DESIGN OF STEEL STRUCTURE 2

The main advantage of steel member is that it

• has high strength
• is gas and water tight
• has long service life
• all of these

Gantry girders are designed to resist

• A. lateral load
• B. longitudinal loads
• C. lateral and longituinal loads
• D. lateral, longitudinal and vertical loads

Vertical stiffeners in plate girders are provided

• A. to increases bearing strength of web
• B. to prevent local buckling of the flange
• C. to prevent local buckling of the web
• D. none of these

Which of the following loads are not considered in the design of gantry girders?

• A.longitudinal loads
• B. gravity loads
• C. Lateral loads
• D. Wind loads

For gantry girders carrying electrically operated overhead travelling cranes, the lateral forces are increased by ____ for impact allowance.

• a) 10% of weight of crab and weight lifted on the crane
• b) 20% of weight of crab and weight lifted on the crane
• c) 25% of maximum static wheel load
• d) 50% of maximum static wheel load

For gantry girders carrying hand operated cranes, the vertical forces are increased by____ for impact allowance

• a) 10% of maximum static wheel load
• b) 25% of maximum static wheel load
• c) 10% of weight of crab and weight lifted on the crane
• d) 20% of weight of crab and weight lifted on the crane

The maximum wheel load is obtained when

• a) crane crab is farthest to gantry girder
• b) crane crab is closest to gantry girder
• c) crane crab is not attached
• d) crane crab is at mid span

The bending moment due to dead load of girder is maximum at

• a) one-third distance at span
• b) two-third distance at span
• c) end of span
• d) centre of span

What is the maximum vertical deflection allowed for a gantry girder where the cranes are manually operated?

• a) L/500
• b) L/700
• c) L/600
• d) L/800

The minimum recommended rise of trusses with Galvanised Iron sheets is

• a) 1 in 12
• b) 1 in 6
• c) 1 in 10
• d) 1 in 18