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New Seismic Design Provisions for One-Story Structures with Flexible Diaphragms and Rigid Vertical Elements

by Kelly Cobeen, S.E. and John Lawson, S.E.

September 22, 2020; 11:00 AM - 1:00 PM Pacific Time

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ICC Preferred Provider #1467 ICC Preferred Provider Course Number: 25545

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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

Ms. Kelly Cobeen is an Associate Principal with Wiss Janney Elstner Associates and registered Civil and Structural Engineer. She has twenty-nine years of experience working in a wide range of project types, sizes and construction materials. She has a special interest in seismic resistance of light-frame construction, applicable to new construction and seismic retrofit of existing buildings. Ms. Cobeen has been involved in numerous code development, research and educational activities. Code development activities include involvement in the NEHRP Recommended Provisions for Seismic Regulations for New Buildings, in numerous Applied Technology Council publications, and International Building Code and International Residential Code development. Educational activities include coauthoring the Design of Wood Structures textbook, teaching wood design at UC Berkeley and seminars for professional organizations. Research activities include involvement in the CUREE-Caltech Woodframe Project, studying improved seismic performance for woodframe buildings.
John Lawson is an Associate Professor in Architectural Engineering at Cal Poly, San Luis Obispo, where he teaches structural wood design. He is a licensed Structural Engineer in California and Arizona, and has over 25 years of consulting experience as a licensed Structural Engineer. He holds a Master of Science in Structural Engineering from Stanford University, and a Bachelor of Science in Architectural Engineering from Cal Poly, San Luis Obispo. Lawson has received national awards in his building designs and his teaching methods.

Registration Information

1 Connection Each Additional Connection
Early Registration Discounted Fee* $260 $60
Regular Fee $275 $65
* Registration on or before August 9, 2020
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).