Theatre Design & Technology - Spring 1988 - 12

Observations on the
Dynamic Response ~
Modular Staging PlaUorms
By Terry Richard, Dennis Dorn, and James Keller
INTRODUCTION

This article follows a recent paper l on the effects of static
loading on modular staging - platforming typical of the
type being fabricated in educational and regional theatre
scene shops across the COUll try. Here the discussion has
been expanded to include the mechanical response of the
modular staging to "live" or "dynamic" loads.
In the context of this paper, dynamic forces are those
which a modular platform unit may experience over a very
short period of time and which change very rapidly during
the period they are applied. The intent of this investigation
has been to define the influence on staging of performers,
wagons or other units that might be considered live loads,
and to illustrate the dramatic increase in force and deformation that a dynamic situation can generate.
In the design phase (shop drawings) of modular platform
construction particular attention is devoted to identifying
the deflections a staging component will experience. Design is often based on a specific allowable deflection which
the platform can sustain before it is considered unsuitable
for use. Materials and framing configuration are chosen
typically to minimize deflections.
Because of these design criteria, tests were directed toward the measurement of the maximum deflections of the
10

TD&T'

SPRING 1 BSS

decking at different locations in the platform. A similar
type of investigation was published previously by the
American Plywood Association 2 j however, the goal of the
APA research was to define the maximum center displacement which occurred during the impact of a falling object.
With the computerized data acquisition system employed
in the research reported here, a complete time-deformation history of the modular platform was obtained at a
variety of instrumented locations (Figure 1). This allowed
not only a description of the maximum deformation at
different locations in the structure but also produced an
illustration of the vibrational flexure that modular platforms can experience.
Typically, modular platforms are built with an attempt
to maximize portability. This implies that the decking
(here referring to a combination of deck and frame materials) will be fabricated to produce a lightweight but strong
product. The supporting structure of this platform, the
"legging," is likewise built to be strong, light, and portable.
Conventional practice prescribes that the legs support the
platform at only six symmetrically-located points as illustrated in Figure 1.
As a result of the imposed criteria and fabrication techniques, the modular staging platform is typically far more
flexible than conventional commercial building decks or



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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