Superelevasi

1. Ferry R., Ir., MT. (412153067)
TS Unjani
SUPERELEVASI
1) Superelevasi adalah suatu kemiringan
melintang di tikungan yang berfungsi
mengimbangi gaya sentrifugal yang
diterima kendaraan pada saat berjalan
melalui tikungan pada kecepatan VR.
2) Nilai superelevasi maksimum ditetapkan
4% – 10 %.

2. Ferry R., Ir., MT. (412153067)
TS Unjani

3. Ferry R., Ir., MT. (412153067)
TS Unjani
GAYA SENTRIFUGAL DI TIKUNGAN
• Dengan adanya lintasan yg berbentuk lingkaran
(Rc), maka kendaraan yg melintas akan
mendapatkan gaya sentrifugal; arahnya keluar
lingkaran.
• Gaya sentrifugal ini akan diimbangi oleh
gesekan samping antara ban kendaraan dan
permukaan jalan (f) dan kemiringan melintang
permukaan jalan / superelevasi (e).
 fe
V
R


127
2
Hubungan R, V, e, dan f

4. Ferry R., Ir., MT. (412153067)
TS Unjani
R
R
V
g
W 2

 feg
V
R
gR
V
fe
gR
V
ffWfNF
R
V
g
W
FW





2
2
2
2
tancos
cossin



5. Ferry R., Ir., MT. (412153067)
TS Unjani
JARI-JARI TIKUNGAN
(1) Jari - jari tikungan minimum (Rmin) ditetapkan sebagai
berikut:
di mana :
Rmin = Jari jari tikungan minimum (m),
VR = Kecepatan Rencana (km/j),
emax = Superelevasi maksimum (%),
f max = Koefisien gesek maksimum
(2) Terdapat Tabel untuk menetapkan Rmin
 maxmax
2
min
127 fe
V
R R



6. Ferry R., Ir., MT. (412153067)
TS Unjani
Tabel Panjang Jari-jari Minimum
Faktor Gesekan Samping (f)
Harga f tergantung pada kecepatan rencana; dng memper-
timbangkan curah hujan di Indonesia, harga f diambil sbb:
V km/jam 120 100 80 60 50 ≤40
f 0.10 0.11 0.12 0.13 0.14 0.15
Sumber : TATA CARA PERENCANAAN GEOMETRIK JALAN ANTAR KOTA No. 038/TBM/1997
Sumber : TATA CARA PERENCANAAN GEOMETRIK JALAN ANTAR KOTA No. 038/TBM/1997

7. Ferry R., Ir., MT. (412153067)
TS Unjani
ASUMSI f untuk DESIGN
Sumber : a Policy on GEOMETRIC DESIGN on Highways and Streets 2011 (6th ed)

8. Ferry R., Ir., MT. (412153067)
TS Unjani
METODE DISTRIBUSI e dan f
Sumber : a Policy on GEOMETRIC DESIGN on Highways and Streets 2011 (6th ed)
• Method 1—Superelevation and side friction are
directly proportional to the inverse of the radius
(i.e., a straight-line relation exists between 1/R =
0 and 1/R = 1/Rmin).
• Method 2—Side friction is such that a vehicle
traveling at design speed has all lateral
acceleration sustained by side friction on curves
up to those designed for fmax. For sharper curves,
f remains equal to fmax and superelevation is then
used to sustain lateral acceleration until e reaches
emax. In this method, first f and then e are
increased in inverse proportion to the radius of
curvature.
• Method 3—Superelevation is such that a vehicle
traveling at the design speed has all lateral
acceleration sustained by superelevation on
curves up to those designed for emax. For sharper
curves, e remains at emax and side friction is then
used to sustain lateral acceleration until f reaches
fmax. In this method, fi rst e and then f are
increased in inverse proportion to the radius of
curvature.
• Method 4—This method is the same as Method
3, except that it is based on average running speed
instead of design speed.
• Method 5—Superelevation and side friction are
in a curvilinear relation with the inverse of the
radius of the curve, with values between those of
Methods 1 and 3.

9. Ferry R., Ir., MT. (412153067)
TS Unjani
AVERAGE RUNNING SPEED
Sumber : a Policy on GEOMETRIC DESIGN on Highways and Streets 2011 (6th ed)

10. Ferry R., Ir., MT. (412153067)
TS Unjani
METODE PENCAPAIAN SUPERELEVASI
TIKUNGAN S-C-S
Sumber : TATA CARA PERENCANAAN GEOMETRIK JALAN ANTAR KOTA No. 038/TBM/1997

11. Ferry R., Ir., MT. (412153067)
TS Unjani
TIKUNGAN FC
Sumber : TATA CARA PERENCANAAN GEOMETRIK JALAN ANTAR KOTA No. 038/TBM/1997
METODE PENCAPAIAN SUPERELEVASI