Theatre Design & Technology - Spring 2013 - 49

Loads
ExamplE: A 200-pound man wearing a safety harness and lanyard falls
6 feet. As he stops, the harness and lanyard stretch 6 inches (or .5 feet).
What is the force on him and the rigging that supports him?

est, that number in the example, half a foot, was made up. The actual
stopping distance is determined by the elasticity of the material stopping
the fall.
The equation for calculating the shock load when a wire rope stops a
falling object, taking into account the elasticity of wire rope, is:

Note: Remember to keep all measurements in feet.

( √

Shock Load = Load × 1+ 1+

( )

6 +1
Force = 200 × 0.5

n

Force= 200 × (12+1)
Force = 200 × 13
Force = 2,600 pounds

If this number seems large to you, it is; but it is also correct. It would
also probably be fatal. Shock loads can be huge; that is why you want to
avoid them at all costs.

Shock load on wire rope
The equation used above to calculate the force of a falling object is
straightforward, and it is easy to see how most of the numbers were
derived. But, where did the stopping distance come from? To be hon-

where . . .

2 × FD × Area × E
Load × Length × 12

)

load is the weight of the falling object in pounds;
Falling Distance (FD) is in inches;
length of wire rope is in feet;
modulus of Elasticity (E) is in pounds per square inch (psi).
Note: The modulus of elasticity for wire rope that has the structural stretch removed, either through pre-stretching or through
use is, 15,000,000 psi. New wire rope has a modulus of elasticity of
11,500,000 psi.
area (Equivalent Metallic Area in square inches) = Diameter of wire rope
(in inches) × Diameter of wire rope (in inches) × Area Factor.
Note: Area factors of commonly used wire ropes are listed in the table
on the next page.

s p r i n g 2013

theatre design

& technology

47



Table of Contents for the Digital Edition of Theatre Design & Technology - Spring 2013

Contents
Theatre Design & Technology - Spring 2013 - 1
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