预应力AFRP加固锈蚀钢筋混凝土梁的疲劳性能研究
摘要
本文对带永久锚具的预应力芳纶纤维布(AFRP)加固锈蚀钢筋混凝土梁的疲劳性能进行试验与研究。以7根AFRP加固锈蚀钢筋混凝土梁的疲劳试验为基础,探讨了AFRP的预应力水平(控制应力分别为纤维布强度0%、45%和65%)和钢筋锈蚀程度(中度6%、重度12%)对锈蚀梁疲劳破坏形态、疲劳寿命、跨中挠度、各种材料应变的影响,研究了钢筋锈蚀对钢筋混凝土梁疲劳寿命的影响。试验结果表明:预应力与非预应力AFRP加固锈蚀钢筋混凝土梁的疲劳破坏机制相同,都为纵筋的疲劳断裂;预应力AFRP加固锈蚀混凝土梁的抗疲劳特性明显优于非预应力加固梁,且预应力水平越高,加固梁的疲劳寿命越高;锈蚀使钢筋表面形成应力集中点,使梁的疲劳寿命大大降低,且钢筋的锈蚀率越高,梁的疲劳寿命就会越低,重度锈蚀梁疲劳寿命的降低幅度比中度锈蚀梁更明显。通过与光面钢筋对比,获得了锈蚀纵筋的等效疲劳切口系数K f。结果表明,钢筋锈蚀率的增加会导致K f增大,从而导致锈蚀梁疲劳寿命明显降低。在对试验结果分析的基础上,本文还推导出中度锈蚀钢筋的疲劳S-N曲线,可供实际工程加固设计时参考。
In this paper, a primary study on fatigue behaviors of strengthening corroded RC beams using non-prestressed aramid fiber reinforced polymer (AFRP) sheets and prestressed AFRP sheets with permanent anchor was carried out. Based on the fatigue experimental results, the effects of different pre-stress level of AFRP sheets under different ratio of corrosion (moderate corroded: reinforcement mass loss is 6.0%, severe corroded: reinforcement mass loss is 12%) on the properties of the fatigue failure, fatigue life and mid-span deflection were analyzed. The experimental results showed that, the fatigue failure mechanism of the corroded RC beams strengthened with AFRP sheets is the fatigue fracture of steel bar. Comparing between the beams strengthened with prestressed AFRP sheets and the beams with non-prestressed AFRP sheets, the fatigue life was increased. The fatigue life of the retrofit RC beams increased with the increase of the pre-stress level of AFRP sheets. Pitting resulted in a geometry that increased the stress concentration factor, this led to the significant reduction observed in the fatigue life. And the fatigue life of the corroded RC beams decrease with the increase of the ratio of corrosion. The fatigue results were compared to smooth specimen fatigue data to estimate an equivalent fatigue notch factor K f for the main reinforcing bars of the tested specimens. Pitting corrosion resulted in the increase in the fatigue notch factor, this increase resulted in a significant reduction in the fatigue life. Based on experimental study,this paper gives the“S-N”curve of the moderate corroded reinforcement, and it can be a reference for factual projects design.
In this paper, a primary study on fatigue behaviors of strengthening corroded RC beams using non-prestressed aramid fiber reinforced polymer (AFRP) sheets and prestressed AFRP sheets with permanent anchor was carried out. Based on the fatigue experimental results, the effects of different pre-stress level of AFRP sheets under different ratio of corrosion (moderate corroded: reinforcement mass loss is 6.0%, severe corroded: reinforcement mass loss is 12%) on the properties of the fatigue failure, fatigue life and mid-span deflection were analyzed. The experimental results showed that, the fatigue failure mechanism of the corroded RC beams strengthened with AFRP sheets is the fatigue fracture of steel bar. Comparing between the beams strengthened with prestressed AFRP sheets and the beams with non-prestressed AFRP sheets, the fatigue life was increased. The fatigue life of the retrofit RC beams increased with the increase of the pre-stress level of AFRP sheets. Pitting resulted in a geometry that increased the stress concentration factor, this led to the significant reduction observed in the fatigue life. And the fatigue life of the corroded RC beams decrease with the increase of the ratio of corrosion. The fatigue results were compared to smooth specimen fatigue data to estimate an equivalent fatigue notch factor K f for the main reinforcing bars of the tested specimens. Pitting corrosion resulted in the increase in the fatigue notch factor, this increase resulted in a significant reduction in the fatigue life. Based on experimental study,this paper gives the“S-N”curve of the moderate corroded reinforcement, and it can be a reference for factual projects design.
引文
1. P.K.Mehta.Concrete durability-fifity years progress. Proc.of 2nd Inter. On Concrete Durability ACI SP.1991,126(1):1~31
2. Prezzi.Monica, Geyskens.Philippe, Monteiro.Paulo J.M. Reliability approach to service life prediction of concrete exposed to marine environments. ACI Materials Journal. 1996, 93(6):544~552
3. Feliu.S, Rodriguez.P, Ramirez.E, Alonso.C, Andrade.C. Some questions on the corrosion of steel in concrete. Materials and Structures/Materiaux et Constructions. 1996,29(185): 40~46
4. 龚洛书, 柳春圃. 混凝土的耐久性及其防护修补. 中国建筑工业出版社. 1990: 26~35
5. 卢木. 混凝土耐久性研究现状和研究方向. 工业建筑. 1997,27(5):1~6
6. R.K.Dhir, M.R.Jones. Rapid estimation of chloride diffusion concrete. Magazine Research, 1990, 42(152):177~185
7. 屈文俊. 现有混凝土桥梁的耐久性评估及寿命预测. 西南交通大学博士学位论文,1995:10~16
8. 张恺, 包琪玮. 北京地区立交桥梁耐久性调查分析. 工程科技论坛——土建结构工程的安全性与耐久性,北京,2001.11,228~231
9. 金伟良, 赵羽习. 混凝土结构耐久性. 科学出版社,2002:11~21
10. 翟爱良, 孙兆明, 冯耀奇. 粘钢加固混凝土梁疲劳性能的试验研究. 青岛建筑工程学院学报. 2002,23(3):7~11
11. 岳清瑞. 我国碳纤维(CFRP)加固修复技术研究应用现状与展望. 工业建筑.2000,30(10):23~25
12. 万墨林 , 马颖军 . 粘钢加固混凝土梁抗疲劳性能试验研究 . 建筑科学.1994,30(1):23~28
13. Abdullah A, Almusallam. Effect of degree of corrosion on the properties of reinforcing steel bars. Construction and Building Materials. 2001,15(8):361~ 368
14. Mohsen Shahawy, Tohomas E.Beitelman. Static and fatigue performanceof RC beams strengthened with CFRP laminates. Structure Engineering. 2004,125(6): 613~621
15. Catalin Gheorghiul, Pierre Labossiere, Alexandre Raiche. Environmental fatigueand static behavior of RC beams strengthened with carbon-fiber- reinforced polvmer. Comnos.Constr., 2004,8(3):211~218
16. Raafat El-Hacha, M.ASCE, R.Gordon Wight, Mark F. Green. Prestressed carbon fiber reinforced polymer sheets for strengthening concrete beams at room and low temperatures. Journal of Composites for Construction. 2004, 8(1): 3~13
17. Triantafillou. Thanasis C, Deskovic. Nikola, Deuring. Martin. Strengthening of concrete structures with prestressed fiber reinforced plastic sheets. ACI Structural Journal. 1992,89(3): 235~244
18. Alsayed. S. H, AL-Salloum. Y.A, Almusallam. T.H. Fiber-reinforced polymer repair materials-some facts. Proceedings of the Institution of Civil Engineers. Civil Engineering. 2000,138(3):131~134
19. 仲伟秋,贡金鑫. 钢筋电化学快速锈蚀试验控制方法. 建筑技术开发. 2001,29(4):28~30
20. 郑晓燕, 吴胜兴. 钢筋混凝土锈蚀参数实验研究. 混凝土与水泥制品. 2005,1(2):4~7
21. 沈德建, 李骁春, 康庆等. 混凝土中钢筋锈蚀电化学分析与室内快速锈蚀试验技术. 建筑技术开发. 2003,30(2):35~37
22. 王海超, 贡金鑫, 邹龙江. 钢筋混凝土梁腐蚀疲劳断裂微观结构分析. 大连理工大学学报. 2005,45 (5):692~699
23. 王海超, 贡金鑫, 曲秀华. 钢筋混凝土梁腐蚀后疲劳性能的试验研究. 土木工程学报. 2005,38(11):32~37
24. 王海超, 贡金鑫, 何世钦. 腐蚀环境相同应力水平混凝土梁的静动力性能研究. 哈尔滨工业大学学报. 2005,37 (11):1526~1528
25. Sobhy Masoud, Khaled Soudki, Tim Topper. CFRP-strenghtened and corroded RC beams under monotonic and fatigue loads. Journal of Composites for Construction. 2001,5(4):228~236
26. Sobhy Masoud, Khaled Soudki, Timothy Topper. Postrepair fatigue performance of FRP-repaired corroded RC beams: experimental and analytical investigation. Journal of Composites for Construction. 2005,9(5): 441~449
27. 李源, 张保印, 刘匀等. 碳纤维布加固混凝土梁的疲劳实验研究. 工业建筑. 2004,34(4):22~24
28. 刘沐宇, 李开兵, 张学明等. 碳纤维布加固损伤混凝土梁的疲劳性能实验.武汉理工大学学报. 2004,26 (4):52~55
29. John Aidoo, Kent A. Harries, Michael F.Petrou. Fatigue behavior of carbon fiberreinforced polymer-strengthened reinforced concrete bridge girders. Journal of Composites for Construction. 2004,8(6): 501~509
30. Barnes R A, Mays G C. Fatigue performance of concrete beams strengthened with CFRP plates . Journal of Composites for Construction. 1999, 3(2): 63~72
31. M Shahawy, Beitelman TE. Static and fatigue performance of RC beam strengthened with CFRP laminates. Journal of Structural Engineering. 1999,125(6): 613~621
32. Christos G Papakonstantinou, Michael F Petrou, Kent A Harries. Fatigue behavior of RC beams strengthened with GFRP sheets. Journal of Composites for Construction. 2001,5(4): 246~253
33. R.G.Weight, Green M F, M.A.Erki. Prestressed FPR sheets for poststrengthening reinforced concrete beams. Journal of Composites for Construction. 2001,5(4):214~220
34. 张轲, 叶列平, 岳清瑞. 预应力碳纤维布加固混凝土梁弯曲疲劳性能研究.工业建筑. 2005,35(8):13~19
35. 邓宗才, 张鹏飞, 李建辉等. 芳纶布预应力加固混凝土梁的疲劳与静载特性.中国公路学报. 2007,20(6):34~41
36. Soudki, Khaled A. Rteil, Ahmad A. Al-Hammoud, Rania. Topper, Timothy H. Fatigue strength of fibre-reinforced-polymer-repaired beams subjected to mild corrosion. Canadian Journal of Civil Engineering. 2007,34(3): 414~421
37. 易伟建, 孙晓东. 锈蚀钢筋混凝土梁疲劳性能试验研究. 土木工程学报.2007, 40(3):6~10
38. A.Castel, R.Francois, G.Arliguie. Mechanical behaviour of corroded reinforced concrete beams-Part2: Bond and notch effects. Materials and Structures / materiaux et constructions. 2000,11(33):545~551
39. 史波, 赵国藩. 基于可靠度的锈蚀钢筋混凝土结构使用寿命预测. 大连理工大学学报. 2007,47(1):61~67
40. 陈传尧. 疲劳与断裂. 华中科技大学出版社. 2001:1~3
41. 曹 建 安 , 文 雨 松 . 锈 蚀 钢 筋 的 疲 劳 试 验 研 究 . 长 沙 铁 道 学 院 学 报 . 1998,16(4):15~18
42. Seadatrmanesh R, Mohammad R. RC strengthening with CFRP plastic: experiment study. Journal of structureal engeineering. 1991,117(11):3417~3433
43. Meier U. Strengthing of structure using carbon fiber composites. Construction and Building Materials. 1995,9(6):341~351
44. 尚守平, 彭晖. 预应力碳纤维布材加固混凝土受弯构件的抗弯性能研究. 建筑结构学报. 2003,10(11):24~30
45. 崔士起, 成勃. 预应力碳纤维加固钢筋混凝土梁试验研究. 四川建筑科学研究. 2005,31(1):51~53
46. R G Wight, M F Green, M-AErki. Prestressed FPR sheets tor poststrengthening reinforced concrete beams. Journal of Camposites for Construction. 2001,11(7): 214~220
47. 张建伟. 混凝土结构中预应力 AFRP 片材加固技术研究. 2006,6:133~135
2. Prezzi.Monica, Geyskens.Philippe, Monteiro.Paulo J.M. Reliability approach to service life prediction of concrete exposed to marine environments. ACI Materials Journal. 1996, 93(6):544~552
3. Feliu.S, Rodriguez.P, Ramirez.E, Alonso.C, Andrade.C. Some questions on the corrosion of steel in concrete. Materials and Structures/Materiaux et Constructions. 1996,29(185): 40~46
4. 龚洛书, 柳春圃. 混凝土的耐久性及其防护修补. 中国建筑工业出版社. 1990: 26~35
5. 卢木. 混凝土耐久性研究现状和研究方向. 工业建筑. 1997,27(5):1~6
6. R.K.Dhir, M.R.Jones. Rapid estimation of chloride diffusion concrete. Magazine Research, 1990, 42(152):177~185
7. 屈文俊. 现有混凝土桥梁的耐久性评估及寿命预测. 西南交通大学博士学位论文,1995:10~16
8. 张恺, 包琪玮. 北京地区立交桥梁耐久性调查分析. 工程科技论坛——土建结构工程的安全性与耐久性,北京,2001.11,228~231
9. 金伟良, 赵羽习. 混凝土结构耐久性. 科学出版社,2002:11~21
10. 翟爱良, 孙兆明, 冯耀奇. 粘钢加固混凝土梁疲劳性能的试验研究. 青岛建筑工程学院学报. 2002,23(3):7~11
11. 岳清瑞. 我国碳纤维(CFRP)加固修复技术研究应用现状与展望. 工业建筑.2000,30(10):23~25
12. 万墨林 , 马颖军 . 粘钢加固混凝土梁抗疲劳性能试验研究 . 建筑科学.1994,30(1):23~28
13. Abdullah A, Almusallam. Effect of degree of corrosion on the properties of reinforcing steel bars. Construction and Building Materials. 2001,15(8):361~ 368
14. Mohsen Shahawy, Tohomas E.Beitelman. Static and fatigue performanceof RC beams strengthened with CFRP laminates. Structure Engineering. 2004,125(6): 613~621
15. Catalin Gheorghiul, Pierre Labossiere, Alexandre Raiche. Environmental fatigueand static behavior of RC beams strengthened with carbon-fiber- reinforced polvmer. Comnos.Constr., 2004,8(3):211~218
16. Raafat El-Hacha, M.ASCE, R.Gordon Wight, Mark F. Green. Prestressed carbon fiber reinforced polymer sheets for strengthening concrete beams at room and low temperatures. Journal of Composites for Construction. 2004, 8(1): 3~13
17. Triantafillou. Thanasis C, Deskovic. Nikola, Deuring. Martin. Strengthening of concrete structures with prestressed fiber reinforced plastic sheets. ACI Structural Journal. 1992,89(3): 235~244
18. Alsayed. S. H, AL-Salloum. Y.A, Almusallam. T.H. Fiber-reinforced polymer repair materials-some facts. Proceedings of the Institution of Civil Engineers. Civil Engineering. 2000,138(3):131~134
19. 仲伟秋,贡金鑫. 钢筋电化学快速锈蚀试验控制方法. 建筑技术开发. 2001,29(4):28~30
20. 郑晓燕, 吴胜兴. 钢筋混凝土锈蚀参数实验研究. 混凝土与水泥制品. 2005,1(2):4~7
21. 沈德建, 李骁春, 康庆等. 混凝土中钢筋锈蚀电化学分析与室内快速锈蚀试验技术. 建筑技术开发. 2003,30(2):35~37
22. 王海超, 贡金鑫, 邹龙江. 钢筋混凝土梁腐蚀疲劳断裂微观结构分析. 大连理工大学学报. 2005,45 (5):692~699
23. 王海超, 贡金鑫, 曲秀华. 钢筋混凝土梁腐蚀后疲劳性能的试验研究. 土木工程学报. 2005,38(11):32~37
24. 王海超, 贡金鑫, 何世钦. 腐蚀环境相同应力水平混凝土梁的静动力性能研究. 哈尔滨工业大学学报. 2005,37 (11):1526~1528
25. Sobhy Masoud, Khaled Soudki, Tim Topper. CFRP-strenghtened and corroded RC beams under monotonic and fatigue loads. Journal of Composites for Construction. 2001,5(4):228~236
26. Sobhy Masoud, Khaled Soudki, Timothy Topper. Postrepair fatigue performance of FRP-repaired corroded RC beams: experimental and analytical investigation. Journal of Composites for Construction. 2005,9(5): 441~449
27. 李源, 张保印, 刘匀等. 碳纤维布加固混凝土梁的疲劳实验研究. 工业建筑. 2004,34(4):22~24
28. 刘沐宇, 李开兵, 张学明等. 碳纤维布加固损伤混凝土梁的疲劳性能实验.武汉理工大学学报. 2004,26 (4):52~55
29. John Aidoo, Kent A. Harries, Michael F.Petrou. Fatigue behavior of carbon fiberreinforced polymer-strengthened reinforced concrete bridge girders. Journal of Composites for Construction. 2004,8(6): 501~509
30. Barnes R A, Mays G C. Fatigue performance of concrete beams strengthened with CFRP plates . Journal of Composites for Construction. 1999, 3(2): 63~72
31. M Shahawy, Beitelman TE. Static and fatigue performance of RC beam strengthened with CFRP laminates. Journal of Structural Engineering. 1999,125(6): 613~621
32. Christos G Papakonstantinou, Michael F Petrou, Kent A Harries. Fatigue behavior of RC beams strengthened with GFRP sheets. Journal of Composites for Construction. 2001,5(4): 246~253
33. R.G.Weight, Green M F, M.A.Erki. Prestressed FPR sheets for poststrengthening reinforced concrete beams. Journal of Composites for Construction. 2001,5(4):214~220
34. 张轲, 叶列平, 岳清瑞. 预应力碳纤维布加固混凝土梁弯曲疲劳性能研究.工业建筑. 2005,35(8):13~19
35. 邓宗才, 张鹏飞, 李建辉等. 芳纶布预应力加固混凝土梁的疲劳与静载特性.中国公路学报. 2007,20(6):34~41
36. Soudki, Khaled A. Rteil, Ahmad A. Al-Hammoud, Rania. Topper, Timothy H. Fatigue strength of fibre-reinforced-polymer-repaired beams subjected to mild corrosion. Canadian Journal of Civil Engineering. 2007,34(3): 414~421
37. 易伟建, 孙晓东. 锈蚀钢筋混凝土梁疲劳性能试验研究. 土木工程学报.2007, 40(3):6~10
38. A.Castel, R.Francois, G.Arliguie. Mechanical behaviour of corroded reinforced concrete beams-Part2: Bond and notch effects. Materials and Structures / materiaux et constructions. 2000,11(33):545~551
39. 史波, 赵国藩. 基于可靠度的锈蚀钢筋混凝土结构使用寿命预测. 大连理工大学学报. 2007,47(1):61~67
40. 陈传尧. 疲劳与断裂. 华中科技大学出版社. 2001:1~3
41. 曹 建 安 , 文 雨 松 . 锈 蚀 钢 筋 的 疲 劳 试 验 研 究 . 长 沙 铁 道 学 院 学 报 . 1998,16(4):15~18
42. Seadatrmanesh R, Mohammad R. RC strengthening with CFRP plastic: experiment study. Journal of structureal engeineering. 1991,117(11):3417~3433
43. Meier U. Strengthing of structure using carbon fiber composites. Construction and Building Materials. 1995,9(6):341~351
44. 尚守平, 彭晖. 预应力碳纤维布材加固混凝土受弯构件的抗弯性能研究. 建筑结构学报. 2003,10(11):24~30
45. 崔士起, 成勃. 预应力碳纤维加固钢筋混凝土梁试验研究. 四川建筑科学研究. 2005,31(1):51~53
46. R G Wight, M F Green, M-AErki. Prestressed FPR sheets tor poststrengthening reinforced concrete beams. Journal of Camposites for Construction. 2001,11(7): 214~220
47. 张建伟. 混凝土结构中预应力 AFRP 片材加固技术研究. 2006,6:133~135