Vertical curves

Июль 26, 2022

Содержание

2. Shape: Parabolic not circle Types:- Crest Sag
4. Design: Curve length (L). Crest –(L): depends on sight distance. Sag- (L): depends on : head
5. S.S.D: (S) Crest
6. P.S.D (S): Crest
7. Sag
8. A vertical curve of G1=+3%, G2=+1%, on a two-lane two way road. Find the curve length?
9. a) As the road is two lane two way road, then P.S.D is control. A=|G2-G1| =
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Слайд 2

Shape: Parabolic not circle
Types:-
Crest
Sag

Слайд 3

Слайд 4

Design: Curve length (L).
Crest –(L): depends on sight distance.
Sag- (L): depends

on :
head light distance
Drainage
Driver comfort

Слайд 5

S.S.D: (S)
Crest

Слайд 6

P.S.D (S):
Crest

Слайд 7

Sag

Слайд 8

A vertical curve of G1=+3%, G2=+1%, on a two-lane two way

road. Find the curve length? Assume S.S.D=220ft, P.S.D=730ft, H.L.D=500ft.
b) If the road is widened and divided by island, Find the curve length?

Example

Слайд 9

a) As the road is two lane two way road, then

P.S.D is control.
A=|G2-G1|
= |+1-+3|=2
Assume P.S.DL=2(730²)/864=1233.6ft ok.

Solution