摘要
为研究组合结构试件的高温变形特性,分别采用2种沥青混合料制备总厚度相同、不同厚度组合的车辙板和圆柱形试件,进行车辙试验和单轴重复加载永久变形试验,分析组合试件的车辙变形行为和力学特性,讨论力学参数与车辙动稳定度和车辙变形的关系,并针对组合结构进行数值模拟分析,分析不同结构组合试件在荷载下的变形行为差异.研究结果表明,不同厚度组合的试件重复荷载变形特性存在较大的差异,在相同荷载次数下S(4/6)变形最小,即具有最好的抗永久变形性能,力学参数εp/Fn可以反映组合结构试件的高温变形性能.不同组合结构的最大剪应力及其出现的位置不同,S(4/6)试件的最大剪应力最小而且分布于高温性能较好的上面层,其抗永久变形能力最好.
In order to study the high-temperature performance of composite structure asphalt concrete specimens,plate and cylindrical double-layer specimens with two asphalt mixtures are prepared to conduct wheel tracking test and uniaxial repeated load permanent deformation test.The rut deformation behavior and mechanical characteristics are analyzed and the relationship between rut deformation and mechanical parameters is also discussed.In addition,according to numerical simulation analysis,the deformation mechanism of composite structures under the same loads was discussed.The results and analysis indicate that the deformation behaviors of the specimens with different structures are different significantly despite the same total thickness.Among those specimens,S（4/6）has the smallest deformation and corresponding mechanical parameter εp/Fn is also the smallest under the same load.The maximum shear stresses and their occurrence in different positions for different composite structures have discrepancies.The maximum shear stress of S（4/6）is smaller than other structures,which appears in the upper layer having better high temperature performance.This is the reason why the resistance to permanent deformation of S（4/6） is best among the three composite structures.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2010年第6期55-59,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金项目(51008031)
国家西部交通建设科技项目(200631881221)
中央高校基本科研业务费专项基金(CHD2009JC095)
关键词
沥青混合料
组合结构
永久变形
力学参数
asphalt concrete
composite structure
permanent deformation
mechanical parameter
