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- To: seaint(--nospam--at)seaint.org
- Subject: Re: diffential settlement- Reply
- From: Structeng1(--nospam--at)aol.com
- Date: Sun, 27 Sep 1998 01:14:43 EDT
Well thank you Brian and Todd, You're both right about there not being much literature on recommendations for slab-on-grade flatness. I did find something in ACI regarding new construction and the acceptable tolerances that dealt with F factors (I believe Brian mentioned this in his response). (Boy was that dry reading.) In fact I've heard that engineers who are in litigation have referred to this article as a baseline. I should have given some background as to what prompted this whole thing. As I said before this is a tilt-up building that was built in about 1978. The tenant of the building informed the owner that a panel joint had separating, "as if the panel had rotated about its axis." Our firm was asked to investigate the cause. The panel joint had in fact separated and the chord steel (2-#5) at the top of the panel had completely fractured. Since the panel joint was at the end of the diaphragm and not the middle and no other panels appeared to be separating we did a local manometer survey to check the levelness of the slab. This produced differential elevations that lead us to believe the foundation had a settlement problem. A manometer survey of the entire slab was recommended and has since been performed. The results of the latest survey show in fact that the slab-on-grade of the area in question, has uniformly settled relative to the rest of the building quite a bit. (The contour lines suggest some deep seated consolidation.) We are suggesting that the owner hire a geotechnical engineer to investigate the cause and if in fact it will continue. Obviously, any repair that needs to be made on the chord steel must be done after we find out what is causing the settlement problem and the solution to mitigate it. So the drama continues.... Well, I was surprise that I only received two responses, but then again this is more on the civil/geotechnical side however it did eventually effect the structural side. Funny how that works :-) !!! By the way, Todd, I completely understood when you mentioned "beating a subject to death" we engineers tend to do that best :-) . Thanks for the input...and if you have any more, I'd appreciate it. Michelle Kam-Biron, S.E.
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