摘要
为研究传感器与沥青路面结构的协同工作性能,揭示传感器的感知效能及与混合料协同工作的性能演化规律,通过对融合内置传感器的沥青混合料试件,开展多重模式下的力学响应试验,分析不同加载模式和环境工况下的应变响应规律特征;采用ABAQUS软件,建立融合内置传感器的梁试件有限元模型,通过数值模拟与计算,并结合四点弯曲疲劳试验,对内置传感器与沥青混合料协同工作下的交互影响行为和耐久性进行分析。研究结果表明:在逐级加载和动载作用下,传感器表现出良好的感知时效性;实测应变响应受混合料黏弹性质影响存在明显的滞后效应,加载频率f愈大,滞后效应产生的不利影响愈明显;当信息采集频率f′为加载频率f的120倍时,数据采集效果最佳;应变传感器在温度变化、水-热耦合及不同速率等工况下能保持稳定的应变感知功能,实测应变响应曲线符合沥青路面结构的力学行为特征;与传感器法兰相接触的混合料和传感器自身测力杆处存在明显的应力集中现象,导致梁试件发生疲劳开裂而降低混合料的疲劳寿命;荷载反复作用下,裂缝的形成和拓展及传感器与基体材料发生滑移,造成实测应变难以反映混合料的真实形变,且感知功能呈现协同工作、感知失准和感知失效3阶段特征。
To study the cooperative performance of the sensor and the asphalt pavement structure,reveal the sensor's perceived efficiency and the evolution of the performance of the sensor's cooperative work with the mixture.Through the fusion of the asphalt mixture specimens with built-in sensors,the mechanical response test under multiple modes is carried out,and the characteristics of the strain response law under different loading modes and environmental conditions are analyzed.By using ABAQUS software,a finite element model of beam specimens with built-in sensors is established.Combing with numerical simulation and four-point bending fatigue test,the interactive influence behavior and durability under the built-in strain sensor works with asphalt mixture are explored.The results show that the sensor exhibits a good sense of timeliness under progressive loading and dynamic loading.Because of the influence of the viscoelasticity of the mixture,the strain response has obvious hysteresis.The greater the loading frequency f,the more obvious the adverse effects of hysteresis.When the information collection frequency f′is 120times the loading frequency f,the data collection effect is the best.The strain sensor can maintain a stable strain sensing function under working conditions such as temperature changes,water-heat coupling,and different speeds.And the measured strain response curve accords with the mechanical behavior characteristics of the asphalt pavement structure.There is obvious stress concentration in the mixture in contact with the sensor flange and the sensor's force measuring rod,which leads to fatigue cracking of the beam specimen and reduces the fatigue life of the mixture.Under repeated loads,the formation and expansion of cracks,and the slippage of the sensor and the matrix material,which make the measured strain difficult to reflect the true deformation of the mixture.And the sensing function presents three-stage characteristics of cooperative work,sensing inaccuracy,and sensing failure.
作者
刘朝晖
李文博
柳力
黄优
傅顺发
朱国虎
LIU Zhao-hui;LI Wen-bo;LIU Li;HUANG You;FU Shun-fa;ZHU Guo-hu(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China;National Engineering Laboratory of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha 410114,Hunan,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2023年第4期1-14,共14页
China Journal of Highway and Transport
基金
国家重点研发计划项目(2018YFB1600200)
湖南省交通运输厅科技进步与创新计划项目(202105)
湖南省研究生科研创新项目(CX20200825)
关键词
道路工程
沥青路面
力学响应试验
应变传感器
协同工作
服役性能
road engineering
asphalt pavement
mechanical response tests
Strain sensor
cooperative work
service performance
