lives of the strengthened RC beams under variable amplitude fatigue loading are reduced by 16% than those under constant fatigue loading. (2) Variable amplitude fatigue loading can fasten steel bar strains and middle span deflections of beams. The curve of the middle span deflection and fatigue times is obviously "concave" shape. (3) The stiffness degradation rate of beams without BFRP sheets under constant fatigue loading is about 0.313 MN·m²/Million times, while the stiffness degradation rate of beams strengthened with one, two, three layers of BFRP sheets under constant fatigue loading is about 0.014 MN·m²/Million times, and the rate under variable amplitude fatigue loading is about 0.050 MN·m²/Million times. It demonstrates that pasting BFRP sheets reduces stiffness degradation rate of the beams, and variable fatigue loading significantly increased stiffness degradation rate of beams.

Key words: BFRP sheets, damaged RC beams, flexural fatigue, constant and variable amplitude, stiffness degradation rate

中图分类号:

王海良,郭富. 玄武岩纤维布加固损伤RC梁弯曲疲劳试验研究[J]. 玻璃钢/复合材料, 2016, 0(6): 25-32.

WANG Hai-liang, GUO Fu. EXPERIMENTAL STUDY ON FLEXURAL FATIGUE PERFORMANCE OF DAMAGEDREINFORCED CONCRETE BEAMS STRENGTHENED WITH BFRP SHEETS[J]. Fiber Reinforced Plastics/Composites, 2016, 0(6): 25-32.

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