飞机滑行荷载对机场道面的随机振动效应分析

摘要

为了保障机场跑道的安全和使用性能,掌握飞机荷载作用于机场道面的机理和机场跑道的损伤失效模式.将机场道面结构视为弹性层状地基上的半无限板,采用振动理论,建立飞机-道面结构的耦合振动分析模型,对飞机滑行荷载所产生的振动作用力进行了计算,并对道面-基础结构在飞机滑行荷载作用下的工况进行了随机振动响应分析.分析结果表明飞机滑行振动荷载中高频作用力更容易引起道面结构的振动,随着频率的增大,振动能量也在不断增加,道面板弯沉值显示出高频振动为主的特性;并且道面结构在飞机-道面耦合作用荷载下产生的弯拉应力在低频附近出现峰值,随着频率的增大,其弯拉应力不再增加,道面结构的弯拉应力主要反映出低频振动特性,道面板弯拉应力出现极限值时,道面板部分出现开裂,开裂部分退出工作状态,其弯拉应力对于高频振动力的响应也随之减小.%The safety performance and usage of airport runway is related to the operating reliability of the aircraft and indirectly affect passenger's life safety.In order to master the condition of the airport pavement in use, the in-fluence detail factors must be considered during evaluation of airport runway pavement.On the basis of the pave-ment surface roughness by which caused aircraft vibration load was calculated.Random vibration characteristics of aircraft wheel load as the main factors, the airport pavement and the foundation are researched using random vibra-tion analysis method.By use of reconstruction of pavement roughness, the airport-pavement-foundation coupling vi-bration analysis model is established.The conclusion of the airport pavement analysis is that aircraft wheel random vibration force considering the effects of pavement surface roughness, middle or high frequency of it were more like-ly to lead to the vibration of the pavement structure.With the increase of frequency, vibration energy is also in-creasing; the runway pavement deflection value shows the characteristics with the high frequency vibration.The air-port-pavement coupling reaction force caused by pavement roughness is impact the flexural stress of the pavement structure near the low frequency part of it and the stress peak value appears at the same time.With the increase of frequency, the flexural stress is no longer increasing, the vibration of flexural tensile stress of pavement structure is mainly reflected the low frequency vibration characteristics.