Theatre Design & Technology - Spring 1988 - 16

CONCLUSIONS

~550
.~

The results of this study can be summarized as follows:
1. Dynamic or live loads produce significant in-

creases in the magnitude of platform deformations.
These increases are proportional to the initial impact energy (weight x height! the loading object
possesses before striking the platform deck.
1. The magnitude of the defonnation generated by a
live load is not only a function of the nature of the
structure and material but also the nature of the
moving object.
3. For the limited tests completed, the dynamic response of Platform D appears superior to the other
configurations. The 2" x 4" frame with Yo" OSB
Flakeboard typically experienced the lowest center
deflection for an impact load and best vibration
dampening characteristics.
-1-. Use of metallic frames for modular staging may
produce more durable, lighter and stronger platforms, but these stlUCtureS will be more subject to
vibration and bounce when live loads Iperformersl
are present.
POSTSCRIPT

One of the initial iments of this study of dynamic or live
loads was to attempt to define a teclmique or process to
design modular staging for theatre applications. The results, as describe in this paper, indicate that the influences
of dynamic loads are very complex.
Based on our observations, at present it is not possible to
reconunend an appropriate design technique for structures of this nature when subjected to short-term live
loads. It is possible to define future areas of investigation
which may aid in producing a standard test procedure for

8
c
o

.~

-J

350
20 lb. Wl.

CJ

... 150
CJ

-J

C

0.02

0.04

0.06

0.08

0.10

0.12

Elapsed Time (sec.)
Figure 7: Illustration of the Influence of Different Drop - Weight Objects
which possess the same Initial Impact Energy of 60 ft.-lb.

such st1l.1Ctures and subsequently aid in the development
of design standards or procedures.
It is our hope that the work started at Wisconsin can
continue so the influence of performers on staging unitS
can be thorougWy documented. Much of this work would
be in the form of laboratory testing but with the hope that
we might also test a modular stage during performance.
The results of this research should help determine
whether some standardized drop-weight test could be developed to closely simulate human motion.
These are long term proposals that will require significant effort. However, modular staging units are unique
structures that do not lend themselves well to conventional design procedures. Therefore the importance of the
intended goal warrants significant effort.
ACKNOWLEDGEMENTS:

Figure 6: Displacement - Time Contour of Dynamically Loaded Modular
Staging Platform.

The research cited in this report has been supported by
grants from the University of Wisconsin Graduate School,
The College of Engineering of the University of Wisconsin,
and the USITT Endowment Fund.
The tests performed in this effort were conducted in
cooperation with the Forest Products Laboratory, U.S. Department of Agriculture, on the University of WisconsinMadison campus. We express our sincere appreciation to
the individuals of tillS facility.
"OTES

I. Dorn, Dennis, fames Keller, and Terry Richard," leasuring

the Deflection of Your 1\lodular Staging: Predicted and Actual," Theatre Design oj TechnoJog\: Summer 19 7, pp. I 23.
2. Countryman, D.R., \VA. Baker, i\I.A. O'Halloran, JD. Rose,
and I.R. Tissell, "Test i\lethods and Performance Requirements for Floor and Roof Sheathing," American Ply\'/ood
Association, Research Report l3S-C, December 1976.*

Terry Richard is Professor of Engineering Mechanics at
the University of \Ifisconsin-Madison: Dennis Darn is the
University Theatre Technical Director at the Universitv of
Wisconsin-Madison; lames Keller is the Technical Director for the Hartford Stage Company
14

TD&T'

SPRING 1 BBB



Table of Contents for the Digital Edition of Theatre Design & Technology - Spring 1988

Contents
Theatre Design & Technology - Spring 1988 - 1
Theatre Design & Technology - Spring 1988 - 2
Theatre Design & Technology - Spring 1988 - 3
Theatre Design & Technology - Spring 1988 - Contents
Theatre Design & Technology - Spring 1988 - 5
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
https://www.nxtbookmedia.com