考虑温度荷载的机场沥青道面复杂应力状态研究及性能评估

飞机在跑道上进行低速滑行转弯时,对道面同时作用竖向力与水平推力,同时温度也是影响机场沥青道面结构特性的主要因素之一。在此道面区域有竖向力、水平力和温度共同作用,从而加重了沥青道面的损坏并影响其运行安全。针对此问题,利用有限元软件ABAQUS建立机场沥青道面结构的温度场分析模型及温度与复杂荷载耦合分析模型,分析东北和华北地区不同气候条件下道面结构内部温度场的变化规律。华北、东北地区气候条件下,随着道面结构深度的增加,温度变化由剧烈趋于平缓,较之跑道表面其下每层最高温度不断延后;进而开展跑道转弯区和直线区复杂应力与温度耦合作用下沥青道面结构内部应力状态及变形规律分析。分析表明,在转弯区和直线区道面中面层底部剪应力大于上面层底部及下面层底部,面层竖向应力随深度衰减;随着荷载作用次数的增加,竖向变形量与剪切强度前期增加较快,尤其是在道面出现中等损坏之前增加最快,中等损坏后直到严重损坏两者增加均变缓。进一步,设计模型试验模拟沥青道面在复杂应力与温度耦合作用下的受力状态,获得道面结构剪切强度及其变形规律,与上述数值分析结果相一致。在上述数值分析和试验研究基础上,提出基于道面结构应力和变形的道面性能评估量化指标。

Research of Airport Asphalt Pavement Complex Stress State and Performance Evaluation Considering Temperature Load

When the aircraftSis taxiing on the pavementSturningSarea at low-speed, vertical forceSandShorizontal force will be exerted on theSpavement surfaceSat the same time.SThe temperatureSis also one of the main factors thatSaffect the structure characteristicsSof theSairport asphalt pavement.SBecause of the joint interaction of verticalSforce,Shorizontal force andStemperature in theSpavement,Stherefore, theSasphaltSpavementSdamageSwill be aggravated and operationSsafety will be affected, too.SAiming at this problem,Sthe analysisSmodels of temperature field and complex loadScoupling with temperature in airport asphalt pavement structure are foundedSin this paper which are based on ABAQUS software.SThe change rules of internal temperature fieldSof pavementSstructure under differentSclimate conditions ofSnortheast and north China are analyzed.SAlong with the increase ofSthe depth ofSpavementSstructure, the temperature changesSfrom violentStoSgentle,Sand theShighestStemperatureSof each layer under theSpavementSsurface delays;SAnd then, the analysis of deformation rules and stressSstate inside the