Maximum And Minimum SuperElevation As Per I.R.C - Civil Engineering

Tuesday, 26 March 2019

Maximum And Minimum SuperElevation As Per I.R.C

Maximum And Minimum SuperElevation As Per I.R.C

When a vehicle is moving  on curved path it is subject to an outward force known as centrifugal force. In order to counteract the effect of centrifugal force, the outer edge of the pavement is raised with respect to the inner edge. 
This transverse inclination provided to the pavement surface is known as superelevation.
Maximum And Minimum SuperElevation As Per I.R.C
Maximum And Minimum SuperElevation As Per I.R.C
Superelevation generally denoted by 'e' and expressed as the ratio of the height of the outer edge will respect to the inner edge to the horizontal width.
Superelevation (e) = BC/AC = tanθ

Maximum Superelevation

As per IRC, the maximum superelevation in plain and rolling terrain and in snow bound area is 1 in 15 or 4° or 7 %. On hill roads not bound by snow, a maximum superelevation upto 10% has been recommended by IRC.

Minimum Superelevation

The road surface should have a minimum camber to drain off rain water. If the calculated superelevation is equal to or less than the camber of the road surface, then the minimum superelevation  to be provided on horizontal curve may be limited to the camber of the surface.
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