机场刚性道面接缝传荷能力的评价

Evaluation of Load Transfer Efficiency at Joints for Rigid Airport Pavement

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，建立了考虑接缝传荷能力的机场刚性道面3维有限元分析模型.以重型落锤式弯沉仪(HWD)弯沉测试为基础，针对不同地基强度上的典型道面结构，考虑基层对接缝传荷能力的影响，应用有限元模型，分析了HWD承载板、单轴双轮起落架、双轴双轮起落架和三轴双轮起落架等荷载形式作用在接缝一侧板边中部时道面结构的板边应力和挠度，建立了HWD承载板测试得到的挠度传荷系数与接缝刚度之间的相关关系，以及与不同荷载形式作用的应力折减系

Abstract:

Based on ABAQUS software,a comprehensive 3D finite element model to analyze the structrual response of jointed rigid airport pavement was established by distributing the stiffness to the nodes along the joint using the concept of contributing areas.Bending stress and deflection for typical pavement structure with varying subgrade strength and joint stiffness on edge loading case were calculated under various landing assemblies.Considering the effect of base course on the load transfer efficiency at joints,a new relationship between the deflection load transfer efficiency obtained from Heavy Weight Deflectometer(HWD) and joint stiffness is established,and relationships between the deflection load transfer efficiencies and the stress load transfer efficiencies subjected to various landing assemblies are established as well.The results provide an approach to evaluate load transfer efficiency at joints and analyze bending stress at slab edge.