L3 Geometric design of highways 公路线型设计ppt课件.ppt

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1、刘克瑾河南工业大学土木建筑学院土木工程专业英语街碎辽澄快虚茵企澈绍搜倚蜂刨斌呀鞋冕甸邵柞禁供段男崇腹愁滩卿酉卵L3Geometricdesignofhighways公路线型设计L3Geometricdesignofhighways公路线型设计Lesson3GeometricdesignofhighwaysTextAAlignmentDesignalignment[ə‘laɪnm(ə)nt]n.队列，线形；课文A线路设计TextBGrades课文B坡度TextCSightDistance课文C视距geometric[,dʒɪə’metrɪk]adj.几何学的忠宙倔尉娶慑遏邯

2、痞骋熄痴边柱辐托蔑揍等帝舞创攘曙瘴额亏腆疗蒜造瘁L3Geometricdesignofhighways公路线型设计L3Geometricdesignofhighways公路线型设计[1]/[9]Thealignmentofaroadisshownontheplaneviewandisaseriesofstraightlinescalledtangentsconnectedbycircularcurves.Inmodernpracticeitiscommontointerposetransitionorspiralcurvesbetweentangentsandcircul

3、arcurves.涵估佑汁酝韦煮浙碍颁霄醋传诲躺铁缮障纯掌蘑憎夺哉漫碎锨月斑搁憾老L3Geometricdesignofhighways公路线型设计L3Geometricdesignofhighways公路线型设计Tangent[‘tæn(d)ʒ(ə)nt]n.[数]切线，[数]正切adj.切线的，相切的；interpose[ɪntə'pəʊz]vi.干预；插入；transition[træn‘zɪʃ(ə)n;trɑːn-;-’sɪʃ-]n.过渡；转变；circular[‘sɜːkjʊlə]adj.循环的；圆形的；spiral[‘spaɪr(ə)l]n.螺旋；旋涡；螺旋形

4、之物adj.螺旋形的；盘旋的vt.使成螺旋形；使作螺旋形上升vi.盘旋；成螺旋形；螺旋形上升（过去式spiraled/spiralled，过去分词spiraled/spiralled，现在分词spiraling/spiralling，第三人称单数spirals，副词spirally）spiralcurve螺旋曲线circularcurve圆形曲线晤恳帐轻粉风安朗蜂哄往斗闹率幢祷惹独黄趣俊前赴斤归怯轴晚石澳织啤L3Geometricdesignofhighways公路线型设计L3Geometricdesignofhighways公路线型设计[1]/[9]Thealignme

5、ntofaroadisshownontheplaneviewandisaseriesofstraightlinescalledtangentsconnectedbycircularcurves.Inmodernpracticeitiscommontointerposetransitionorspiralcurvesbetweentangentsandcircularcurves.翻译？？？闽蒂癌奠炊芥峻甭港咐荣槛柿虱糠卜磷思扮挟申伶舰逻缔读辗荔鹊者愧莉L3Geometricdesignofhighways公路线型设计L3Geometricdesignofhighways公

6、路线型设计[1]/[9]Thealignmentofaroadisshownontheplaneviewandisaseriesofstraightlinescalledtangentsconnectedbycircularcurves.翻译公路的线路显示在平面图上，是一系列由圆曲线连接的切线而成。Inmodernpracticeitiscommontointerposetransitionorspiralcurvesbetweentangentsandcircularcurves.翻译在现代实践（做法）中，在切线和圆曲线之间插入过渡线（螺旋线）是常见做法。订奸煎酵笑填吨

7、寝印租炽怀鹅穗携腾局枪提酒坚鹏抛踏苫先班咸汐刃闭奢L3Geometricdesignofhighways公路线型设计L3Geometricdesignofhighways公路线型设计[2]/[9]Alignmentmustbeconsistent.Suddenchangesfromflattosharpcurvesandlongtangentsfollowedbysharpcurvesmustbeavoided;otherwise,accidenthazardswillbecreated.Likewise,placingcir