混凝土路面接缝填缝料振动特性分析  

Vibrating Characteristics of Joint Sealant on Concrete Pavements

作　　者：周玉民[1] 谈至明[1] 李立寒[1] 

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201804

出　　处：《同济大学学报（自然科学版）》2012年第4期564-568,共5页Journal of Tongji University:Natural Science

基　　金：交通部西部交通科技建设项目(200731822301-4;200731822301-9)

摘　　要：采用1/4车-地基梁耦合动力学模型,分析了车辆速度和悬挂系上部质量、路面板厚度、接缝宽度、接缝剪切刚度、地基模量、地基阻尼系数和地基弱化指数等因素对接缝填缝料剪切应变、剪切应变率和其基频的影响规律.研究发现,以上各因素变化时,若地基阻尼系数较小,接缝填缝料剪切应变、剪切应变率随车辆位置变化呈现出波动衰减;若地基阻尼系数较大,则波动性消失.通常,剪切应变幅值在0.003～0.050之间变化,剪切应变率幅值在5～25s-1范围内,而其基频在5～100Hz之间.合理增加接缝宽度、提高接缝剪切刚度以及地基阻尼可有效降低填缝料剪切应变(率)幅值,从而减少接缝填缝料的失黏脱落破坏.研究结果可用于混凝土路面接缝填缝料力学性能评价和选材.Based on one-quarter vehicle-foundation beam interaction model, an analysis was made of the influences of factors, such as vehicle moving speed, mass above suspension system, pavement thickness, joint width, joint shearing stiffness, foundation modulus, foundation damping as well as foundation weakening index etc, on the dynamic shearing strains, strain rates and corresponding base frequencies. The study indicates when the foundation damping coefficient @ is small, the dynamic shearing strains and strain rates versus position x change in a fluctuate manner; whereas C1 is large enough, the fluctuation disappears. In general, the amplitudes of the dynamic shearing strains and strain rates are 0. 00340.05 and 5-25 （1/s） respectively, and corresponding base frequencies are 5 - 100 Hz, however, to reasonably openthe ioint width and increase the joint shearing stiffness as well as the foundation damping will be effective to lower the amplitudes of the dynamic shearing strains and strain rates, thus to reduce the risk of joint sealants damage. The resultant can be used for evaluation and selection of joint sealants for concrete pavements.

关 键 词：道路工程 混凝土路面 接缝填缝料 剪切应变 剪切应变率 基频 

分 类 号：U416.216[交通运输工程—道路与铁道工程]