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时间:2020-03-25
《汽车荷载作用下沥青路面公路动力响应数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第9卷第5期铁道科学与工程学报VOI.9NO.52012年10月JOURNALOFRAILWAYSClENCEANDENGINEERINGoct.2012汽车荷载作用下沥青路面公路动力响应数值模拟赵健,李振存,郭昕,王健(1.长沙理工大学交通科学研究院,湖南长沙410076;2.长沙理工大学交通运输工程学院,湖南长沙410076)摘要:运用ANSYS软件建立沥青路面与路基三维动力分析模型,采用双频率正弦波动荷栽模拟车辆动荷载,分析了三轴六轮组的东风重型货车在车速为72km/h时,满载和超载80%两种工况下路面和路基动力响应。计算结果表明:轮距中心左右各2in的范围内,面层结构横向应力
2、分布呈双峰状,轮迹处最大,然后向两边衰减;且随着深度增加,应力逐渐由压应力转化为拉应力,拉应力在面层下56Clq0.处达到最大;竖向动应力在路基内随着深度的增加逐渐减小,沿横向在路基表面呈马鞍状分布,且随着深度增加逐渐变为单峰分布;满载及超载80%时动荷载影响深度分别为2.2m和2.6in,影响宽度分别为4m和6.5in。关键词:汽车荷载;沥青路面公路;动力响应;数值模拟;影响范围中图分类号:U416.1文献标志码:A文章编号:1672—7029(2012)05—0083—07Numericalanalysisofbitumen——surfacehighwaydynamicrespo
3、nseundervehicleIoadsZHAOJian,LIZhen—cun,GUOXin,WANGJian(1.TransportationResearchInstitute,ChangshaUniversityofScienceandTechnology,Changsha410076,China;2.SchoolofTrafficandTransportationEngineering,ChangshaUniversityofScienceandTechnology,Changsha410076,China)Abstract:3ddynamicanalysismodelsofa
4、sphaltpavementandsubgradewereestablishedbyfiniteelementsoft—wareANSYS.Vehicledynamicloadsweresimulatedbydualfrequencysinewave.Thedynamicresponseot。pavementandsubgradewereanalyzedundertheactionofDongfongtruckwhenthespeedis72km/hwithfullloadandoverload80%.Thecalculatedresultsshowthatwithinthescop
5、eofeach2maroundtreadcenter,transversestressdistributionofthesurfacelayerstructureisbimodalshape.Themaximumappearsinplaceofwheeltrackandthenattenuatestowardbothsides.Withtheincreaseofthedepth,thestresschangesgraduallyfromthecompressivestressintotensilestress,andthemaximumtensilestressappears56em
6、undersurfacelayer.Verticaldynamicstressdecreasesgraduallywiththeincreaseofthedepthinthesubgrade.Verticaldynamicstressshowssaddle—shapeddistributionalongthehorizontalsurfaceofthesubgrade,andwithincreaseofthedepth,itincreasinglybecomesunimodaldistribution.Theinfluencedepthofthedynamicloadswiththe
7、actionoffullloadandoverloadof80%are2.2mand2.6m.thewidthare4mand6.5m.Keywords:vehicleloads;bitumen—surfacehighway;dynamicresponse;numericalsimulation;influencescope长期以来,我国刚性及柔性路面的设计均是以载,然后计算沥青混凝土路面路表回弹弯沉值、沥静力学理论为基础,即将车辆移动荷载简化为静荷青混凝
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