起降与滑行荷载作用下道面-地层结构动力特性与损伤分析

Analysis of Dynamic Characteristics and Damage of Pavement Stratum Structure under Take off and Landing and Sliding Loads

依托成都双流国际机场滑行道工程,通过理论分析、公式推导及数值模拟等综合研究手段,确定飞机动荷载系数并推导出飞机单轮荷载计算公式,研究飞机在滑行道面运动过程中,起降与滑行荷载作用下机场道面-地层结构的动力特性与损伤。研究结果表明,滑行荷载对道面-地层结构的影响最大,滑行荷载作用下,道面-地层结构在频率为7 Hz附近时振动加速度达到最大值。从能量角度看,飞机荷载从道面传递至地层时,高频段的加速度能量在地层中的耗散比中低频段更快;道面-地层结构的1/3倍频程曲线最大值均出现在9.45 Hz频段,随着地层深度增加,地层结构的VAL值呈现衰减趋势,且衰减率不断增大。从损伤量值角度看,滑行荷载对道面结构的损伤总体较小。

Based on the taxiway project of Chengdu Shuangliu International Airport,the dynamic load coefficient of aircraft is determined and the calculation formula of single wheel load of aircraft is derived through comprehensive research methods such as theoretical analysis,formula derivation and numerical simulation,.The dynamic characteristics and damage of the airport pavement-stratum structure under the action of take-off and landing and taxiing loads during the movement of the aircraft on the taxiway surface are studied.The results show that sliding load has the greatest influence on the pavement stratum structure.Under sliding load,the vibration acceleration of the pavement stratum structure reaches the maximum when the frequency is about 7 Hz.From the perspective of energy,when the aircraft load is transferred from the pavement to the stratum,the acceleration energy dissipation in the high frequency band is faster than that in the middle and low frequency band.The maximum value of the one-third octave curve of pavement stratum structure appears in the frequency band of 9.45 Hz.With the increase of stratum depth,the VAL value of stratum structure tends to attenuate and the attenuation rate keeps increasing.From the perspective of damage value,the damage to the pavement structure caused by the sliding load is generally small.