Part 2 - Design of Post-Tensioned Diaphragms
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Format: Online Live
Duration: 2.00
As low as
$275.00
October 8, 2026
2:00 PM to 4:00 PM Eastern Time
1:00 PM to 3:00 PM Central Time
11:00 AM to 1:00 PM Pacific Time
Bryan Allred, S.E.
The webinar will cover the design of post-tensioned diaphragms highlighting the benefits of precompression to reduce or eliminate additional drag and chord reinforcement. A discussion of how concrete diaphragms should be model will be presented 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:
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.
2:00 PM to 4:00 PM Eastern Time
1:00 PM to 3:00 PM Central Time
11:00 AM to 1:00 PM Pacific Time
Bryan Allred, S.E.
The webinar will cover the design of post-tensioned diaphragms highlighting the benefits of precompression to reduce or eliminate additional drag and chord reinforcement. A discussion of how concrete diaphragms should be model will be presented 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
- Diaphragm Design – Concrete Method Example
- Comparison between Different Methods
- Use of Precompression in Diaphragm Design
- Collectors and use of Omega Factor
- Detailing
- Chord Design
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.
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.