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2 Part Webinars on Design of Post-Tensioned Diaphragms

by Bryan Allred, S.E.

PART 1: August 16, 2022 August 30, 2022; 11:00 AM - 1:00 PM Pacific Time

PART 2: August 18, 2022 September 1, 2022; 11:00 AM - 1:00 PM Pacific Time

Small Business System Requirements FAQ

Register for PART 2

ICC Preferred Provider #1467
ICC Preferred Provider Course Number for PART 1: 26134
ICC Preferred Provider Course Number for PART 2: 26135

Receive a 15% discount on any of our products when purchased with a seminar registration.

Seminar Description

The webinar will cover the design of post-tensioned diaphragms highlighting the benefits of precompression to reduce or eliminate additional drag and chord reinforcement. The webinar will also discuss how concrete diaphragms should be modeled and how a traditional steel or wood diaphragm approach does not apply to a concrete membrane. Construction photographs and details will be shown to clarify the design intent.

Part 1:
  • Diaphragm Forces
  • Diaphragm Analysis – Different Approaches
  • Moment and Shear Diagrams
  • Diaphragm Design – Two Methods Used – Wood versus Concrete
  • “Wood” Design Example
Part 2:
  • Diaphragm Design – Concrete Method Example
  • Comparison between Different Methods
  • Use of Precompression in Diaphragm Design
  • Collectors and use of Omega Factor
  • Detailing
  • Chord Design
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

Bryan Allred, S.E. is a licensed structural engineer who specializes in the design of reinforced concrete buildings utilizing post-tensioned floor systems. He is the co-author of the book “Post-Tensioned Concrete Principles and Practice” which covers the design of post-tensioned concrete structures from basic fundamentals to specific construction detailing. Bryan is a fellow of the Post-Tensioning Institute (PTI), a member of their Building Design Committee and has given numerous PTI educational seminars across the country highlighting the use and benefits of post-tensioning.

Registration Information

1 Connection 2 Connections 3 Connections 4 Connections 5 Connections > 5 Connections
Early Registration
Discounted Fee*
$260 $460 $585 $640 $725 $130
per connection
Regular Fee $275 $490 $630 $700 $800 $145
per connection
* Registration for PART 1 on or before August 28, 2022
* Registration for PART 2 on or before August 30, 2022

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.

Small Business Registration

We provide discounted registration for small businesses. If you are not registered with us as a small business yet, please click below for more information.

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).