In the drawing, a schedule for deflection is provided, which requires a 1 1/2" deflection where beams are located 30' or less. I asked the architect for the project if this was to be 3/4" up and 3/4" down. He stated the EOR said it was provided for down only. Is that typical to have 1 1/2" deflection for down only? It seems to me that a building could deflect up or down.
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Deflection on multi-story commercial building
- Thread starter eatapeach
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Depends on what it is, but usually it's just down. At the roof you may get some upward deflection due to wind uplift, but it's usually very small, especially in heavier commercial buildings where the roof is concrete and the dead load negates much if not all of that uplift.
There are other unique cases, such as continuous beam systems, that can result in some wonky deflected shapes, but then those are typically at the roof since continuous beam systems can cause all sorts of stability issues if you put them in lower - the detailing and fab is often more expensive than it's worth.
There are other unique cases, such as continuous beam systems, that can result in some wonky deflected shapes, but then those are typically at the roof since continuous beam systems can cause all sorts of stability issues if you put them in lower - the detailing and fab is often more expensive than it's worth.
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