Correct Answer - Option 2 : Unequal with short leg connected
Concept-
A plate girder is a built up I-beam section, used to carry heavy loads which cannot be carried economically by rolled I-sections. It is made by riveting or welding the steel plates in I-beam shape.
Flanges or flange plates are horizontal elements of plate girder which are provided at the top and bottom and they are separated by the web. The main purpose of flange plates is to resist the bending moment acting on the girder.
The top flange resists the bending moment by developing compression and the bottom flange resists the tensile force. They should be provided with a required width and thickness to offer good resistance against bending moment.
In case of bolted plate girder, the angle section that is used should be Unequal with short leg connected so that the moment carrying capacity of the section will be more as the plastic section modulus will be more in this case.
