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  DESIGN OF BRIDGES

DESIGN OF BRIDGES



Classification, Investigation and Planning, Choice of type, I.R.C. Specifications for Road Bridges, Standard live, loads, other forces acting on bridges, General Design considerations - Bearings, substructures and footing for bridges.

A bridge is a structure providing passage over an obstacle such as valley, road, railway line, canal, river etc, without closing the way beneath. The required passage may be for road, railway, canal, pipe line, cycle track (or) Pedestrian. Bridges may be of RC or steel construction. The beams are supported on intermediates piers and end abutments. In India bridges for roads are designed as per the recommendation of the India Road Congress. Rail bridges are designed on the recommendation of specifications of the Indian Railway standard code of Practice.

The objectives for these guidelines are to:
Describe processes or stages of work to be followed for a bridge site investigation. Describe information required to design bridge foundations.Indicate standards of skill, workmanship and reporting, which are to be applied.

STAGES OF INVESTIGATION
Field Reconnaissance Survey For most bridge investigations access and environmental constraints have major influences on cost. It is therefore necessary for a field reconnaissance survey to be conducted as the first stage of a geotechnical investigation. This may be undertaken by MRWA or by a consultant specifically engaged for this survey.


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