1.长沙理工大学 交通运输工程学院;2.长沙理工大学 道路灾变防治及交通安全教育部工程研究中心
U416
国家自然科学基金(52278437)；湖南省自然科学基金(2022JJ40479)；湖南省交通运输厅科技创新计划项目(202236)；长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(kfj210401)
1.LIU Zhao-hui;2.School of Traffic and Transportation Engineering, Changsha University of Science &3.Technology
The National Natural Science Foundation of China(52278437); The National Natural Science Foundation of Hunan(2022JJ40479); Hunan Provincial Department of Transportation Science and Technology Innovation Plan Project(202236);Project funded by Open Fund of Engineering Research Center of Road Disaster Prevention and Traffic Safety, Ministry of Education, Changsha University of Science and Technology(kfj210401)
为改善内置应变传感器与沥青混合料的变形协调性,采用高模量细集料沥青混合料AC-5和常规沥青面层混合料AC-13作为基体材料,成型试件并内置电阻式应变传感器,结合DIC(数字图像相关法)开展单轴压缩、单轴拉伸、四点弯曲逐级加载试验；建立经假设检验验证的有限元模型,分析应变计埋设深度、荷载大小和荷载类型等不同工况下,高模量过渡材料对变形协调性的影响。结果表明,在多种类型荷载作用下,相比AC-13沥青混合料,AC-5高模量沥青混合料中的传感器实测应变数据更加接近DIC实测数据,且测量误差更小、更稳定；试件在受压、受拉时会出现不同的测量偏差,高模量沥青混合料对偏差有一定改善；AC-5高模量沥青混合料在应变计埋深、荷载大小、荷载类型三种影响因素中表现出的与应变计协调变形性能相较AC-13沥青混合料均有不同程度的提高。
In order to improve the deformation coordination between the built-in strain sensors and asphalt mixtures, high-modulus fine aggregate asphalt mixture AC-5 and conventional asphalt surface mixture AC-13 are used as the base materials, and the specimens are molded with built-in resistive strain sensors, and uniaxial compression, uniaxial tension, and four-point bending step-by-step loading tests are carried out in conjunction with DIC (Digital Image Correlation); a finite-element model verified by hypothesis testing is established. The finite element model verified by hypothesis testing is established to analyze the influence of high modulus transition materials on deformation coordination under different working conditions such as strain gauge burial depth, load size and load type. The results show that under various types of loads, compared with AC-13 asphalt mixture, the measured strain data of the sensors in AC-5 high-modulus asphalt mixture is closer to the measured data of DIC, and the measurement error is smaller and more stable; the specimen will have different measurement deviations when subjected to compression and tension, and the high-modulus asphalt mixture has some improvement on the deviation; AC-5 high-modulus asphalt mixture has a certain degree of improvement on the deviation of the strain gage buried depth, load size, load size, and load type. AC-5 high modulus asphalt mixture in the strain gage depth, load size, load type of three influencing factors in the strain gage coordinated deformation performance compared to AC-13 asphalt mixture have different degrees of improvement.
