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ACI 318 chapter 20

ACI 318 chapter 20

RE: ACI 318 chapter 20

Well, I'll post my experience here - but others out there - do add any insights above and beyond this:

I did a load test once on a small grandstand - made of load bearing CMU with double tees forming each riser.  No one had a clue where the DT's came from and what load capacity they truly had.

I had a number of barrels set up in a specified spacing to load the grandstand to 125% of the required live loading for grandstands (100 psf I think it was).  The loading was performed by adding water to the barrels - calculating the volume in each barrel, the resulting weight, and the barrel spacing to mimic 100 psf.

I took vertical elevation measurements of the DT's prior to loading, at 1/4 loading, 1/2, 3/4 and full loading.  Then removed the load, took measurements, and then took them again I think at 24 hours later.  (I don't have ACI with me right now but this is what I recall).

ACI provided design criteria for the deflection and deflection-rebound.  

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