公路勘测设计65课件.ppt

1、云南交通职业技术学院云南交通职业技术学院第三节第三节 缓和曲线缓和曲线 缓和曲线是设置在直线与圆曲线之间缓和曲线是设置在直线与圆曲线之间或大圆曲线与小圆曲线之间，由较大圆曲线或大圆曲线与小圆曲线之间，由较大圆曲线向较小圆曲线过渡的线形，是道路平面线形向较小圆曲线过渡的线形，是道路平面线形要素之一。要素之一。缓和曲线的主要特征是曲率均匀变化。缓和曲线的主要特征是曲率均匀变化。缓和曲线的定义缓和曲线的定义一、设置缓和曲线的目的和条件一、设置缓和曲线的目的和条件目的目的条件条件二、缓和曲线的性质二、缓和曲线的性质Cl 汽车匀速从直线进入圆曲线或（相反）其行驶汽车匀速从直线进入圆曲线或（相反）其行驶轨

2、迹的弧和半径成反比轨迹的弧和半径成反比 YXXO2AlRLsA 三、缓和曲线最小长度三、缓和曲线最小长度缓和曲线最小长度应满足：缓和曲线最小长度应满足：（1）使汽车平顺地由直线段过渡到到圆曲线段，）使汽车平顺地由直线段过渡到到圆曲线段，并对离心力的增长有一定的限制；并对离心力的增长有一定的限制；（2）驾驶员操纵方向盘所需的必要时间以利驾）驾驶员操纵方向盘所需的必要时间以利驾驶员顺适地操纵放向盘；驶员顺适地操纵放向盘；（3）满足道路设置超高与加宽过渡的要求。）满足道路设置超高与加宽过渡的要求。三、缓和曲线最小长度三、缓和曲线最小长度RVLs3035.02.1minVLsipbLSRLs21803

3、0 290 S30 290 S1 1Ls SLs S2 2 三、缓和曲线最小长度三、缓和曲线最小长度注：四级公路为超高、加宽缓和段注：四级公路为超高、加宽缓和段 四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数LsRlx22RLs2YXdPZHydxdlZYRxhh22540LsRllx3373606LsRlRLsly22540LsRllx3373606LsRlRLslyLsl 四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数RLsp242232402RLsLsqE0HYQZYHR=R+pR+pRRR=0ZHOJDHZh四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数2336011

4、32RLsLsTd2312631RLsLsTkhkQYhChhZHOdHYRX2390secRLsLsXChhh2)1(3 Ls3h四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数1802RLs1 1、单交点、单交点RLsp242232402RLsLsqE0HYQZYHR=R+pR+pRRR=0ZHOJDHZh四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数RpREH2sec)(HHHLTD 2LsRLH2180)2(qpRTH2tan)(RL180)2(0E0HYQZYHR=R+pR+pRRR=0ZHOJDHZh四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数ABaBAsinsi

5、n2 2、双交点、双交点BAbTTAbacE（YZ）RR河流B（JDb）A（JDa）T2T1a2a1D（ZY）OC（JD）TT图2-9 虚交单曲线 ABbABsinsinaTTB四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数2tan11RT 2 2、双交点、双交点2tan2tan2121TTR2tan2tan1121RRTTaT1T2T2图2-10 双交点曲线B(JDb)A(JDa)C(JD)FRROE(YZ)D(ZY)T1a2a1a2a12tan22RT 四、直角坐标与缓和曲线常数四、直角坐标与缓和曲线常数2 2、双交点、双交点aT1T2T2图2-10 双交点曲线B(JDb)A(JDa

6、)C(JD)FRROE(YZ)D(ZY)T1a2a1a2a1022242422SBALRtgtgABR五、缓和曲线省略的条件五、缓和曲线省略的条件五、缓和曲线省略的条件五、缓和曲线省略的条件五、缓和曲线省略的条件五、缓和曲线省略的条件谢谢！谢谢！MbJ8G4D1A-w*t!qYnVjSgPdLaI6F3C0y)v&s#pXmUiRfNcK9H5E2B+x(u$rZoWkThQeMbJ7G4D1z-w*t!qYmVjSgOdLaI6F3B0y)v%s#pXlUiQfNcK8H5E2A+x*u$rZnWkThPeMbJ7G4C1z-w&t!qYmVjRgOdL9I6F3B0y(v%s#oXlUiQ

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