This 1.75 hour lecture by K. Dirk Bondy, S.E. contains detailed instruction on how to design and detail a post-tensioned concrete diaphragm.  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.

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