Courbon Method

The distribution of live load among the longitudinal girder can be estimated by COURBON’S METHOD

Cross section-A-A

culve rt

A culvert is a structure that allows water to flow under a road, railroad, trail, or similar obstruction from one side to the other side. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material.

1.Pipe culvert

2.Arch culvert

3.Box culvert

4.Steel girder

5.Rcc slab girder

Example of R.C. Slab culvert Design

Given data Width of bridge: 12m No footpath provided M25 Fe415 Clear span =5m Height of vent =3.0m Wearing course thickness =56mm asphalt concret

Design of deck slab (i)Preliminary dimensions: (ii)Slab thickness assumed 550mm (iii)Using 20mm dia bar & clear cover 50 mm

Dead loads

Weight  per m^2 of Slab

= thickness x density of concrete = 0.550 x 25 =13.75 KN

Wearing course per m^2 of slab =2.0 KN/m^2 Total dead load = 15.75 KN/M^2

Bending moment due to dead load =57.40875 KNm

Bending moment due to IRC Class AA wheeled vehicle