Dynamic Loading and Environmental Effects Flashcards

What is the effect of hoisting a load too quickly on dynamic loading?

Answer: It increases dynamic forces on the structure

Rapid hoisting increases acceleration forces, raising the dynamic amplification factor and placing greater stress on the crane structure than slow, controlled lifts.

How should crane operations be adjusted when the temperature drops significantly below freezing?

Answer: Equipment must be warmed up and manufacturer cold-weather procedures followed

Cold weather affects lubricants, wire rope flexibility, structural steel toughness, and hydraulic fluids, requiring warm-up procedures and potential capacity derating.

What is load swing and why is it dangerous during crane operations?

Answer: Load swing creates pendulum forces that can exceed static ratings and destabilize the crane

Load swing creates pendulum-like dynamic forces that can significantly exceed static load ratings, potentially causing the crane to tip or the load to strike workers or structures.

Which type of storm presents the greatest immediate hazard to crane operations through dynamic loading?

Answer: Thunderstorms with gusting winds and lightning

Thunderstorms combine dangerous gusting winds that create dynamic overloads with lightning strike risk, requiring immediate cessation of crane operations.

When calculating environmental loads on a crane, what property of the load most affects wind force calculations?

Answer: The surface area exposed to the wind

Wind force is calculated using the projected surface area of the load; larger surface areas create greater wind forces regardless of the load's weight.

What is the purpose of a dynamic load test on a crane?

Answer: To verify the crane can safely handle loads while in motion including accelerations and decelerations

A dynamic load test verifies that all crane systems, including brakes, clutches, and structural components, can safely handle loads while performing operational movements.