Transition Curves.pptx

8/19/2019 Transition Curves.pptx

1/22

Transition Curves


2/22

Transition Curve

Introduced between a straight line and a

between two curves.

It facilitates the gradual change from str

to a curve or from one curve to another.

What happens as soon as a vehicle ente


3/22

It experiences acentrifugal force


4/22

There are chances forthe vehicle to derail,

overturn or slip

ow can we avo


5/22


6/22


7/22


8/22


9/22


10/22

r = Radius of the curved banked roadm = Mass of the moving vehicle


11/22

(et v be the maximum speed of the


12/22

)ssuming the force of friction to benegligible when the vehicle is moving at ahigh speed* the forces acting are+

• Weight = mg

• Normal reaction exerted

by road surface on the

vehicle, N• ori!ontal component of

N = N"in

• #ertical component of

N = NCos


13/22

The vehicle has no vertical motion$"o,

N "in

directed to%ards the centre o

the curve provides the necessarycentripetal force$


14/22

&ividing second e'uation by (rst %eget,

The superelevation )independethe mass o

vehicle


15/22

v is the maximum safety speed %ith %hvehicle can be safely driven along a

banked road$ This is also independent o

the mass of the vehicle$


16/22


17/22


18/22


19/22


20/22


21/22


22/22

Transition Curves.pptx

Documents