机场水泥混凝土道面接缝传荷能力分析  

3-D finite element analysis of the load transfer efficiency of joints of airport rigid pavement

作　　者：周正峰[1] 凌建明[2] 袁捷[2] 

机构地区：[1]西南交通大学,四川成都610031 [2]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《土木工程学报》2009年第2期112-118,共7页China Civil Engineering Journal

基　　金：国家自然科学基金委员会与中国民用航空总局联合资助项目 (60776818)

摘　　要：基于ABAQUS有限元软件,按照"贡献面积"刚度分配原则,通过在相邻混凝土板侧面的对应结点设置弹簧单元,建立并验证了考虑接缝传荷能力的机场刚性道面三维有限元模型。利用该模型,分析了单轮荷载作用下荷载大小和道面结构参数对混凝土板在接缝附近的力学响应和接缝传荷能力的影响,以及不同构型起落架的多轮荷载作用对道面力学响应和接缝传荷能力的影响。结果表明:接缝传荷能力与荷载大小无关,只与道面结构自身有关;增大混凝土板厚度,板边应力和接缝传荷能力均有明显减小;增大基层厚度、基层与面层的层间黏结性能和土基强度,板边应力和接缝传荷能力仅略有减小;增大接缝刚度,可以提高接缝的传荷能力,并改善接缝附近混凝土板的受力状况。在多轮荷载作用下,轮距越小,板边应力和接缝传荷能力越大;除了三轴三轮起落架的应力折减系数略小于0.25外,其他构型起落架都大于0.25,而以荷载表征的接缝传荷系数随着起落架轴数的增多而减小。Based on the ABAQUS software, a 3-D finite element model to analyze the structural response and load transfer efficiency （LTE） of the jointed rigid airport pavement was established by distributing the stiffness to the nodes along the joint using the concept of contributing areas. Behavior of the joint was evaluated in detail with respect to load levels, structural parameters, as well as under multiple wheel loads. The results indicate that LTE is independent of load levels. Slab thickness and joint stiffness have more significant effect on LTE than base layer thickness, contact condition between slab and base, and subgrade strength. Furthermore, under multiple wheel loads, the stress response of the loaded side of the joint is almost the same as under single load, while on the unloaded side of the joint it is affected by the interaction of multiple wheel loads. Stress transfer for various landing gears approaches or exceeds 0.25, and shear load transfer decreases with an increase in axes of landing gear.

关 键 词：机场 水泥混凝土道面 接缝 传荷能力 三维有限元 

分 类 号：U416.216[交通运输工程—道路与铁道工程]