基于CT扫描的钢桥面沥青铺装在抗剪钢筋约束下的层间剪切破坏分析  

Analysis on Interfacial Shearing Failure of Asphalt Pavement on Bar-reinforced Steel Deck Bridge Based on X-ray Tomography

作　　者：周欣 叶奋[1] ZHOU Xin;YE Fen(Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海市201804

出　　处：《公路》2024年第5期101-105,共5页Highway

摘　　要：为了探究钢桥面沥青铺装在抗剪钢筋约束下的层间剪切破坏特征,利用CT扫描得到剪切破坏前后的切片图像,运用数字图像处理软件Avizo对切片进行分析识别、三维重建,得到试件破坏前后内部各层面孔隙率及空隙分形维数的分布规律,从宏观和微观两个角度对试件剪切破坏的特征展开分析。研究结果表明,试件剪切破坏多发生在其初始空隙分布较密集处,空隙越大处的破坏越严重;剪切破坏后分形维数增大,分形维数分布与空隙率分布的趋势一致,说明剪切破坏前后过程是分形的。最后对裂缝的发展规律进行了总结,并分析了抗剪钢筋在其中发挥的作用。To explore the characteristics of interfacial shearing failure of asphalt pavement on barreinforced steel deck bridge,CT scanning is utilized to obtain cross-sectional images before and after shear failure.Digital image processing software Avizo is used to analyze and identify the slices,and reconstruction is made in 3D.This enables the determination of the distribution patterns of porosity and void fractal dimensions at different internal layers before and after specimen failure.The analysis of shear failure characteristics is conducted from both macroscopic and microscopic perspectives.The research findings indicate that shear failure in the specimen primarily occurs in regions with initially dense void distribution,and the severity of failure increases with larger voids.After shear failure,the fractal dimension increases,and its distribution correlates with the trend of porosity distribution,indicating a fractal process during shear failure.Furthermore,the development pattern of cracks is concluded,and the role of shear reinforcement in this process is analyzed.

关 键 词：钢桥面铺装 抗剪钢筋 X—ray CT扫描 数字图像处理 空隙率 分形维数 裂缝发展 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]