ALKALI SOLUTION FATIGUE UNDER COUPLING ACTION OF BFRP REINFORCED BENDING EXPERIMENTAL STUDY ON THE DAMAGE OF REINFORCED CONCRETE BEAM

Abstract

Abstract: Based on the complex environment and the particular load of the bridge structure, this paper attempts to explore the performance of damaged RC beams strengthened with BFRP sheets in alkali solution environment and fatigue loading. Damaged RC beams strengthened with two layers of BFRP sheets in alkali solution environment where the pH values are 7,9,10 and fatigue loading have been carried out. Test results show that even under the coupling of the alkali solution and the fatigue loading, the BFRP sheets can improve the ultimate bearing capacity and flexural rigidity of damaged RC beams. Under the same fatigue times, in solution environment where the pH value is 9, the deflection of the beams effected by 90 days increased by 23.13% as compared to the beams effected by 60 days. When other parameters are same, the bending strength of beams effected by alkali solution where the pH values are 7 and 10 decreased by 10.06% and 21.15% relative to beams without environment effect. So, with the increase of the concentration of alkali solution and the time of action, the ultimate bearing capacity, flexural rigidity and anti fatigue properties of RC beams decreased significantly. Finally, regarding the deflection changes as fatigue damage index, we fitted deformation modulus of strengthened beams, with the consideration of the pH value and the fatigue times.

Key words: alkali solution, damage reinforced concrete beam, the basalt fiber cloth, coupling effect of environmental fatigue, fatigue deformation modulus

CLC Number:

TB332

WANG Hai-liang, LI Long. ALKALI SOLUTION FATIGUE UNDER COUPLING ACTION OF BFRP REINFORCED BENDING EXPERIMENTAL STUDY ON THE DAMAGE OF REINFORCED CONCRETE BEAM[J]. Fiber Reinforced Plastics/Composites, 2016, 0(8): 38-43.

References

[1] 李鹏. 腐蚀环境下钢筋混凝土结构疲劳性能研究[D]. 长沙: 中南大学, 2009.
[2] 贺拴海, 赵小星, 宋一凡, 等. 具有初荷载的钢筋混凝土梁桥粘贴碳纤维布加固试验研究[J]. 土木工程学报, 2005, 38(3): 70-76.
[3] 叶列平, 冯鹏. FRP在工程结构中的应用与发展[J]. 土木工程学报, 2006, 39(3): 24-34.
[4] 孙晓燕, 黄承逵. 外贴纤维布加固超载后钢筋混凝土桥梁构件抗弯性能试验[J]. 中国公路学报, 2006, 19(4): 82-87.
[5] 王文炜, 赵国藩, 李果. 玻璃纤维布加固钢筋混凝土梁抗弯性能试验研究[J]. 大连理工大学学报, 2003, 43(6): 799-804.
[6] 邓宗才, 张连普, 张鹏飞. AFRP加固已腐蚀混凝土梁疲劳性能试验研究[J]. 建筑结构, 2009, 39(3): 99-102.
[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] 欧阳利军, 丁斌, 陆洲导, 等. 玄武岩纤维与碳纤维加固连续梁抗弯试验研究[J]. 同济大学学报(自然科学版), 2013, 41(9): 1341-1342.
[9] 欧阳利军, 陆洲导, 丁斌. 玄武岩纤维布加固混凝土连续梁抗弯试验研究[J]. 玻璃钢/复合材料, 2013(2): 3-7.
[10] 刘华新, 孙英明, 王学志, 等. 玄武岩纤维布抗剪加固破损钢筋混凝土深梁的应变分析[J]. 玻璃钢/复合材料, 2015(1): 64-68.
[11] 杨勇新, 陈绪军, 刑建英, 等. 玄武岩纤维布加固混凝土梁的抗弯疲劳性能试验[J]. 华侨大学学报(自然科学版), 2010, 31(4): 443-447.
[12] 陈绪军, 李华锋, 杨勇新. 混杂纤维布加固混凝土梁抗弯疲劳性能试验研究[J]. 工业建筑, 2012,42(006): 77-82.
[13] 刘永胜, 童谷生, 熊智文. 纤维布加固混凝土梁的疲劳损伤研究[J]. 混凝土, 2010(9): 38-45.
[14] 混凝土结构设计规范, GB 50010—2010[S]. (2015局部修订版): 北京: 中国建筑出版社, 2010.
[15] 陆烜, 邱洪兴, 庞林飞. 碳纤维布加固钢筋混凝土受弯构件的疲劳性能研究[J]. 工业建筑增刊, 2005(35): 962-965.
[16] 李秀芬, 吴佩港, 赵光仪. 高等混凝土梁抗弯疲劳性能的试验研究[J]. 土木工程学报, 1997, 30(5): 37-42.