4.4 Structural Considerations
The goals in the selection of load resisting systems are
simplicity of the structural framing layout and symmetry
in the structural system reaction to design loadings. The
selection must consider the need for economy, function,
and reliability.
(LRFD) and Allowable Stress Design (ASD) are acceptable
design procedures for GSA buildings. If LRFD is chosen,
the design narrative must specifically address floor
vibration.
Cast-in-Place Systems. Systems that have fewer
limitations in cutting openings during future alterations
are preferred over other systems.
only be used for GSA office buildings when the design
can be demonstrated to adapt well to future changes in
locations of heavy partitions or equipment. Precast
systems may be considered for low-rise structures such
as parking garages, industrial buildings, and storage and
maintenance facilities.
Pre-tensioning and Post-tensioning. As with precast
floor framing, these systems should only be used when
the design can be demonstrated to not impede future
flexibility.
Innovative Methods and Materials. The use of special
construction is permitted when necessary, advantageous,
and economical. However, specifying new or untried
materials or methods of construction should be avoided
until the merits of the methods or materials have been
established. When the merits are established, new,
Steel bracing in the Milwaukee Courthouse
112 F A C I L I T I E S
STANDARDS
FOR
THE
PUBLIC
BUILDINGS
SERVICE
4.3 Structural Considerations
Revised March 2005 PBS-P100
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