主跨285m的法国新德黑内桥（The New Terenez Bridge，见图1）建成后将成为世界上最长的曲线斜拉桥。该桥将替代连接布列塔尼大陆与法国西北部克罗宗半岛的旧桥（悬索桥）。该桥平面线形设计为曲线是为了增大与旧桥引桥的平面距离，以...主跨285m的法国新德黑内桥（The New Terenez Bridge，见图1）建成后将成为世界上最长的曲线斜拉桥。该桥将替代连接布列塔尼大陆与法国西北部克罗宗半岛的旧桥（悬索桥）。该桥平面线形设计为曲线是为了增大与旧桥引桥的平面距离，以提高行车安全性。展开更多
金田高架桥（Kanada Viaduct）位于日本首都圈中央联络线上，连接海老名 IC（高速公路出入口）和圈央厚木 IC ，是一座上、下行线分离的多跨连续梁桥（见图1）。上行线为 PRC（预应力钢筋混凝土）33跨连续板梁桥，桥长1019．0 m ，下行...金田高架桥（Kanada Viaduct）位于日本首都圈中央联络线上，连接海老名 IC（高速公路出入口）和圈央厚木 IC ，是一座上、下行线分离的多跨连续梁桥（见图1）。上行线为 PRC（预应力钢筋混凝土）33跨连续板梁桥，桥长1019．0 m ，下行线为 PRC 34跨连续板梁桥，桥长1041．7 m 。该桥架桥位置地势平坦，两端连接相模川大桥及246号国道跨线桥，为避开桥址区的公共设施、工厂及既有公路，平面线形设计为 S 形曲线，横向坡度为±8％。展开更多
Road horizontal alignment contains three elements: straight line,circular arc,and clothoid.In AutoCAD,clothoid can only be fitted by polyline or spline,and the graphics which are separated from the road data are indep...Road horizontal alignment contains three elements: straight line,circular arc,and clothoid.In AutoCAD,clothoid can only be fitted by polyline or spline,and the graphics which are separated from the road data are independent of each other.Therefore,it is necessary to develop a new curve for road horizontal alignment.Firstly,the differential approximation and series integration methods for clothoid were discussed.Secondly,the geometric formulae for road line which contain the three elements were derived as a whole.Then,the advantages and feasibility of customizing a road line class,which was derived from the curve base class,were analyzed based on ObjectARX(AutoCAD Runtime eXtension) techniques.Finally,the data structure and operations for the road line class were stressed.The experimental results show that the road line can integrate the road elements,graphics and data to implement the graphics-oriented design,which can be widely used in road alignment design.展开更多
文摘金田高架桥（Kanada Viaduct）位于日本首都圈中央联络线上，连接海老名 IC（高速公路出入口）和圈央厚木 IC ，是一座上、下行线分离的多跨连续梁桥（见图1）。上行线为 PRC（预应力钢筋混凝土）33跨连续板梁桥，桥长1019．0 m ，下行线为 PRC 34跨连续板梁桥，桥长1041．7 m 。该桥架桥位置地势平坦，两端连接相模川大桥及246号国道跨线桥，为避开桥址区的公共设施、工厂及既有公路，平面线形设计为 S 形曲线，横向坡度为±8％。
基金Project(51108049)supported by the National Natural Science Foundation of ChinaProject(kfj090207)supported by Open Fund of Key Laboratory of Road Structure and Material of Ministry of Transport(Changsha University of Science and Technology),China
文摘Road horizontal alignment contains three elements: straight line,circular arc,and clothoid.In AutoCAD,clothoid can only be fitted by polyline or spline,and the graphics which are separated from the road data are independent of each other.Therefore,it is necessary to develop a new curve for road horizontal alignment.Firstly,the differential approximation and series integration methods for clothoid were discussed.Secondly,the geometric formulae for road line which contain the three elements were derived as a whole.Then,the advantages and feasibility of customizing a road line class,which was derived from the curve base class,were analyzed based on ObjectARX(AutoCAD Runtime eXtension) techniques.Finally,the data structure and operations for the road line class were stressed.The experimental results show that the road line can integrate the road elements,graphics and data to implement the graphics-oriented design,which can be widely used in road alignment design.
