Contoh soal Geometri Jalan

 Contoh soal  Geometri Jalan

Kelas   : B

Matkul : Geometri Jalan

 

Tugas 2

 

Diketahui       : V = 60 km/jam

                          R = 264 m

                          Delta = 30⁰

                          e normal = 2 %

                          Jalan belok ke kiri

Ditanya           : Rencanakan lengkung horizontal dengan tipe SCS ?

Jawab :

Interpolasi e

e = 0,0696

e = 6,96 %

Ls = 50 m

Өs =  =  = 5,43⁰

Өc = ꞵ - 2. Өs = 30 – 2.5,43 = 19,14⁰

Lc = ( + 2πR) + 2Ls = ( x 2π.264) + 2.50 = 88,15 + 100 = 188,15 m

Yc =  =  = 1,58 m

Xc = Ls -  = 50 -  = 49,95 m

P   = Yc – R(1 - cos Өs) = 1,58 – 264(1 – cos 5,43⁰) = 0,39

K  = Xc – R(sin Өs) = 49,95 – 264(sin 5,43⁰) = 24,98

Es = (R + P).secꞵ - R = (264 + 0,39). sec – 264 = 9,72

Ts = (R + P).tanꞵ + K = (264 + 0,39). tan + 24,98 = 95.82

 

 

Gambar Lengkung Spiral-Circle-Spiral

Gambar Diagram Super Elevasi Spiral-Circle-Spiral