New Seismic Design Provisions for One-Story Structures with Flexible Diaphragms and Rigid Vertical Elements
by John Lawson, S.E.
September 28, 2021; 11:00 AM - 1:00 PM Pacific TimeSmall Business System Requirements FAQ Register
It has long been recognized that the seismic response of one-story tilt-up concrete wall buildings (and similar buildings with flexible diaphragms and rigid vertical elements) is controlled by the flexible diaphragm much more than the rigid vertical elements. Widely used seismic design provisions have not recognized or incorporated this behavior, however. Now, new seismic design provisions recently developed for ASCE 7-22 explicitly recognize this response behavior, drawing from extensive numerical studies published in the guideline document Seismic Design of Rigid Wall-Flexible Diaphragm Buildings: An Alternate Procedure (FEMA P-1026) and supplemental studies of bare steel deck diaphragms. In fact, the new design provisions go a step further to introduce a zone of reduced shear demand that improves seismic performance by allowing distributed yielding away from the diaphragm perimeter. This webinar will first present the concepts behind the new seismic design provisions, and the numerical studies addressed in FEMA P-1026 and supplemental bare steel deck diaphragm studies. A design example will then be presented, along with design and detailing tips and recommendations for practicing engineers.
ICC Preferred Provider Course Number: 29296
John Lawson, S.E. is Professor in Architectural Engineering at California Polytechnic State University (Cal Poly), San Luis Obispo, and is a registered Civil and Structural Engineer with more than 25 years of design experience. His past design work includes over 100 million square feet of one-story rigid wall-flexible diaphragm buildings in high seismic zones. His research interests have been focused on this building inventory, and is a co-author of Seismic Design of Rigid Wall-Flexible Diaphragm Buildings: An Alternate Procedure (FEMA P-1026).
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|* Registration on or before September 26, 2021|
Please note a single registration allows you to have one connection. However, a number of people can view and listen to the seminar using one connection by using an LCD projector (or a large computer monitor) and good computer speakers or a speaker phone.
All attendees, irrespective of the number of registered connections, can earn 0.2 Continuing Education Units (CEUs) or 2.0 professional development hours (PDHs). CEU/PDH certificates are provided free of charge.
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