考虑飞机制动力的机场沥青道面力学响应分析

Mechanical Response Analysis of Asphalt Concrete Pavement Considering Braking Force of Aircraft

针对飞机在降落制动过程中所产生的制动力对道面结构产生显著影响,并借助ABAQUS三维有限元软件,建立了柔性道面结构和半刚性道面结构有限元模型,分析在常用的民用飞机和新一代大型飞机荷载作用下,考虑水平制动力作用时对道面结构产生的力学响应.同时分析了以B777-300ER、A380-800为代表的新一代大型飞机,在考虑不同的水平制动力、土基模量、面-基层接触状况条件下时对道面力学响应的影响.计算结果表明:考虑制动力后,面层最大拉应力出现在道面表面;水平制动力超过0.5倍单轮荷载后,使得面层内部的拉应力急剧增大;层间的不良接触对半刚性道面结构影响较大,当面-基层的接触系数大于0.5后,对面层内部的最大剪应力和面层底部的拉应力影响不显著.

Some significant impact produced in asphalt concrete pavement by braking force when aircraft landing. Three-dimensional finite element model for semi-rigid pavement and flexible pavement structure was created with ABAQUS software. Finite element model was adopted to analyze the mechanical response of the civil aircraft and new generation large aircraft with a consideration of the braking force. Meanwhile, an analysis was made of the influence of different braking force, different subgrade modulus and different interface condition between surface and base for B777-300ER and A380-800. The results show that the maximum tensile stress of surface appears at the top ofpavement by considering the braking force. The tensile stress in the surface increases significant when the braking force exceeds 0.5 times of the single wheel load. The interface condition between surface and base affects the semi-rigid pavement more. When the contact coefficient between surface and base exceeds 0.5, influence for the maximum shear stress in the surface and the tensile stress at the bottom of surface is not significant.