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Post-tensioned design: perimeter beams in a 2-way slab

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peal724

Structural
Apr 2, 2011
35
question_1_jzuw2z.jpg
question_2_blew8m.jpg
General info:
2-way post-tensioned flat plate using banded-distributed tendon layout, banded in North-South, distributed in East-West, unbonded tendon design
Perimeter beams are being used to support a masonry veneer façade and also as part of a moment frame for wind/seismic loads
Using Adapt PT/RC software in 2D equivalent frames

Question 1, see attachment
Part 1: For exterior design strips that have a beam as the perimeter member in the banded direction (Beam 1 and Beam 2 in the sketch), is it applicable to switch from the PT 2-way slab module to the PT Beam module and design this beam for all forces associated with the exterior design strip?
Part 2: For exterior design strips that have a beam as the perimeter member in the distributed direction (Beam 3 in the sketch), is is applicable to 1) design the slab with the PT 2-way slab module and then 2) design the beam with the PT beam module excluding any loads from the slab design strip?

Question 2, see attachment.
Are there any design examples for a post-tensioned transfer beam? See attachment where a beam, similar to the perimeter beams in the previous question, has a change in cross-section where an increase in depth is needed to serve as a transfer beam for a column. My proposed tendon layout is to have tendon group 1 that is fully stressed with the floor at that beam’s level, and then tendon group 2 that is sequentially stressed as load is applied to the transfer beam from the column.

Thanks in advance.
 
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