BFRP布加固钢筋混凝土梁的变幅疲劳寿命试验研究
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摘要
通过5根钢筋混凝土梁的抗弯疲劳试验,研究玄武岩纤维布、玄武岩/碳混杂纤维布、玻璃/碳混杂纤维布加固梁的变幅疲劳寿命,并根据Miner损伤理论、修正Miner损伤理论和Corten-Dolan损伤理论,对承受变幅疲劳载荷作用的FRP加固钢筋混凝土梁进行了疲劳寿命估算。结果表明,粘贴纤维布对钢筋混凝土梁的抗疲劳性能有极大改善,能显著提高梁的疲劳寿命;3种损伤理论估算出的寿命均偏安全,以修正Miner损伤理论的精度最好。建议在实际工程应用中采用修正Miner损伤理论进行FRP加固钢筋混凝土受弯构件的变幅疲劳寿命估算。
The flexural fatigue test on 5 reinforced concrete beams is conducted, in which the variable amplitude fatigue lives of RC beams strengthened with basalt fiber sheets,basalt / carbon hybrid fiber sheets and glass / carbon hybrid fiber sheets are studied. According to Miner' s damage theory,modified Miner' s damage theory and Corten-Dolan damage theory,the fatigue life of RC beams strengthened with FRP under variable amplitude fatigue loading is estimated. The result shows that( 1) the fatigue performance of fiber sheet strengthened beams has been greatly improved,and the fatigue life has been significantly increased;( 2) the life estimation values based on the 3 damage theories are conservative,and the modified Miner's damage theory can better predict the fatigue life of specimens. It is suggested to use the modified Miner' s damage theory in estimating the variable amplitude fatigue life of reinforced concrete flexural members strengthened with FRP in practical engineering.
The flexural fatigue test on 5 reinforced concrete beams is conducted, in which the variable amplitude fatigue lives of RC beams strengthened with basalt fiber sheets,basalt / carbon hybrid fiber sheets and glass / carbon hybrid fiber sheets are studied. According to Miner' s damage theory,modified Miner' s damage theory and Corten-Dolan damage theory,the fatigue life of RC beams strengthened with FRP under variable amplitude fatigue loading is estimated. The result shows that( 1) the fatigue performance of fiber sheet strengthened beams has been greatly improved,and the fatigue life has been significantly increased;( 2) the life estimation values based on the 3 damage theories are conservative,and the modified Miner's damage theory can better predict the fatigue life of specimens. It is suggested to use the modified Miner' s damage theory in estimating the variable amplitude fatigue life of reinforced concrete flexural members strengthened with FRP in practical engineering.
引文
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[12]CORTEN H T,DOLON T J.Cumulative Fatigue Damage[C]//Proceeding of the International Conference on Fatigue of Metals.London:IME,1956:235-246.
[2]FERRIER E,BIGAUD D,CLEMENT J C,et al.Fatigue-loading Effect on RC Beams Strengthened with Externally Bonded FRP[J].Construction and Building Materials,2011,25(2):539-546.
[3]邓宗才,李凯.预应力与非预应力AFRP加固腐蚀钢筋混凝土梁疲劳性能研究[J].土木工程学报,2009,42(9):54-60.DENG Zong-cai,LI Kai.Experimental Study on Fatigue Performance Corroded Reinforced Concrete Beams Strengthened with Prestressed AFRP Sheets[J].China Civil Engineering Journal,2009,42(9):54-60.
[4]PAPAKONSTANTINOU C G,PETROU M F,HARRIES K A.Fatigue Behavior of RC Beams Strengthened with GFRP Sheets[J].Journal of Composites for Construction,2001,3(2):246-253.
[5]OUDAH F,EL-HACHA R.Analytical Fatigue Prediction Model of RC Beams Strengthened in Flexure Using Prestressed FRP Reinforcement[J].Engineering Structures,2013,46:173-183.
[6]张海阔.玄武岩纤维布加固混凝土连续梁的疲劳与冻融耐久性研究[D].长春:吉林建筑大学,2015.ZHANG Hai-kuo.Research of Basalt Fiber Sheet Reinforced Concrete Continuous Beam Fatigue and Freezethaw Durability[D].Changchun:Jilin Jianzhu University,2015.
[7]赵少汴.变幅载荷下的有限寿命疲劳设计方法和设计数据[J].机械设计,2000(1):5-8,48.ZHAO Shao-bian.Fatigue Design Methods and Design Data for Finite Life under Variable Amplitude Loading[J].Journal of Machine Design,2000(1):5-8,48.
[8]赵少汴.常用累积损伤理论疲劳寿命估算精度的试验研究[J].机械强度,2000,22(3):206-209.ZHAO Shao-bian.Study on the Accuracy of Fatigue Life Predictions by the Generally Used Damage Accmulation Theory[J].Journal of Mechanical Strength,2000,22(3):206-209.
[9]曾志斌,李之榕.普通混凝土梁用钢筋的疲劳S-N曲线研究[J].土木工程学报,1999,32(5):10-14.ZENG Zhi-bin,LI Zhi-rong.Research on Fatigue S-N Curves of Reinforcing Bars in Common Reinforced Concrete Beams[J].China Civil Engineering Journal,1999,32(5):10-14.
[10]MINER M A.Cumulative Damage in Fatigue[J].Journal of Applied Mechanics,1945,12(3):159-164.
[11]赵少汴,王忠保.抗疲劳设计—方法与数据[M].北京:机械工业出版社,1997.ZHAO Shao-bian,WANG Zhong-bao.Anti-fatigue Design:Methods and Data[M].Beijing:China Machine Press,1997.
[12]CORTEN H T,DOLON T J.Cumulative Fatigue Damage[C]//Proceeding of the International Conference on Fatigue of Metals.London:IME,1956:235-246.
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