Steel part 3 1-25 slides set 1

A plate girder is primarily used for

• Very short spans

• Carrying heavy loads over long spans

• Decorative purposes

• Column design

Plate girders are commonly fabricated by

• Rolling

• Casting

• Welding two flanges and a web plate

• Machining a solid steel block

Plate girders are preferred when span exceeds

• 10 m

• 15 m

• 20 m

• 25 m

Maximum span limit for plate girders with welded construction is approximately

• 20 m

• 50 m

• 75 m

• 100 m

A cross-section of plate girder is subjected to

• Only axial force

• Torsion

• Shear and bending moment

• Pure compression

Function of top and bottom flanges in a plate girder is to

• Resist shear

• Resist buckling

• Carry axial compressive and tensile forces

• Support loads directly

Function of web plate in a plate girder is to resist

• Axial force

• Torsion

• Shear force

• Local buckling

To reduce axial flange force for a given bending moment, the web depth should be

• Small

• Medium

• As large as possible

• Equal to flange width

The web in a steel plate girder refers to the deep central (a)   plate.

Flanges are (a)   elements provided at the top and bottom of a plate girder.