摘要
基于结构动力学基本理论,系统地分析了路面材料阻尼系数的求解方法,以及材料阻尼效应对路表动态弯沉的影响规律.结果表明:利用第1,第2主振型的固有频率计算阻尼系数的方法,能克服传统简化计算阻尼系数而带来的结果偏差;黏性阻尼系数几乎对路表弯沉时程变化没有影响;土基阻尼效应是影响路表动态弯沉时程变化的关键因素,而其它层材料的阻尼特征影响甚微.研究结果为进行路面结构动力学分析时,材料阻尼参数的计算以及合理取值提供了理论与实践依据.
Based on the basic theory of structural dynamics, the determination of damping coefficients of pavement materials and its influence on the dynamic deflection of asphalt pavement were studied. The results demonstrate that the damping coefficients determined from the natural fi＇equencies of the first and second principal vibration modes do not suffer from the error of the conventional calculation method. The viscous damping coefficient has little influence on the pavement deflection and can be neglected in the dynamic analysis of pavement structure. Compared with the other materials, the damping feature of the subgrade is a main factor affecting the pavement deflection. The analysis provides a reference for the calculation and determination of material damping coefficients in dynamic analysis of pavement structure.
出处
《力学与实践》
CSCD
北大核心
2008年第6期51-55,共5页
Mechanics in Engineering
基金
上海市科学技术委员会科研计划项目资助(062112062).
关键词
阻尼
结构动力学
沥青路面
动态弯沉
数值分析
damping, structure dynamics, asphalt pavement, dynamic deflection, numerical analysis
