大型军用飞机多轮荷载作用下水泥混凝土道面的结构响应

以伊尔-76为例,考虑大型军用运输机复杂起落架构型和多轮荷载的作用特点,基于“地基-道面结构-飞机轮载”的相互作用,并采用弹簧单元模拟道面板的接缝传荷,借助ABAQUS软件建立了足尺9块水泥混凝土道面板的三维有限元分析模型。应用该模型,计算了多轮荷载不同组合作用下水泥混凝土道面的应力和变形,揭示了道面结构的力学响应,即在多轮荷载作用下,道面结构的最大应力位于轮载作用位置的板底部;与8轮荷载组合相比,16轮荷载组合作用下道面结构的应力和变形较小;而且,道面板弹性模量、基层回弹模量和地基反应模量对板底弯拉应力影响显著。

Mechanical responses of rigid airport pavement to multiple-gear military aircraft loadings

Based on the"subgrade-pavement-aircraft loading"interaction system and using the ABAQUS software,a 3-D finite element model is established for analyzing the mechanical responses of cement concrete airport pavement to multiple-gear military aircraft loadings.It consists of nine full-scale slabs with joint loading-transfer effect.Choosing IL-76 as the aircraft load,the mechanical responses of pavement to different groupings,8 wheels and 16 wheels,of aircraft multiple-gear loadings are analyzed.It is shown that the maximum tensile stress in the pavement occurs at the bottom of the slab,corresponding to the positions of wheels for both wheels groups,that the tensile stress and the deformation of the pavement under two 8-wheeled gears are smaller than that under one 8-wheeled gear,and that the elasticity modulus of the slab,the resilience modulus of the base and the reaction modulus of the subgrade all have significant effects on the mechanical responses of the pavement.