Home | ENGINEERING | Highways Design: Horizontal curve

Civil - Highway Engineering - Geometric Design Of Highways

Highways Design: Horizontal curve

   Posted On :  23.07.2016 09:53 pm

The presence of horizontal curve imparts centrifugal force which is reactive force acting outward on a vehicle negotiating it.

Horizontal curve

 

The presence of horizontal curve imparts centrifugal force which is reactive force acting outward on a vehicle negotiating it. Centrifugal force depends on speed and radius of the horizontal curve and is counteracted to a certain extent by transverse friction between the tyre and pavement surface. On a curved road, this force tends to cause the vehicle to overrun or to slide outward from the centre of road curvature. For proper design of the curve, an understanding of the forces acting on a vehicle taking a horizontal curve is necessary. Various forces acting on the vehicle are illustrated in the figure.

 

They are the centrifugal force (P) acting outward, weight of the vehicle (W) acting downward, and the reaction of the ground on the wheels (RA and RB ). The centrifugal force and the weight is assumed to be from the centre of gravity which is at h units above the ground. Let the wheel base be

assumed as b units. The centrifugal force P in kg=m2 is given by


where W is the weight of the vehicle in kg, v is the speed of the vehicle in m=sec, g is the acceleration due to gravity in m=sec2 and R is the radius of the curve in m.

 

The centrifugal force has two effects: A tendency to overturn the vehicle about the outer wheels and a tendency for transverse skidding. Taking moments of the forces with respect to the outer wheel

 

when the vehicle is just

 

The second tendency of the vehicle is for transverse skidding. i.e. When the centrifugal force P is greater than the maximum possible transverse skid resistance due to friction between the pavement surface and tyre. The transverse skid resistance (F) is given by:

 

where FA and FB is the fractional force at tyre A and B, RA and RB is the reaction at tyre A and B, f is the lateral coefficient of friction and W is the weight of the vehicle. This is counteracted by the centrifugal force (P), and equating:

 

Tags : Civil - Highway Engineering - Geometric Design Of Highways
Last 30 days 42 views
Related words :

What is Highways Design: Horizontal curve Define Highways Design: Horizontal curve Definition of Highways Design: Horizontal curve where how meaning of Highways Design: Horizontal curve lecturing notes for Highways Design: Horizontal curve lecture notes question and answer for Highways Design: Horizontal curve answer Highways Design: Horizontal curve study material Highways Design: Horizontal curve assignment Highways Design: Horizontal curve reference description of Highways Design: Horizontal curve explanation of Highways Design: Horizontal curve brief detail of Highways Design: Horizontal curve easy explanation solution Highways Design: Horizontal curve wiki Highways Design: Horizontal curve wikipedia how why is who were when is when did where did Highways Design: Horizontal curve list of Highways Design: Horizontal curve school assignment college assignment Highways Design: Horizontal curve college notes school notes kids with diagram or figure or image difference between Highways Design: Horizontal curve www.readorrefer.in - Read Or Refer

​TOP MENU

OTHER SUGEST TOPIC

Recent New Topics :