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浙江大学学报(工学版)
土木与交通工程     
冻融损伤混凝土的弯曲疲劳寿命可靠性分析
欧祖敏, 孙璐
1. 广东珠三角城际轨道交通有限公司,广东 广州 510308; 
2. 东南大学 交通学院,江苏 南京 210096;
3. 美国华盛顿Catholic大学 土木工程系,美国 华盛顿 20064
Flexural fatigue-life reliability of frost-damaged concrete
OU Zu-min, SUN Lu
1. Guangdong Pearl River Delta Intercity Railway Co. Ltd, Guangzhou 510308, China;
2. School of Transportation, Southeast University, Nanjing 210096, China;
3. Department of Civil Engineering, The Catholic University of America, Washington DC 20064, USA
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摘要:

为了研究冻融损伤效应对混凝土弯曲疲劳寿命的影响,通过三点弯曲疲劳试验研究经快速冻融法水冻至不同损伤程度的混凝土小梁疲劳寿命;并用两参数威布尔分布函数对弯曲疲劳寿命试验数据进行拟合和检验;对混凝土弯曲疲劳寿命的可靠性进行分析并建立具有不同可靠性概率的P-S-N曲线.研究结果表明:混凝土的静弯曲强度、疲劳强度和疲劳寿命都随着冻融循环(FTC)次数的增加而急剧减小.K-S检验结果表明:混凝土弯曲疲劳寿命能很好地服从威布尔分布;利用矩估计法获得的威布尔分布参数的混凝土弯曲疲劳寿命的分散性随应力水平的增大而减小,随冻融作用次数的增加而增加.可靠性分析结果表明:混凝土弯曲疲劳寿命的可靠性概率随着冻融次数的增加而有所降低,对混凝土弯曲疲劳寿命(强度)进行设计和验算时应适当增大受冻融损伤混凝土的可靠性概率(安全系数).

Abstract:

The three-point bending tests were conducted on concrete beam specimens which were first frost-damaged by the rapid frozen-thaw method in order to investigate the effect of frost-damaged on flexural fatigue life of concrete. A two-parameter Weibull distribution model was introduced to describe the experimental flexural fatigue life and the reliability probability analysis was carried out to calculate the theoretical flexural fatigue life for the frost-damaged concrete. Based on the experimental and theoretical studies, the relationship of the fatigue life-fatigue strength and the P-S-N curve was obtained. It is shown that static flexural strength, flexural fatigue strength and life significant decrease as the number of freeze-thaw cycles (FTC) increase. The tested results of the K-S test indicate that the two-parameter Weibull distribution function can appropriately describe the probability distribution of flexural fatigue life. Results of the estimated shape parameter of the Weibull distribution by the method of moments show that the scatter of the flexural fatigue life increases with the increase of  the number of FTC. Reliability analysis results indicate that the reliability probability(safety factor)of the flexural fatigue life for the frost-damaged concrete decrease as the number of FTC increase. For the concrete structure service in cold climate regions, it is necessary to increase the value of safety factor of the flexural fatigue life(strength) to resist the fatigue loading.

出版日期: 2017-06-11
CLC:  TU 528.01  
基金资助:

国家自然科学基金重点资助项目(U1134206);国家自然科学基金外青学者资助项目(51250110075,513111130).

通讯作者: 孙璐,男,教授,博导.     E-mail: sunl@cua.edu
作者简介: 欧祖敏(1983—),男,工程师,博士,从事铁路无砟轨道结构设计理论与方法研究和城际铁路建设技术管理. ORCID: 0000-0001-7603-4897. E-mail: ouzumin@163.com
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引用本文:

欧祖敏, 孙璐. 冻融损伤混凝土的弯曲疲劳寿命可靠性分析[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2017.06.003.

OU Zu-min, SUN Lu. Flexural fatigue-life reliability of frost-damaged concrete. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2017.06.003.

参考文献(References):
[1] 李钧,王宗林.冻融循环作用对混凝土毛细孔结构的劣化机制及改善措施[J].建筑技术,2016, 47(6): 491-494.
LI Jun, WANG Zong-lin. Freeze-thaw cycle effect on degradation mechanism of concrete pore structure and improvement measures[J]. Architecture Technology, 2016, 47(6): 491-494.
[2] SUN W, ZHANG Y M, YAN H D, et al. Damage and damage resistance of high strength concrete under the action of load and freezethaw cycles [J]. Cement and Concrete Research, 1999, 29(9): 1519-1523.
[3] 邹超英,赵娟,梁锋,等.冻融作用后混凝土力学性能的衰减规律[J].建筑结构学报,2008,29(1): 117-123.
ZOU Chao-ying, ZHAO Juan, LIANG Feng, et al. Degradation of mechanical properties of concrete caused by freeze-thaw action [J]. Journal of Building Structures, 2008, 29(1): 117-123.
[4] 洪锦详,缪昌文,刘加平,等.冻融损伤混凝土力学性能衰减规律[J].建筑材料学报,2012,15(2): 173-178.
HONG Jin-xiang, MIAO Chang-wen, LIU Jia-ping, et al. Degradation law of mechanical properties of concrete subjected to freeze-thaw cycles [J]. Journal of Building Materials, 2012,15(2): 173-178.
[5] BEAUDOIN J J, MACINNIS C. The mechanism of frost damage in hardened cement paste [J]. Cement and Concrete Research, 1974, 4(2): 139-147.
[6] FAGERLUND G. The international cooperative test of the critical degree of saturation method of assessing the freeze/thaw resistance of concrete [J]. Matériauxet Construction, 1977, 10(4): 231-253.
[7] 郭寅川,申爱琴,何天钦,等.疲劳荷载与冻融循环耦合作用下季冻区路面水泥混凝土孔结构研究[J].中国公路学报,2016,29(8): 29-35.
GUO Yin-chuan, SHEN Ai-qin, HE Tian-qin, et al. Pore structure research on pavement cement concrete subjected to coupling effect of fatigue load and cyclic freeze-thaw in seasonally frozen ground region [J]. China Journal of Highway and Transport, 2016, 29(8):29-35.
[8] LI W, SUN W, JIANG J. Damage of concrete experiencing flexural fatigue load and closed freeze/thaw cycles simultaneously [J]. Construction and Building Materials, 2011, 25(5): 2604-2610.
[9] 田威,邢凯,谢永利.冻融环境下混凝土损伤劣化机制的力学试验研究[J].实验力学,2015,30(3): 299-304.
TIAN Wei, XING Kai, XIE Yong-li. Experimental study of damage degradation mechanism of concrete in freeze-thaw environment [J]. Journal of Experimental Mechanics, 2015,30(3): 299-304.
[10] 关虓,牛荻涛,沈可欣,等.气冻气融环境下钢筋混凝土梁抗冻性研究[J].建筑材料学报,2016, 19(3):461-466.
GUAN Xiao, NIU Di-tao, SHEN Ke-xin, ZHANG Yong-li. Frost-resistance of RC beam under atmospheric freeze-thaw cycles [J]. Journal of Building Materials, 2016, 19(3): 461-466.
[11] PENTTALA V, Al-NESHAWY F. Stress and strain state of concrete during freezing and thawing cycles [J]. Cement and Concrete Research, 2002, 32(9): 1407-1420.
[12] 徐善华,王友德,李安邦,等.冻融损伤混凝土重复受压本构关系[J].哈尔滨工业大学学报,2015,47(4):104-110.
XU Shan-hua, WANG You-de, LI An-bang, et al. Dynamic constitutive relation of concrete with freeze-thaw damage under repeated loading [J]. Journal of Harbin Institute of Technology, 2015,47(4): 104-110.
[13] HANJARI K Z, KETTIL P, LUNDGREN K. Modelling the structural behaviour of frost-damaged reinforced concrete structures [J]. Structure and Infrastructure Engineering, 2013, 9(5): 416-431.
[14] HASAN M, UEDA T, SATO Y. Stress-strain relationship of frost-damaged concrete subjected to fatigue loading [J]. Journal of Materials in Civil Engineering, 2008, 20(1): 37-45.
[15] LI W, JIANG Z, YANG Z, et al. Interactive effect of mechanical fatigue load and the fatigue effect of freezethaw on combined damage of concrete [J]. Journal of Materials in Civil Engineering, 2015, 27(8): 1-13.
[16] 中华人民共和国国家标准.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009 [S].北京:中国建筑工业出版社,2009.
[17]  TEPFERS R. Tensile fatigue strength of plain concrete [J]. Journal of the American Concrete Institute, 1979, 76(8): 919-934.
[18] OH B. Fatigue analysis of plain concrete in flexure [J]. Journal of Structural Engineering,1986,112(2): 273-288.
[19] American Society for Testing. A guide for fatigue testing and the statistical analysis of fatigue data [M]. Philadelphia: American Society for Testing and Materials, 1963.
[20] MOHAMMADI Y, KAUSHIK S K. Flexural fatigue-life distributions of plain and fibrous concrete at various stress levels [J]. Journal of materials in civil engineering, 2005, 17(6): 650-658.
[21] WEIBULL W. Fatigue testing and analysis of results [M]. Amsterdam: Elsevier, 2013: 184-249.
[22] 南京大学金陵学院大学数学教研室.概率论与数理统计简明教程[M].南京:东南大学出版社,2014: 36-68.

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