Performance-Based Procedure for Direct Displacement Design of Engineered Wood-Frame Structures
Publication: Journal of Structural Engineering
Volume 136, Issue 8
Abstract
This paper reports on a study to extend a recently proposed direct displacement design (DDD) procedure for midrise engineered wood-frame structures and develop a set of factors for use in the procedure to meet specified performance levels with certain target probabilities. Representative index multistory building configurations were selected from the archetype buildings developed for the FEMA ATC-63. Seismic hazard levels and performance requirements recommended by ASCE 41-06 and modified for use in the National Science Foundation sponsored NEESWood project were used. The archetype buildings, originally designed using current force-based design procedures, were redesigned using the simplified DDD procedure (also described herein) with a range of nonexceedance (NE) probability adjustment factors . Specifically, the design interstory shear forces and the sheathing nail spacings were determined for each structure designed using . Nonlinear time-history analysis was performed for each archetype structure under the 2%/50 year seismic hazard level and peak interstory drift distributions were developed. The NE probability at the 4% drift limit was then plotted against building height and design charts were developed for each different value of . Given the building height and desired NE probability, engineers/designers can select the appropriate minimum value of using these charts. Additional analyses could be performed to consider other hazard levels and performance requirements. Using design charts of this type, engineers/designers are able to specify a target drift limit as well as a target NE probability when using the simplified DDD procedure. Thus, a true performance-based procedure for the seismic design of midrise wood-frame structures is described.
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Acknowledgments
The writers gratefully acknowledge financial support for this research provided by the National Science Foundation (NSF) and the Network for Earthquake Engineering Simulation (NEES). The writers are also grateful to Andre Filiatrault and Kelly Cobeen for providing the ATC-63 archetype building drawings.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 136 • Issue 8 • August 2010
Pages: 978 - 988
Copyright
© 2010 ASCE.
History
Received: Jun 16, 2009
Accepted: Jan 17, 2010
Published online: Jan 22, 2010
Published in print: Aug 2010
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