The Tall Buildings Initiative - Printable Version

The Tall Buildings Initiative - Printable Version

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The Tall Buildings Initiative - TAFATNEB - 09-14-2013

The Tall Buildings Initiative

Several west coast cities are seeing an upsurge in the
construction of high-rise buildings. Many of these buildings
feature framing systems, materials, heights, and dynamic
properties not envisioned by our current building code
prescriptive provisions. Rather than force these buildings to
conform, many jurisdictions are allowing these new designs
to proceed under the alternative procedures provision of the
building code, which allows alternative lateral-force
procedures using rational analyses based on well-established
principles of mechanics in lieu of the prescriptive provisions.
Most designs are opting for a performance-based approach in
which a rational analysis demonstrates serviceability and
safety equivalent to that intended by the code prescriptive
provisions. Several questions arise in a performance-based
design. What is equivalent performance? How should it be
demonstrated? If dynamic analysis is conducted for a range
of anticipated earthquake ground motions, how should the
ground motions be selected and how should the design value
determined? How should performance designs be reviewed?
The Tall Buildings Initiative is funding a range of short to
intermediate-term projects in 2006-2009. The final product
will be a set of written guidelines containing principles and
specific criteria for tall building seismic design. The
document is intended to support ongoing guidelines and
code-writing activities of collaborating organizations, as well
as being a stand-alone reference for designers of high-rise
buildings.

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