水泥混凝土跑道边缘区域力学响应

Mechanical Responses of Edge of Rigid Airport Pavement Under Aircraft Loadings

为模拟飞机滑跑时道面的力学响应,实现飞机滑行状态下对跑道承载力的检测,在考虑机场跑道混凝土面板间接缝传荷效应条件下,建立了跑道三维有限元模型。将飞机动荷载作用于跑道,通过计算涵盖实际场道结构的不同结构层强度组合的跑道测试区竖向位移,建立了测试区位移峰值与跑道各层强度的数学模型,揭示了水泥混凝土跑道边缘区域的结构力学响应。计算结果表明:测试区竖向位移峰值与面层厚度近似成线性关系,与面层弹性模量近似成对数关系,与地基回弹模量近似成指数关系,而基层回弹模量与垫层回弹模量对测试区竖向位移影响不显著。

A three-dimensional finite element model which consists of thirty full-scale slabs is established for analyzing the mechanical responses of cement concrete airport pavement under aircraft dynamic loads and detecting its capacity under aircraft taxiing.And the joint loading-transfer effect between slabs is considered in the model.The mathematical models between displacement peaks in test area and elasticity modulus of each pavement structure layer are built by calculating plenty of vertical displacements which range over different modulus combinations according to actual runway structure.The results show that the peak value of vertical displacement has linear relationship with surface thickness,logarithmic relationship with pavement elastic modulus and exponential relationship with the resilient modulus of foundation.The resilient moduli of base course and bed course influence little on vertical displacements.