Mencari superelevasi Penghitungan lengkung peralihan Ls Perhitungan besaran tikungan Perhitungan pelebaran perkerasan

commit to user 58

3.2.3 Tikungan PI

3 Data tikungan : ∆ 3 = 17 o 43’48” Rren = 300 m

1. Mencari superelevasi

775 , 4 300 39 , 1432 39 , 1432 = = = Rren D 1 , 9 091 , 822 , 6 775 , 4 1 , 2 822 , 6 775 , 4 1 , . 2 2 2 max max 2 max 2 max = = × × + × − = × × + × − = D D e D D e e tjd ... 1 , 091 , max ok e e tjd =

2. Penghitungan lengkung peralihan Ls

1. Berdasarkan waktu tempuh maximum 3 detik untuk melintasi lengkung peralihan, maka panjang lengkung : m t Vr Ls 667 , 66 3 6 , 3 80 6 , 3 = × = × = 2. Berdasarkan rumus modifikasi Short : m c e Vr c R Vr Ls tjd ren 238 , 44 4 , 091 , 80 727 , 2 4 , 300 80 022 , 727 , 2 022 , 3 3 = × − × × = × − × × = commit to user 59 3. Berdasarkan tingkat pencapaian perubahan kelandaian : m Vr e e Ls normal 111 , 71 80 025 , 6 , 3 02 , 1 , Re 6 , 3 max = × × − = × × − = 4. Berdasarkan rumus bina marga m m e en w Ls tjd 696 , 77 200 091 , 02 , 2 5 , 3 2 2 = × + × × = × + × = Dipakai nilai Ls yang terbesar yaitu 77,696m

3. Perhitungan besaran tikungan

12 25 7 300 2 14 , 3 2 360 696 , 77 2 2 360 = × × × × = × × = Rr Ls Qs π 24 53 2 12 25 7 2 48 1743 17 2 3 = × − = × − ∆ = ∆ Qs c m Rr c Lc 143 , 15 180 300 14 , 3 24 53 2 180 = × × = × × ∆ = π Syarat tikungan S-S ... 20 143 , 15 ok Lc = commit to user 60 12 52 8 48 43 17 2 1 3 2 1 = = ∆ = Qs m Ls 839 , 92 90 300 14 , 3 12 52 8 = × × = 696 , 77 839 , 92 min Ls Ls m Rr Ls Ls Xs 636 , 20 300 40 839 , 92 839 , 92 40 2 3 2 3 = ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × × = ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × × = m Rr Ls Ys 788 , 4 300 6 839 , 92 6 2 2 = × = × = m Qs Rr Rr Ls P 201 , 1 12 52 8 cos 1 300 300 6 839 , 92 cos 1 6 2 2 = − − × = − − × = m Qs Rr Rr Ls Ls K 359 , 46 12 52 8 sin 300 300 40 839 , 92 839 , 92 sin 40 2 3 2 3 = × − × − = × − × − = m K P Rr Ts 364 , 93 359 , 46 48 43 17 tan 201 , 1 300 tan 2 1 3 2 1 = + × + = + ∆ × + = commit to user 61 m Rr P Rr Es 846 , 4 300 48 43 17 cos 201 , 1 300 cos 2 1 3 2 1 = − ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + = − ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ∆ + = 839 , 92 364 , 93 Ls Ts Tikungan S-S bisa digunakan

4. Perhitungan pelebaran perkerasan

m P Rr Rr b b 696 , 2 6 , 7 300 300 6 , 2 2 2 2 2 = − − + = − − + = m Rr A P A Rr Td 0605 , 300 1 , 2 6 , 7 2 1 , 2 300 2 2 2 = − + × + = − + + = m Rr Vr z 485 , 300 80 105 , 105 , = × = × = m z Td n c b n B 538 , 7 485 , 0605 , 1 2 8 , 696 , 2 2 1 = + − + + = + − + + = m W B E tambahan lebar E 538 , 5 , 3 2 538 , 7 = × − = − = = BW maka pada tikungan PI 2 diperlukan pelebaran perkerasan 0,538 m commit to user 62

5. Perhitungan kebebasan samping