Seismic Deisgn of Post-Tensioned Concrete Diaphragms Webinar

Seismic Deisgn of Post-Tensioned Concrete Diaphragms Webinar
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Post-Tensioned Concrete Diaphragm Webinar

Purpose:  This lecture covers detailed instruction on how to design and detail a post-tensioned concrete diaphragm.  Topics covered include a discussion of the beginning steps in designing a diaphragm including a discussion of when computer analysis vs. hand calculations are needed.  A step-by-step design example includes discussion of critical code requirements, determination of the diaphragm forces, shear and flexural steel location, location of shear failure planes, and design of collector and chord elements in the diaphragm. 

Note:  The video is available to view for free by completing this free checkout process and downloading the webinar link.   To obtain PDH/CEU Credits, purchase and complete this quiz.

Instructor:  K. Dirk Bondy, S.E.  has been a practicing engineer since 1989. His professional interest and expertise is in the area of post-tensioned and reinforced concrete, steel, seismic design, seismic retrofit and vertical load retrofit. In addition to his structural design experience, Mr. Bondy currently teaches Prestressed Concrete Design at the University of California at Los Angeles in the Spring Quarter, and has been an instructor at the University of California, Irvine and California Polytechnic State University, Pomona where he taught courses on Pre-stressed Concrete Design, Reinforced Concrete Design, Steel Design, Structural Design and Seismic Design. He has also been published in numerous journals and conference proceedings. He is a registered Civil and Structural Engineer in the states of California, Nevada, Hawaii and Arizona as well as a licensed C50 contractor in the state of California.


  1. Purpose and Learning Objectives
  2. Introduction of design example
    1. Where do code equations come from?
    2. Determination of design loads
  3. Determination of diaphragm forces
  4. Design of diaphragm shear reinforcement (collector design)
    1. Shear failure planes
    2. Collector reinforcement
    3. Determine diaphragm shear capacity
    4. Check demand vs. capacity
    5. Determine the collector length required
  5. Design of diaphragm flexural reinforcement (chord design)
  6. Load path
    1. Additional dowel reinforcement
    2. Over strength factor in additional dowel reinforcement
    3. Design check of additional dowel reinforcement shear friction
  7. Code interpretation
    1. Chord compressive stress check
  8. Check compression in the diaphragm

At the end of this presentation you will be able to:

  1. Based on the discussion at the beginning of the webinar, identify the steps in the PT diaphragm design process that require computer analysis vs. hand calculations.
  2. Given the information presented in the webinar, identify critical code requirements related to the design of PT diaphragms.
  3. Given a simple building floor plan, explain where the shear and flexural steel should be located in the PT diaphragm.
  4. Given a simple building floor plan and shear wall locations, identify the expected location of the assumed diaphragm failure planes.
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