Email Alerts
RSS
Fatigue crack propagation model of concrete under water pressure based on energy approach
-
摘要: 针对低频疲劳荷载与孔隙水压力的耦合作用，将混凝土疲劳裂缝扩展所消耗的能量分为两部分，一部分由低频疲劳荷载提供，另一部分由孔隙水压力提供，并给出了两部分能量的计算方法。基于能量的可叠加原理，结合混凝土断裂过程中能量释放率的概念，建立了低频疲劳荷载与孔隙水压力耦合作用下混凝土的裂缝扩展模型，并通过试验数据对模型进行了验证。结果表明：当孔隙水压力为0时，模拟曲线与试验数据吻合较好；当孔隙水压力与低频疲劳荷载共同作用时，水压作用会提供闭合裂缝张开时消耗的能量，促进裂缝的扩展，导致裂缝扩展速率增大，且随着孔隙水压力的增大，裂缝扩展速率增加，混凝土疲劳寿命降低。Abstract: For the coupled action of low frequency fatigue loading and pore water pressure, the energy for fatigue crack growth of concrete is usually divided into two aspects. The theoretical approach of energy provided by low frequency fatigue loading and pore water pressure can be derived, respectively. Based on the superposition principle of energy approach, the crack propagation model under the coupled action of low frequency fatigue loading and pore water pressure was developed considering the concept of energy release rate during the fracture of concrete. Then, the theoretical results were validated using available experimental data in the literature. The comparisons indicate that the proposed model agrees reasonably well with experimental data when the pore water pressure is ignored. Moreover, it is found that under the combined action of low frequency fatigue loading and pore water pressure, the pore water pressure can provide the energy dissipated by the opening of closed crack to accelerate the crack growth. Moreover, the crack propagation rate increases with the increase of pore water pressure, which results in the reduction of the fatigue life of concrete.
-
Key words:
- concrete /
- fatigue loading /
- pore water pressure /
- energy approach /
- crack propagation
-
图 2 不同加载方式下裂缝中的水压力方向
Figure 2. Direction of water pressure in cracks under different loading modes
图 4 干燥混凝土裂缝扩展与耗散能之间的关系
Figure 4. Relationship between crack propagation and dissipation energy in dry concrete
图 5 不同水压力下裂缝扩展与耗散能之间的关系
Figure 5. Relationship between crack propagation and dissipation energy under different pore water pressures
图 6 理想状态（左）和实际（右）闭合裂缝示意
Figure 6. Sketch of closed cracks in ideal (left) and actual (right) states
图 8 孔隙水压力与混凝土疲劳寿命的关系
Figure 8. Relationship between pore water pressure and fatigue life of concrete
-
[1] 邢明亮, 关博文, 陈拴发, 等. 硫酸盐腐蚀与疲劳荷载联合作用下混凝土劣化特性[J]. 建筑材料学报,2013,16(2):249-254. (XING Mingliang, GUAN Bowen, CHEN Shuanfa, et al. Deterioration characteristics of concrete under sulfate erosion and fatigue load[J]. Journal of Building Materials, 2013, 16(2): 249-254. (in Chinese) doi: 10.3969/j.issn.1007-9629.2013.02.012 [2] 蒋林华, 朱承龙, 徐宁, 等. 拉伸疲劳对混凝土氯离子扩散的影响[J]. 建筑材料学报,2016,19(3):456-460. (JIANG Linhua, ZHU Chenglong, XU Ning, et al. Effect of tensile fatigue on diffusion of chloride ion in concrete[J]. Journal of Building Materials, 2016, 19(3): 456-460. (in Chinese) doi: 10.3969/j.issn.1007-9629.2016.03.007 [3] HAYNES H H, HIGHBERG R S. Concrete properties at ocean depths[J]. Journal of the Waterways,Harbors and Coastal Engineering Division, 1976, 102(4): 455-470. [4] 谢京辉, 彭刚, 陈灯红, 等. 不同初始孔隙水压力下混凝土动态力学特性[J]. 水利水运工程学报,2017(3):99-106. (XIE Jinghui, PENG Gang, CHEN Denghong, et al. Dynamic properties of concrete under different initial pore water pressure[J]. Hydro-Science and Engineering, 2017(3): 99-106. (in Chinese) [5] 邓媛, 邹荣华, 彭刚, 等. 孔隙水压循环次数对混凝土损伤影响[J]. 水利水运工程学报,2016(6):83-89. (DENG Yuan, ZOU Ronghua, PENG Gang, et al. Influences of pore water cycles on damage properties of concrete under triaxial compression tests[J]. Hydro-Science and Engineering, 2016(6): 83-89. (in Chinese) [6] 王海龙, 李庆斌. 饱和混凝土静动力抗压强度变化的细观力学机理[J]. 水利学报,2006,37(8):958-962, 968. (WANG Hailong, LI Qingbin. Micro-mechanism of static and dynamic strengths for saturated concrete[J]. Journal of Hydraulic Engineering, 2006, 37(8): 958-962, 968. (in Chinese) doi: 10.3321/j.issn:0559-9350.2006.08.010 [7] 王海龙, 李庆斌. 孔隙水对湿态混凝土抗压强度的影响[J]. 工程力学,2006,23(10):141-144, 179. (WANG Hailong, LI Qingbin. Effect of pore water on the compressive strength of wet concrete[J]. Engineering Mechanics, 2006, 23(10): 141-144, 179. (in Chinese) doi: 10.3969/j.issn.1000-4750.2006.10.027 [8] 黄常玲, 刘长武, 高云瑞, 等. 孔隙水压力条件下混凝土的破坏机理[J]. 四川大学学报(工程科学版),2015,47(增刊2):76-80. (HUANG Changling, LIU Changwu, GAO Yunrui, et al. Failure mechanism of concrete under pore water pressure[J]. Journal of Sichuan University (Engineering Science Edition), 2015, 47(Suppl2): 76-80. (in Chinese) [9] MORROW J. Cyclic plastic strain energy and fatigue of metals[M]//LAZAN B. Internal Friction, Damping, and Cyclic Plasticity. West Conshohocken, PA: ASTM International, 1965: 45-84. [10] MARTIN D E. An energy criterion for low-cycle fatigue[J]. Journal of Fluids Engineering, 1961, 83(4): 565-576. [11] ONOUE K, MATSUSHITA H. Reduction mechanisms of fatigue strength of concrete under compression due to permeation of liquids[J]. Construction and Building Materials, 2012, 37: 82-92. doi: 10.1016/j.conbuildmat.2012.07.010 [12] LEI D, ZHANG P, HE J T, et al. Fatigue life prediction method of concrete based on energy dissipation[J]. Construction and Building Materials, 2017, 145: 419-425. doi: 10.1016/j.conbuildmat.2017.04.030 [13] 徐世烺. 混凝土断裂力学[M]. 北京: 科学出版社, 2011. XU Shilang. Fracture mechanics of concrete[M]. Beijing: Science Press, 2011.（in Chinese） [14] ELLYIN F. Fatigue damage, crack growth, and life prediction[M]. New York: Chapman and Hall, 1997. [15] MAZARI M, BOUCHOUICHA B, ZEMRI M, et al. Fatigue crack propagation analyses based on plastic energy approach[J]. Computational Materials Science, 2008, 41(3): 344-349. doi: 10.1016/j.commatsci.2007.04.016 [16] PERDIKARIS P C, CALOMINO A M, CHUDNOVSKY A. Effect of fatigue on fracture toughness of concrete[J]. Journal of Engineering Mechanics, 1986, 112(8): 776-791. doi: 10.1061/(ASCE)0733-9399(1986)112:8(776) [17] DATTOMA V, GIANCANE S. Evaluation of energy of fatigue damage into GFRC through digital image correlation and thermography[J]. Composites Part B: Engineering, 2013, 47: 283-289. [18] SHADMAN M, ZIARI H. Laboratory evaluation of fatigue life characteristics of polymer modified porous asphalt: A dissipated energy approach[J]. Construction and Building Materials, 2017, 138: 434-440. doi: 10.1016/j.conbuildmat.2017.02.043 [19] SHAH S G. Fracture and fatigue behavior of concrete-concrete interfaces using acoustic emission, digital image correlation and micro-indentation techniques[D]. Bangalore: Indian Institute of Science, 2009. [20] FATHIMA K M P, KISHEN J M C. Prediction of fatigue life in plain concrete using entropy production[J]. Journal of Engineering Mechanics, 2015, 141(7): 04015007. doi: 10.1061/(ASCE)EM.1943-7889.0000936 [21] JENQ Y, SHAH S P. Two parameter fracture model for concrete[J]. Journal of Engineering Mechanics, 1985, 110(10): 1227-1241. [22] 吴智敏, 杨树桐, 郑建军. 混凝土等效断裂韧度的解析方法及其尺寸效应[J]. 水利学报,2006,37(7):795-800. (WU Zhimin, YANG Shutong, ZHENG Jianjun. Analytical method for predicting effective fracture toughness of concrete and its size effect[J]. Journal of Hydraulic Engineering, 2006, 37(7): 795-800. (in Chinese) doi: 10.3321/j.issn:0559-9350.2006.07.005 [23] HU S W, LU J. Experimental research and analysis on double-K fracture parameters of concrete[J]. Advanced Science Letters, 2012, 12(1): 192-195. doi: 10.1166/asl.2012.2806 [24] 李世愚, 和泰名, 尹祥础. 岩石断裂力学导论[M]. 合肥: 中国科学技术大学出版社, 2010. LI Shiyu, HE Taiming, YIN Xiangchu. Introduction of rock fracture mechanics[M]. Hefei: University of Science and Technology of China Press, 2010.（in Chinese） [25] 张鹏, 孙志伟, 赵铁军, 等. 海水环境下混凝土的断裂能及其应变软化[J]. 土木建筑与环境工程,2010,32(1):72-77. (ZHANG Peng, SUN Zhiwei, ZHAO Tiejun, et al. Fracture energy and strain softening of concrete under seawater environment[J]. Journal of Civil, Architectural and Environmental Engineering, 2010, 32(1): 72-77. (in Chinese) -
下载:
点击查看大图
图(8) / 表 (1)
计量
- 文章访问数: 363
- HTML全文浏览量: 173
- PDF下载量: 16
- 被引次数: 0
