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时间:2020-04-23
《冲压荷载下旧水泥混凝土路面的变形及应力-论文.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4期公路交通科技V0l_29No.42012年4月JournalofHighwayandTransportationResearchandDevelopmentApr.2012doi:10.3969/j.issn.1002—0268.2012.04.002冲压荷载下旧水泥混凝土路面的变形及应力杨娥,刘剑(1.广州航海高等专科学校航务工程学院,广东广州510700;2.华南理工大学土木与交通学院,广东广州510640)摘要:为准确分析冲压荷载作用下旧水泥混凝土路面的变形和应力分布状况,通过建立合适的有限元模型来对其分析计
2、算,并以第一强度理论来判断旧路面板的破裂情况,总结了路面板在冲击压实情况下的破坏机理。通过该模型得出旧水泥路面板竖直方向和水平方向的变形和受力特点,即:路面板在冲压荷栽作用下发生纵、横双向弯曲变形,并以全断面的纵向弯曲变形为主,最大变形值位于路面板的两冲压轮之间的位置,路面板断面上竖向各点的沉降变形有微小变化,变形性态说明路面板将以弯曲形式发生破坏;路面板在轮压荷栽作用下,上面层受压应力,下面层受拉应力,拉压应力的分界点在路面板中心偏下的位置,上面层绝大部分区域3个方向均处于受压状态,纵向压应力几乎为横向压应力的2倍。关键词:道
3、路工程;旧水泥混凝土路面;有限元;变形;冲压荷载;应力分析中图分类号:U416.216文献标识码:A文章编号:1002—0268(2012)04—0007—07DeformationandStressofOldCementConcretePavementunderStampingLoadYANGE,LIUJian(1.SchoolofNavigationalEngineering,GuangzhouMaritimeCollege,GuangzhouGuangdong510700,China;2.SchoolofCivilEngi
4、neering&Transportation,SouthChinaUniversityofTechnology,GuangzhouGuangdong510640,China)Abstract:Foraccuratelyanalysingthedeformationandstressdistributionofoldcementconcretepavementunderstampingload,theappropriatefiniteelementmodelwasestablishedforanalysisandcalculati
5、on,thefirststrengththeorywasusedtodeterminetheruptureoftheoldpavementslab,andthefailuremechanismofpavementslabunderimpactcompactionwassummedup.Theresultindicatesthatthemodelcanbeusedtoobtainthedeformationandthemechanicalcharacteristicsoftheoldconcreteroadpanelsinvert
6、icalandhorizontaldirections,i.e.,longitudinalandhorizontalbendingoccurredinroadpanelunderstampingload,mainlythelongitudinalbendingdeformationofthewholesection,themaximumdeformationoccuredatthepositionofthepavementslabbetweentwostampingwheels,thesettlementdeformations
7、ubtlechangedintheverticaldirectionofcross-sectionofpavementslab,andthedeformationbehaviorindicatedthatthepavementslabwillbebendingdestructed.Underthewheelpressureloads,theupperlayerborecompressivestressandthelowerlayerboretensilestress,thecut-ofpointoftensionandcompr
8、essionstresseswasatthelowerpositioninthepavementslab,mostpartoftheupperlayerwasincompressionstateinthreedirections,andlongitudinalc
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