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Effect of reinforcement ratio on acoustic emission characteristics during Ⅰ-Ⅱ mixed-mode fracture process of concrete
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摘要: 为了探讨配筋率对混凝土Ⅰ-Ⅱ复合型断裂过程及声发射特征的影响，通过4组直偏裂缝钢筋混凝土三点弯曲梁开展Ⅰ-Ⅱ复合型断裂试验及声发射信号采集，并分析试验结果。结果表明：随着配筋率的增加，失稳荷载近似线性增加，配筋率影响混凝土Ⅰ-Ⅱ复合型断裂模式；裂缝稳定扩展过程中振铃计数出现若干个峰值，累计计数的突变可以表征Ⅰ-Ⅱ复合型断裂临界状态，且3个参数间具有较强的相关性；声发射峰频点均呈现分频段集中的现象，从85%荷载水平开始，140~155 kHz的频段占比减小，30~45 kHz频段占比增加，临近失稳临界状态时峰频分布趋于分散。Abstract: In order to study the effect of reinforcement ratio on fracture property and acoustic emission characteristics of Ⅰ-Ⅱ mixed-mode fracture in concrete, four groups of three-point bending beams with a straight offset notch in reinforced concrete were used for Ⅰ-Ⅱ mixed-mode fracture experiments and collection of acoustic emission signals. The test results were analyzed. The results show that with the increase of reinforcement ratio, the unstable load increases approximately linearly, and reinforcement ratio can influence Ⅰ-Ⅱ mixed-mode fracture mode of concrete. There were several peaks in the ringing counts during the stable fracture propagation. The abrupt change of the cumulative counts could represent the critical states of Ⅰ-Ⅱ mixed-mode fracture, and the three parameters had strong correlation. The peak frequency points of acoustic emission concentrated in different frequency bands. Starting from the 85% load level, the proportion of frequency band in 140~155 kHz decreased, while proportion of frequency band in 30~45 kHz increased. When specimens approached the unstable critical state, the peak frequency distribution tended to disperse.
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图 6 不同配筋率试件荷载与振铃计数时程曲线
Figure 6. Time-history curves of load and AE ringing counting for specimens with different reinforcement ratios
图 7 不同配筋率试件累计计数与荷载时程曲线
Figure 7. Time-history curves of load and cumulative counts for specimens with different reinforcement ratios
图 8 不同配筋率试件的峰频-时间分布
Figure 8. Peak frequency-time distribution for specimens with different reinforcement ratios
图 9 不同配筋率的试件失稳前优势峰频分布
Figure 9. Dominant peak frequency distribution ratio before unstable propagation for specimens with different reinforcement ratios
表 1 试件配筋参数
Table 1. Reinforcement parameters of specimens
试件 纵向钢筋配置 配筋率/% RC01 2ϕ6.5 0.277 RC02 1ϕ10 0.327 RC03 2ϕ8 0.419 RC04 2ϕ10 0.654 
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表 2 不同配筋率试件失稳前峰频数量统计
Table 2. Number of peak frequencies before unstable propagation for specimens with different reinforcement ratios
荷载水平/% RC01 RC02 RC03 RC04 85 14 28 54 74 90 32 53 57 100 95 48 41 55 88 100 119 62 140 103
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[1] 董立恒. 混凝土I-II复合型断裂过程区及裂缝扩展过程数值模拟[D]. 大连: 大连理工大学, 2016. DONG Liheng. Mixed mode Ⅰ-Ⅱ fracture process zone of concrete and numerical simulation of crack propagation process[D]. Dalian: Dalian University of Technology, 2016. (in Chinese) [2] 纪洪广. 混凝土材料声发射性能研究与应用[M]. 北京: 煤炭工业出版社, 2004: 18-23. JI Hongguang. Research and application of acoustic emission properties for concrete materials[M]. Beijing: Coal Industry Press, 2004: 18-23. (in Chinese) [3] JENQ Y S, SHAH S P. Mixed-mode fracture of concrete[J]. International Journal of Fracture, 1988, 38(2): 123-142. [4] 董伟. 混凝土Ⅰ-Ⅱ复合型裂缝起裂准则的试验研究与裂缝扩展过程的数值模拟[D]. 大连: 大连理工大学, 2008. DONG Wei. Experimental investigation on initial cracking criterion and numerical simulation of crack propagation for I-II mixed mode in concrete[D]. Dalian: Dalian University of Technology, 2008. (in Chinese) [5] 胡宗棋. 含V型切口混凝土的复合型断裂研究[D]. 南昌: 华东交通大学, 2018. HU Zongqi. Study on composite fracture of concrete with V notch[D]. Nanchang: East China Jiaotong University, 2018. (in Chinese) [6] 韩金启, 王向东, 王玉琳. 混凝土Ⅰ-Ⅱ复合型裂缝断裂损伤区分析[J]. 大连交通大学学报,2015,36(6):62-66. (HAN Jinqi, WANG Xiangdong, WANG Yulin. Analysis of damage and fracture zone of I-II concrete mixed mode cracks[J]. Journal of Dalian Jiaotong University, 2015, 36(6): 62-66. (in Chinese) doi: 10.11953/j.issn.1673-9590.2015.06.062 [7] JACOBSEN J S, POULSEN P N, OLESEN J F. Characterization of mixed mode crack opening in concrete[J]. Materials and Structures, 2012, 45(1/2): 107-122. [8] GARCÍA-ÁLVAREZ V O, GETTU R, CAROL I. Analysis of mixed-mode fracture in concrete using interface elements and a cohesive crack model[J]. Sadhana, 2012, 37(1): 187-205. doi: 10.1007/s12046-012-0076-2 [9] AYATOLLAHI M R, MOGHADDAM M R, BERTO F. A generalized strain energy density criterion for mixed mode fracture analysis in brittle and quasi-brittle materials[J]. Theoretical and Applied Fracture Mechanics, 2015, 79: 70-76. doi: 10.1016/j.tafmec.2015.09.004 [10] CARMONA J R, RUIZ G, DEL VISO J R. Mixed-mode crack propagation through reinforced concrete[J]. Engineering Fracture Mechanics, 2007, 74(17): 2788-2809. doi: 10.1016/j.engfracmech.2007.01.004 [11] HU S W, LU J, XIAO F P. Evaluation of concrete fracture procedure based on acoustic emission parameters[J]. Construction and Building Materials, 2013, 47: 1249-1256. doi: 10.1016/j.conbuildmat.2013.06.034 [12] SALIBA J, MATALLAH M, LOUKILI A, et al. Experimental and numerical analysis of crack evolution in concrete through acoustic emission technique and mesoscale modelling[J]. Engineering Fracture Mechanics, 2016, 167: 123-137. doi: 10.1016/j.engfracmech.2016.03.044 [13] GOSZCZYŃSKA B. Analysis of the process of crack initiation and evolution in concrete with acoustic emission testing[J]. Archives of Civil and Mechanical Engineering, 2014, 14(1): 134-143. doi: 10.1016/j.acme.2013.06.002 [14] SAGAR R V, PRASAD B K R. An experimental study on acoustic emission energy as a quantitative measure of size independent specific fracture energy of concrete beams[J]. Construction and Building Materials, 2011, 25(5): 2349-2357. doi: 10.1016/j.conbuildmat.2010.11.033 [15] 张璇子, 陈红迁, 王志勇. 混凝土材料三点弯曲破坏的声发射特性[J]. 实验力学,2010,25(4):457-462. (ZHANG Xuanzi, CHEN Hongqian, WANG Zhiyong. On the acoustic emission characteristics of concrete fracture subjected to three-point-bending[J]. Journal of Experimental Mechanics, 2010, 25(4): 457-462. (in Chinese) [16] 胡钰泉, 胡少伟, 黄逸群. 带裂缝混凝土轴拉力学性能及Kaiser效应试验研究[J]. 水利水运工程学报,2019(3):67-75. (HU Yuquan, HU Shaowei, HUANG Yiqun. Experimental studies on mechanical properties and Kaiser effect of concrete with cracks under axial tensile stress[J]. Hydro-Science and Engineering, 2019(3): 67-75. (in Chinese) [17] ZAKI A, CHAI H K, BEHNIA A, et al. Monitoring fracture of steel corroded reinforced concrete members under flexure by acoustic emission technique[J]. Construction and Building Materials, 2017, 136: 609-618. doi: 10.1016/j.conbuildmat.2016.11.079 [18] 范向前, 胡少伟, 陆俊. 不同配筋率对钢筋混凝土三点弯曲梁断裂韧度的影响[J]. 水电能源科学,2013,31(12):117-121. (FAN Xiangqian, HU Shaowei, LU Jun. Effects of various reinforcement ratio on fracture toughness of reinforced concrete for three-points bending beams[J]. Water Resources and Power, 2013, 31(12): 117-121. (in Chinese) [19] 巩妮娜, 胡少伟, 范向前, 等. 混凝土Ⅰ-Ⅱ复合型断裂过程声发射特征研究[J]. 防灾减灾工程学报,2019,39(1):171-179. (GONG Ni’na, HU Shaowei, FAN Xiangqian, et al. Study on acoustic emission characteristics during I-II mixed mode fracture process in concrete[J]. Journal of Disaster Prevention and Mitigation Engineering, 2019, 39(1): 171-179. (in Chinese) [20] 纪洪广, 刘翔宇, 曾鹏, 等. 高强混凝土单轴压缩声发射频率特征试验研究[J]. 应用声学,2016,35(3):248-254. (JI Hongguang, LIU Xiangyu, ZENG Peng, et al. Experimental studies of frequency characteristics of the acoustic emission of the high-strength concrete under the uniaxial compression process[J]. Journal of Applied Acoustics, 2016, 35(3): 248-254. (in Chinese) -
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