The
NEES-Soft Project
Seismic
Risk Reduction for Soft-Story Woodframe Buildings
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Project
Vision: The
vision for the NEESsoft project is twofold: To
provide a methodology to retrofit soft story woodframe
buildings to (1) protect life safety and property by avoiding soft story
collapse and excessive upper story accelerations, and (2) provide a mechanism
by which soft story woodframe buildings can be
retrofitted using performance-based seismic design (PBSD) to achieve a level of
performance commensurate with their stakeholders target. This vision will be accomplished through a
comprehensive combination of new numerical modeling procedures, hybrid testing
for validation of two levels of soft story woodframe
retrofit (i.e. ATC 71.1 and seismic protection systems), and system level
validation to better understand the mechanisms of woodframe
collapse and the effect of these two levels of retrofit on system
performance. Understanding the collapse
mechanisms and how to mitigate the risk imposed by them requires a
transformative leap in modeling and analysis of structures, resulting in the
ability to accurately predict performance over a wide range of seismic loading
conditions.
Expected
Project Outcomes: The following outcomes are expected as a
direct result of the research, education, technology transfer, and outreach
conducted within the NEESsoft project: (1) a
fundamental understanding of the collapse mechanisms and process for soft story
woodframe buildings; (2) experimental verification of
the ATC 71.1 retrofit procedure and potential improvements to the stiffness and
strength balance; (3) recommendations for the next update of ASCE Standard 41
for performance criteria for wood; (4) a performance-based retrofit methodology
for woodframe buildings which ties into outcome 3;
and (5) a method for and validation of the use of seismic protection devices
for retrofit of soft story woodframe buildings to
achieve improved performance.
NEES-Soft is
funded by the National Science Foundation under Grant No. CMMI-1041631
(NEES Research). Any opinions,
findings, and conclusions or recommendations expressed in this material are
those of the project team and do not necessarily reflect the views of the
National Science Foundation.