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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 Time

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ICC Preferred Provider #1467
ICC Preferred Provider Course Number: 29296

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Seminar Description

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.
The views and opinions expressed in this seminar are those of the speaker(s) and do not necessarily reflect those held by S. K. Ghosh Associates LLC.

Speaker Bio

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).

Registration Information

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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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Small Business Benefits and Eligibility


  • A connection is defined as a single web connection plus a single telephone connection (if necessary). If you want to sign up for more than one connection for this seminar, you will have the opportunity to do so after placing the seminar in your cart.
  • A $15 fee will apply if the seminar registrant wishes to revise the web seminar registration (e.g. switch from one web seminar to another).
  • Refunds are limited to 80 percent of fee and must be applied for in writing WITHIN THIRTY DAYS after the scheduled seminar.
  • We are a registered provider for continuing education in the State of Florida (Provider # 4732), the State of New York (Provider # 99), the State of New Jersey (Provider # 24GP00014200), the State of Maryland, and for the Structural Engineers Certification Board (SECB) of the National Council of Structural Engineers Associations (NCSEA).