Theatre Design & Technology - Fall 2019 - 49

(d1)

(h1)

H1 (feet)
Fig.
2
10

(d2)

V1 (feet) H2 (feet)
10
10

L1 Length (?)
14.14

Version .622

(h2)

(w)

(w1)

(w2)

V2 (feet)
10

Load (lb)
100

Cable Wt 1 (lb/?)
0.46

Cable Wt 2 (lb/?)
0.46

Bridle Leg 1 Data
*Cable Weight

S1 Length (?)
Lower End Tension (lb) Upper End Tension (lb)
1/2" dia. wire rope =
0.46 lb/A
14.143/8" dia. wire rope =72.99 0.26 lb/A
77.59
1/4" dia. wire rope =

Weight of Leg (lb) Angle of Leg (deg)
6.50
45.00
Equilibrium CondiEons SaEsfied

0.12 lb/A

S1 Mid-Span Perpendicular DeflecEon (?)
0.15

Fig. 3

Bridle Leg 2 Data

L2 Length (?)
14.14

S2 Length (?)
14.14

Weight of Leg (lb)
6.50

Angle of Leg (deg)
45.00

the cells in the third and fourth sections.
Remember, any time any of the seven
data entries is changed, you must reclick on this button to re-run the macro.
Note: The notations in parenthesis above the seven data entry cells
are the variables names used in the
macro, for each data item. You can
look at the actual macro by going to
Tools>Macro>Macros... and then click-

Lower End Tension (lb)
72.99

Upper End Tension (lb)
77.59

S2 Mid-Span Perpendicular DeflecEon (?)
0.15

ing on the "Edit" button to open Excel's
Macro Editor.
Sections three and four provide the
output about the bridle legs Leg 1 (Blue)
and Leg 2 (Orange). See Figures 2 and 3
for the calculated outputs.
These sections show the length of
the cords (L) along with the length of
the bridle legs (S). They also show the
Lower End Tension, the Upper End Ten-

Equilibrium CondiEons SaEsfied

sion, the Weight of each leg, the Angle of
each leg from horizontal, and the MidSpan Perpendicular Deflection length.
We might
call this
bridle.(?)
L2 Length
(?)a "normal"
S2 Length
The legs are14.14
at 45 degrees to horizon14.14
tal and their lengths are relatively short.
When Weight
we compare
the lengths
the (deg)
of Leg (lb)
Angleof
of Leg
cords (L) to the
calculated
bridle
lengths
6.50
45.00
(S) we see that they are the same. In
other words, the Pythagorean Theorem
would work perfectly for this bridle. But
let's look at an example where one leg
is long (200 feet) and the wire rope is
heavier. See figure 4 for the updated inputs and figures 5 and 6 for the updated
outputs.
Look at the results for Bridle Leg
2. In this example, we can see that the
calculated bridle leg length (S2) is over
five and a half feet longer than the cord
length (L2). Without adding this additional length of cable to this bridle leg,
the apex would not hang at the desired
location. You should also note that making Leg 2 longer significantly decreases
the tensions on Leg 2, but significantly
increases the tension on Leg 1.
It is important that riggers under-

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Theatre & Drama

The Heiress (2018). Photo by Jeremy Hogan

FALL 2019

|

THEATRE DESIGN & TECHNOLOGY

| 49


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Theatre Design & Technology - Fall 2019

Table of Contents for the Digital Edition of Theatre Design & Technology - Fall 2019

Contents
Theatre Design & Technology - Fall 2019 - Cover1
Theatre Design & Technology - Fall 2019 - Cover2
Theatre Design & Technology - Fall 2019 - 1
Theatre Design & Technology - Fall 2019 - Contents
Theatre Design & Technology - Fall 2019 - 3
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