unusual, or innovative materials, systems or methods
portion of the "Modified Reiher-Meister Scale" or
may be incorporated into designs when evidence shows
equivalent vibration perception/acceptance criteria.
that such use is in the best interest of the Government
Recommended vibration design criteria for general office
from the standpoint of economy, lower life-cycle costs,
will be based on T. M. Murray, "Tips for Avoiding Office
and quality of construction. When new and innovative
Building Floor Vibrations," Modern Steel Construction,
methods and materials are proposed for a specific
March 2001. More stringent vibration considerations may
building, a peer review panel, determined by GSA, shall
be required for fixed seating areas such as those in the
evaluate the adequacy of the methods, systems and
courtrooms or judges' chambers.
materials proposed by the engineer.
Seismic Instrumentation for Buildings
Base Isolation. Base isolation shall be considered for
New and existing buildings located in Regions of High
buildings located in Regions of High Seismicity for two
Seismicity over six stories in height with an aggregate floor
to fourteen story buildings, particularly on rock and firm
area of 60,000 square feet (5574 m2) or more, and every
soil sites which are stable under strong earthquake ground
building located in Regions of High Seismicity over 10
motion. The base isolation system must be shown to be
stories in height regardless of floor area, shall be provided
as cost effective as conventional foundation systems.
The effects of the base isolation system on the framing,
mechanical, and electrical systems shall be included in
the evaluation of cost effectiveness.
dissipation systems shall be considered for buildings
located in Regions of High Seismicity.
Progressive Collapse
Refer to Chapter 8: Security Design.
Floor Vibration
The floor-framing members shall be designed with a
combination of length and minimum stiffness that will
not cause vibration beyond the "slightly perceptible"
Base isolator installation at the historic Pioneer Courthouse,
Portland, OR
113
STRUCTURAL
ENGINEERING
4.4
Structural Considerations
Revised March 2005 PBS-P100
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