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Webinar – Part 3: Cantilever Diaphragm Design, Flexibility Check, and Drift Calculations

February 11, 2020 – 12:00 pm - 1:00 pm




This month’s special 4-part webinar series is a chance to gain expertise on open-front or corridor-only shear wall diaphragms. It’s presented by one of the foremost experts in the field, Terry Malone, who literally wrote the book on irregular diaphragms.

Join us Tuesdays and Thursdays from Feb 4 to Feb 13:

10 am Pacific, 11 am Mountain, 12 pm Central, 1 pm Eastern

Part 3 / Feb 11 – This webinar takes an in-depth look at cantilever diaphragm design processes. Using calculation steps per ASCE 7 and the 2015 edition of the American Wood Council’s Special Design Provisions for Wind & Seismic (SDPWS), diaphragm force distribution will be used to illustrate diaphragm design procedures in an open front structure. Diaphragm chord forces, chord slip, and chord design and detailing will all be examined. Diaphragm flexibility will also be analyzed, reviewing options proposed for the 2021 SDPWS and other rational, engineering judgement-based approaches. Finally, diaphragm deflection and story drift calculations will be explained, emphasizing factors that contribute to story drift in a cantilever diaphragm, and measurement criteria.

If you missed Part 1 or 2, they can be viewed in the archive (without credit). You can also register now for:

  • Part 4 / Feb 13 – Torsional Irregularity and Design Example Checks of an Open Front Building – Details / Register


Terry Malone, PE, SE, WoodWorks

Terry is a licensed structural engineer in Washington, Oregon and Arizona. Prior to joining WoodWorks, he was a principal in consulting structural engineering firms in Washington and Oregon, conducted third-party structural plan reviews and has served as a faculty member at St. Martin’s College in Lacey, Washington. Terry has over 35 years of wood design experience and has taken an active role as a presenter providing seminars at state and local ICC chapters and professional engineering organizations. Terry is author of The Analysis of Irregular Shaped Structures: Diaphragms and Shear Walls, published by McGraw-Hill and ICC. He is a member of the Structural Engineers’ Association of Arizona and the International Code Council.

Attendees will qualify for 1 AIA/CES HSW LU, 1 PDH credit or 0.1 ICC credit (FBPE board-approved).

Certificates will be emailed to participants.


If you are attending the webcast as a group, each person in your group requiring a certificate of attendance must sign the Group Sign-in form.

  • Download and print ONE sign-in sheet for your group.
  • Return the completed sign-in form by email within 48 hours to .
  • WoodWorks will send each attendee a certificate of completion within 2 weeks.

With GoToWebcast there is no software to download. You join and listen as you would a YouTube video – it is a live feed and you can use your computer speakers or a headset to listen.

To register in advance click on the Register button, answer a few questions and once finished exit out of the browser. You will receive a confirmation email with the link again provided to join at the time of the Webinar. To join the live event click on the link, under ‘Already Registered’ enter your email address and login.

Using IE on Windows 7? Please use a different browser or install/enable Flash to stream on IE.

Need more information on joining our Webinars? Check out the GoToWebcast Information tab for how to register, requirements and more.

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February 11
12:00 pm - 1:00 pm
Event Category:

WoodWorks offers a wide range of in-person and online training opportunities, from Wood Design Symposiums that include concurrent seminars and a trade show, to half-day workshops, lunchtime seminars and webinars.