Ductile Cladding Connection Systems for Seismic Design.
Ductile Cladding Connection Systems for Seismic Design.
(12297 K)
Goodno, B. J.; Craig, J. I.; Dogan, T.; Towashiraporn,
P.
NIST GCR 98-758; 177 p. October 1998.
Available from:
National Technical Information Service
(NTIS), Technology Administration, U.S. Department of
Commerce, Springfield, VA 22161.
Telephone:
1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB99-105124
Keywords:
cladding; seismic design
Abstract:
Prior analytical and experimental studies by the authors
over the past several years have shown that promising
levels of seismic response attenuation can be designed
into new and existing building structures through use of
"advanced" connections for precast cladding systems.
This report provides a brief summary of past work then
describes analytical and experimental studies of several
developmental "advanced" cladding connectors. The
connectors were designed to provide ductility and energy
dissipation through relative displacements between the
structure and the cladding panels. A test fixture
designed as part of an earlier doctoral thesis is
described along with a summary of the results from a
family of flexural connectors developed as part of the
same thesis. Tests were performed on flexural and
torsional designs as well as on composite laminated
neoprene and steel isolating pads enclosed within steel
flexures for bearing applications. Nonlinear analytical
models developed for the various connector designs were
incorporated into existing nonlinear software for time
history dynamic analysis of planar structural systems.
Optimization of the connector properties for an actual
20 story building application resulted in controlled
energy dissipation in the cladding connectors, and
reduced demands on the supporting structural framework.
Results for this building showed that either up to 41%
reduction in peak displacement response could be
achieved from the baseline (as-built) configuration by
retrofitting advanced cladding connectors, or else as
much as a 17% reduction in structural weight (in the
longitudinal direction) could be achieved for the same
baseline response level. This suggests that use of an
energy dissipating cladding system could lead to either
improved serviceability (reduced drift) or else a
savings in structural steel, or some combination of
both.
