Unique Aspect in Strength Design of Post-Tensioned Structures
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October 15, 2024; 11:00 AM – 1:30 PM Pacific Time
Bryan Allred, S.E.
The tension force in unbonded strands that is used in the Whitney Stress Block, is determined by multiplying the section area by the fps value. Two equations are used to calculate fps and are separated by the span to depth ratio. Unlike rebar only concrete which has a constant fy value, fps is constantly changing along each span and can often switch equations within the same design strip. These creates unique numerical situations that will look odd, challenging to explain and need to be better understood by the engineer to avoid confusion in the office and on the drawings. The role and rationale behind compression reinforcement in flexural strength will also be addressed.
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.
October 15, 2024; 11:00 AM – 1:30 PM Pacific Time
Bryan Allred, S.E.
The tension force in unbonded strands that is used in the Whitney Stress Block, is determined by multiplying the section area by the fps value. Two equations are used to calculate fps and are separated by the span to depth ratio. Unlike rebar only concrete which has a constant fy value, fps is constantly changing along each span and can often switch equations within the same design strip. These creates unique numerical situations that will look odd, challenging to explain and need to be better understood by the engineer to avoid confusion in the office and on the drawings. The role and rationale behind compression reinforcement in flexural strength will also be addressed.
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.