Assignment III Topic Plate Girder

1. a) What is a Plate girder? Explain the structural importance of plate girder. b) Is plate girder suitable in bridges? Justify your answer.

2. a) Explain the concept behind plate girder with neat sketch and label the components. b) Where do you use the plate girder, give two examples? c) What are the bearing stiffeners? Give BIS specifications.

3. Design a welded plate girder for a simply supported bridge deck beam with clear span of 20m, subjected to the following :Dead load including self weight =20 kN/mImposed load =10 kN/mTwo moving loads = 150 kN each spaced 2m apart.Assume that the top compression flange of the plate girder is restrained laterally and prevented from rotation. Use mild steel with fy =250 MPa. Design plate girder.

( Last date for submission 27/01/15 )