深圳大学学报理工版

王威娜,周圣雄,秦煜,等.复合梁张开型反射开裂行为声发射特征及损伤表征[J].深圳大学学报理工版,2021,38(4):393-399.[doi:10.3724/SP.J.1249.2021.04393]
WANG Weina,ZHOU Shengxiong,QIN Yu,et al.Acoustic emission characteristics and damage characterization of opening-mode reflection cracking behavior of composite beams[J].Journal of Shenzhen University Science and Engineering,2021,38(4):393-399.[doi:10.3724/SP.J.1249.2021.04393]

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复合梁张开型反射开裂行为声发射特征及损伤表征

王威娜^1,2,周圣雄¹,秦煜^1,3,蔡盛辉¹

1)重庆交通大学土木工程学院,重庆 400074; 2)重庆交通大学交通土建工程材料国家地方联合工程实验室,重庆 400074; 3)中铁二院重庆勘察设计研究院有限责任公司,重庆400023

关键词：沥青混合料; 声发射; 张开型反射裂缝; 加铺; 损伤评估; 三点弯曲; 复合梁

Acoustic emission characteristics and damage characterization of opening-mode reflection cracking behavior of composite beams

WANG Weina^{1, 2}, ZHOU Shengxiong¹, QIN Yu^1,3, and CAI Shenghui¹

1)School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, P.R.China;2)National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, P.R.China;3)CREEC(Chongqing)Survey, Design and Research Co., Ltd., Chongqing 400023, P.R.China

Keywords：asphalt mixture; acoustic emission(AE); opening-mode reflective crack; overlay; damage assessment; three-point bending; composite beam

DOI: 10.3724/SP.J.1249.2021.04393

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为探究沥青加铺层张开型反射裂缝的发展过程,开展了水泥混凝土加铺沥青层的复合梁三点弯曲试验研究,采用声发射技术对复合梁的损伤过程进行动态监测,利用开源数字图像软件Ncorr获取损伤过程的水平向应变场,以荷载、声发射(acoustic emission, AE)振幅、AE振铃计数和AE能量研究复合梁的损伤过程.试验结果表明,AE技术对沥青加铺层内部微裂缝及宏观裂缝的发展均具有良好的识别效果.基于AE参数,可将张开型反射开裂过程划分为静寂期、上升期、发展期和残余期4个阶段.静寂期基本没有AE信号; 上升期和发展期损伤快速增长,表现为AE信号密集且活跃,与荷载曲线具有良好的一致性,呈现出单峰型特征; 残余期复合梁已临近破坏,损伤趋于平缓.张开型反射裂缝扩展过程先沿着接缝两侧,以多裂缝的形式发展,随后其中一条裂缝发展成主裂缝,并持续垂直向上扩展,次裂缝进入停滞状态.研究结果可为反射开裂行为分析提供参考.

In order to explore the cracking behavior of opening-mode reflective cracks in asphalt overlays, we carry out the three-point bending test of composite beams with cement overlay asphalt layer. We quantitatively evaluate the damage based on the acoustic emission(AE)characteristic parameters.Firstly, we dynamically monitor the damage process of composite beams using AE technique, then, analyze the horizontal strain of the damage process through open source digital imaging software Ncorr,and finally, study the damage process of the composite beam by AE amplitude, AE ringing counts and AE energy. The test results show that AE technology has a good recognition effect on the development of micro-cracks and macro-cracks in the asphalt overlay.According to the AE parameters, the opening-mode reflection cracking process can be divided into four stages: silent period, ascending period, development period and residual period. There is basically no AE signal in the silent period.In the ascending and developing periods, the damage increases rapidly, showing that the AE signal is dense and active, which is consistent with the load curve, showing a single-peak type characteristic.In the residual period, the composite beam is approaching failure.The damage tends to be gentle.Opening-mode reflective cracks firstly spread along both sides of the joint, in a multi-fracture development form, and then one of the cracks developes into a main crack and continues to extend vertically upward, and the secondary crack enters a stagnation state.We propose a method for characterizing damage evolution based on the amount of AE ringing counts damage of the opening-mode reflection cracking behaviorof composited beams. It can provide a reference for the analysis of reflection cracking behavior.

引言
1 试验设计与方法
2 基于声发射特征参数的损伤演化分析
3 结合二维数字图像技术的损伤分析
4 基于损伤量的损伤演化分析
5 结论

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