平曲线要素计算公式(给学生用的)

.18m423.18+60×0.05=426.18设计高程=426.18-0.90=425.28m桩号K5+100.00处:横距x2=(K5+120.00)-(K5+100.00)=20m竖距h2=x22/2R=202/2×2000=0.1m切线高程=427.68-(90-20)×0.04=424.88m设计高程=424.88-0.1=424.78m横距x2=(K5+100.00)-(K4+940.00)=160m竖距h2=x22/2R=1602/2×2000=6.4m切线高程=423.18+160×0.05=431.18m设计高程=431.18-6.40=424.78mBPD设计高程=427.68-E=425.65mBPD施工高=设计高程-地面高程=425.65-450.65=-25m,应为挖方。[例2]平原区某二级公路有一弯道,偏角α右=15°28′30″,半径R=600m,缓和曲线长度Ls=70m,JD=K2+536.48。试计算曲线主点里程桩号。1)曲线要素计算:2)主点里程桩号计算:以交点里程桩号为起算点:JD=K2+536.48ZH=JD–T=K2+536.48-116.565=K2+419.915HY=ZH+Ls=K2+419.915+70=K2+489.915QZ=ZH+L/2=K2+419.915+232.054/2=K2+535.942HZ=ZH+L=K2+419.915+232.054=K2+651.969YH=HZ–Ls=K2+651.97–70=K2+581.969JDK2+536.48-)T116.565ZHK2+419.915+)Ls?70HYK2+489.915+)L-2Ls92.054YHK2+581.969+)Ls70HZK2+651.969-)L/2232.054/2QZK2+535.942+)J/21.077/2JDK2+536.48