适应大型飞机的沥青道面结构有限元模型

Finite element model of flexible airport pavement structure for large aircraft

借助ABAQUS通用有限元软件,建立了3层道面结构有限元模型,分析了模型的几何尺寸、边界条件、层间接触条件、单元类型、网格的划分对大型飞机荷载作用下道面结构力学响应的影响,提出了适应大型飞机的机场沥青道面结构有限元模型参数,并用实测力学响应数据对模型的有效性进行了验证。研究结果表明:在大型飞机全起落架荷载作用下,有限元模型几何尺寸宜为30m×30m×10m,层间完全连续选用tie连接;单元类型宜采用C3D8R,荷载区域的单元大小控制在不大于0.05m×0.05m;模型底部所有位移全部约束,模型四周约束对应水平方向的位移。实测数据验证结果表明有限元模型有效。

The finite element model of three-layer pavement structure was set up by using general finite element software ABAQUS.The influences of model geometry size,boundary conditions,contact conditions among layers,element types,and grid divisions on the mechanical responses of pavement structure were analyzed under large aircraft load.The parameters of flexible airport pavement structure＇s finite element model were put forward to adapt the characteristic of large aircraft load,and the effectiveness of the model was verified by using the measured mechanical response data.Study result indicates that considering the whole landing gear load of large aircraft,the geometry size of finite element model is appropriately 30 m×30 m×10 m,and the tie is chosen for completely continuous interaction among layers.C3D8R is used as an optimal element type,and the element size of load region could be controlled not to exceed 0.05 m×0.05 m.All the displacements are constrained at the bottom of the model,horizontal displacement is corresponded with the model constraint around,and the finite element model is effective verified by measured data.7 tabs,6 figs,14 refs.