Question

Difference between surge load and drag load

Answer 1

Answer:

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Answer 2

Explanation:

The surge load and drag loads differences are as follows:

1. Surge load: also called as lateral loads.

• Sudden stopping of the crab and the load when transversing the crab girder.
• Crab transferring weights across the shop floor.
• The lateral load is assumed to act in the plane of center of gravity of the upper flange. Now this lateral force has a lever arm that produces torque which is small and can be neglected safely.
• It is assumed that the tensile flange of the gantry girder doesn't offer any resistance to the lateral loads.

2. Drag load: Also called as longitudinal loads

• stating and stopping of the crane girders produces drag loads on the gantry girders.
• This thrust produced along the rails.
• Max. drag loads acts when electrically operated cranes applies brakes suddenly.
• The frictional resistance developed due to locked wheels supplied by the rails and turn get distributed to the cranes columns