新一代大型飞机荷载作用下沥青道面多轮叠加效应研究

Multiple Wheel Gear Load Interaction Effect of New Generation Large Aircraft on Airfield Asphalt Pavement

为了研究复杂起落架飞机A380荷载作用下沥青道面多轮叠加效应,建立了机场沥青道面结构三维有限元模型,分析土基材料和粒料材料非线性对半刚性基层和柔性基层沥青道面结构力学响应的影响。研究结果表明:随着轮组数的增加,轮载在道面结构内产生的响应不断增加;随着轮组数的增加,材料非线性效应对道面结构力学响应的影响逐步减弱,多轮荷载叠加效应表现明显。半刚性基层沥青道面,不同轮载组合作用时,土基非线性对道面结构的力学响应影响与线弹性的差异在5%以内;粒料非线性与土基和粒料皆为非线性时,两者之间的力学响应差异不到5%;柔性基层沥青道面,土基非线性对道面表面弯沉影响较大外,对于其他力学响应指标影响差异在5%以内;粒料非线性与粒料和土基皆为非线性两者之间的差异在5%以内,建议分析过程同时考虑土基和粒料材料的非线性特性。

In order to discuss the superposition effect on airport asphalt pavement under multiple wheel gear load interaction of aircraft A380, the 3D finite element model for airport asphalt pavement is created. The material nonlinear effects of subgrade and granular materials on the mechanical response of semi-rigid base and flexible base asphalt pavement structures are analyzed. The result shows that （1） as the wheel number increasing, the mechanical response in the pavement structures increases, the effect of material nonlinearity on pavement structural mechanical response weakens, and the superposition under multiple wheel gear load interaction becomes apparent; （2） for semi-rigid base airport asphalt pavement, under the different wheel gear load combinations, the differences between the nonlinear effect and linear elastic effect of subgrade on the mechanical response of the pavement structure is no more than 5% ; （ 3 ） the differences of mechanical response between nonlinear granular base and both nonlinear granular base and subgrade is no more than 5%; （3） for flexible base airport asphalt pavement, pavement structure between nonlinear and linear elastic the difference of other mechanical response of the of subgrade is no more than 5% except for the larger nonlinear effect of subgrade on the pavement deflection; （4） the difference of mechanical response between nonlinear of granular base and both nonlinear granular base and subgrade is no more than 5%. The recommended analysis is considering both the nonlinear characteristics of the sugbrade and granular materials.