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工程力学  2015 

基于分形理论的CFRP布增强混凝土梁抗弯性能研究

DOI: 10.6052/j.issn.1000-4750.2013.11.1009, PP. 160-168

Keywords: 钢筋混凝土梁,表面裂缝,分形维数,CFRP,损伤深度,延性

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Abstract:

在实验室模拟酸雨腐蚀环境,完成了普通混凝土梁与CFRP布增强混凝土梁的抗弯试验,得到了各级荷载作用下构件表面裂缝的分布与演化过程,验证了受腐蚀CFRP布增强混凝土梁表面裂缝分布的分形特征。基于分形理论分析了受腐蚀混凝土梁在弯曲荷载作用下的开裂及破坏过程,详细讨论了梁表面裂缝的分形维数与其抗弯性能参数(损伤深度、混凝土强度、一阶频率、极限承载力、跨中挠度、位移延性系数)之间的关系。研究表明裂缝分形维数随着损伤深度的增加而减小,CFRP布增强混凝土梁的分形维数大于普通混凝土梁,其分形维数变化率与构件承载力变化率之间存在线性关系;因此梁表面裂缝分布的分形特征可作为CFRP布增强混凝土受弯构件损伤程度的衡量指标的观点,可为今后对“在役混凝土结构承载力和寿命预测的研究”提供参考。

References

[1]  Fan Y F, Hu Z Q, Zhang Y Z, et al. Deterioration of compressive property of concrete under simulated acid rain environment [J]. Construction and Building Materials, 2010, 24(10): 1975―1983.
[2]  Rania A, Khaled S, Timothy H. Fatigue flexural behavior of corroded reinforced concrete beams repaired with CFRP sheets [J]. Journal of Composites for Construction (ASCE), 2011, 15(1): 42―51.
[3]  Indrajit R, George C, Julio F. Effect of concrete substrate repair methods for beams aged by accelerated corrosion and strengthened with CFRP [J]. Journal of Aerospace Engineering (ASCE), 2011, 24(2): 227―239.
[4]  Viktor M. Fracture mechanical behavior of concrete and the condition of its fracture surface [J]. Cement and Concrete Research, 2009, 39(7): 620―628.
[5]  Savas E, Marva A B. Fractal-fracture analysis and characterization of impact-fractured surfaces in different types of concrete using digital image analysis and 3D nanomap laser profilometery [J]. Construction and Building Materials, 2013, 40: 70―76.
[6]  Andrea C, Roberto B. Fracture behaviour of plain and fiber-reinforced concrete with different water content under mixed mode loading [J]. Materials and Design, 2010, 31(4): 2032―2042.
[7]  Yan A, Wu K R, Zhang D, et al. Influence of concrete composition on the characterization of fracture surface [J]. Cement & Concrete Composites, 2003, 25(1): 153―157.
[8]  Carpinteri A, Lacidogna G, Niccolini G. Fractal analysis of damage detected in concrete structural elements under loading [J]. Chaos, Solitons and Fractals, 2009, 42(4): 2047―2056.
[9]  Alireza A, Seyed S, Farshad R. Quantifying the effects of crack width, tortuosity, and roughness on water permeability of cracked mortars [J]. Cement and Concrete Research, 2012, 42(2): 313―320.
[10]  郑山锁, 任梦宁, 谢明, 等. 混凝土断裂面多重分形谱的二次拟合研究[J]. 工程力学, 2012, 30(5): 97―102. Zheng Shansuo , Ren Mengning, Xie Ming, et al. Study on quadratic fitting of multi-fractal spectrum of fracture surface in concrete [J]. Enginering Mechanics, 2012, 30(5): 97―102. (in Chinese)
[11]  范颖芳, 周晶, 冯新. 受腐蚀钢筋混凝土构件破坏过程的分形行为[J]. 工程力学, 2002, 19(10): 123―129. Fan Yingfang, Zhou Jing, Feng Xin. The fractal behavior on failure process of reinforced concrete member under corroded [J]. Enginering Mechanics, 2002, 19(10): 123―129. (in Chinese)
[12]  曹茂森, 任青文. 钢筋混凝土结构损伤检测的分形特征因子[J]. 土木工程学报, 2005, 38(12): 59―64. Cao Maosen, Ren Qingwen. Damage detection of reinforced concrete structures based on fractal characteristic factor [J]. China Civil Engineering Journal, 2005, 38(12): 59―64. (in Chinese)
[13]  李艳艳, 戎贤, 王铁成. 高强箍筋混凝土梁裂缝分布的分形特征[J]. 工程力学, 2009, 26(增刊I): 72―76. Li Yanyan, Rong Xian, Wang Tiecheng. Fractal characteristics of crack distribution of concrete beams with high strength stirrup [J]. Enginering Mechanics, 2009, 26(Suppl I): 72―76. (in Chinese)
[14]  张建仁, 余常, 王磊, 等. 锈蚀钢筋混凝土梁开裂的分形特征[J]. 交通科学与工程, 2010, 26(1): 29―34. Zhang Jianren, Yu Chang, Wang Lei, et al. Fractal characteristics of cracks for corroded reinforced concrete beams [J]. Journal of Transport Science and Engineering, 2010, 26(1): 29―34. (in Chinese)
[15]  Carpinteri A, Lacidogna G, Pugno N. Structural damage diagnosis and life-time assessmentby acoustic emission monitoring [J]. Engineering Fracture Mechanics, 2007, 74(1/2): 273―289.
[16]  Issa M A, Islam M, Chudnovsky A, et al. Fractal dimension-a measure of fracture roughness and toughness of concrete [J]. Engineering Fracture Mechanics, 2003, 70(1): 125―137.
[17]  Wang L, Wang L D, Fei W D. Fractal analysis of fracture surfaces in aluminium borate whisker-reinforced aluminium alloy 6061 composite [J]. Transactions of Nonferrous Metals Society of China, 2011, 21(3): 461―466.
[18]  Mandelbrot B B. Fractal geometry of nature [M]. San Francisco: W. H. Freeman and Company, 1982: 161―192.
[19]  Zachary B H, Kevin R M. Mechanical and environmental loading of concrete beams strengthened with epoxy and polyurethane matrix carbon fiber laminates [J]. Construction and Building Materials, 2012, 26(1): 604―612.
[20]  GB/T 50152-2012, 混凝土结构试验方法标准[S]. 北京: 中国建筑工业出版社, 2012. GB/T 50152-2012, Standard methods for testing of concrete structures [S]. China Architecture & Building Press, 2012. (in Chinese)
[21]  范颖芳, 王大为, 栾海洋. 模拟酸沉降环境混凝土梁承载性能研究[J]. 工程力学, 2014, 31(4): 147―154. Fan Yingfang, Wang Dawei, Luan Haiyang. Study on the load carrying capacity of reinforced concrete beams under acid precipitation [J]. Enginering Mechanics, 2014, 31(4): 147―154. (in Chinese)

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