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时间:2020-03-25
《沥青混合料拉压疲劳损伤试验.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29卷第3期2012年3月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.29No.3Mar.2012doi:10.3969/j.issn.1002—0268.2012.03.001沥青混合料拉压疲劳损伤试验钱国平,刘宏富,郑健龙,蒋丽君(长沙理工大学交通运输工程学院,湖南长沙410004)摘要:为研究沥青路面结构实际处于拉压应力作用下的疲劳损伤特性,针对沥青混合料AC一13开展了连续式交变正弦波形加载的小梁拉压疲劳试验。依据损伤力学基本理论,采用唯象学方法分析了沥青混合料的拉压疲
2、劳损伤特性。介绍了拉压疲劳试验方法及影响因素,根据疲劳试验结果得到了拉压疲劳方程;基于弹性模量定义的损伤变量,建立了拉压疲劳损伤模型,拟合疲劳试验结果确定了损伤参数,获得了考虑应力水平的拉压疲劳损伤演化方程。研究结果表明:疲劳损伤参数Ot、口随应力水平增大而增大,且近似呈线性关系;拉压疲劳损伤演化大致呈3阶段变化规律,即损伤萌生、损伤稳定增长和损伤失稳破坏阶段;应力水平越大的损伤演化曲线越靠下,随寿命比变化疲劳损伤演化速度越缓和。关键词:道路工程;损伤演化方程;拉压疲劳试验;沥青混合料;非线性疲劳损伤中图分类号:U416.217文献标识码:A文章编号:1002—0
3、268(2012)03—0001—06ExperimentofTension—compressionFatigueandDamageforAsphaltMixtureQIANGuoping,LIUHongfu,ZHENGJianlong,JIANGLijun(SchoolofTrafficandTransportationEngineering,ChangshaUniversityofScienceandTechnology,ChangshaHunan410004,China)Abstract:Inordertounderstandthefatiguedamage
4、characteristicsoftheactualstructureofasphaltpavementundertensionandcompressionstress,thetension-compressionfatiguetestofbeamundercontinuoussinewaveahematingloadingforAC一13wasconducted.Basedonthebasictheoryofdamagemechanics,thetension—compressionfatiguedamagecharacteristicsofasphaltmix
5、tureswerestudiedusingphenomenology.Thetension—compressionfatiguetestmethodandinfluencingfactorswereintroduced,andthetension-compressionfatigueequationwasestablishedbyfatiguetestresults.Basedonthedamagevariabledefinedbyelasticmodulus,thetension—compressionfatiguedamagemodelwasestablish
6、ed.Thedamageparametersweredeterminedbyfittingthefatiguetestdata,andthetension—compressionfatiguedamageevolutionequationregardingtothestresslevelwasbuilt.Theresultsshowthat(1)fatiguedamageparameters仅and届increasedwithstresslevel,andtherelationshipbetweenthedamageparametersandthestressle
7、velwaslinear;(2)tension—compressionfatiguedamageevolutionwasroughlythree-stagevariation,i.e.,damageinitiation,damagestablegrowthanddamageunstablefailure;(3)thegreaterthenominalstresslevel,thelowerthecurveofdamageevolutioncurve,andthemoremoderatethefatiguedamageevolutionspeedvaryingwit
8、hlife
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