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Re: footings a beam or a slab?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: footings a beam or a slab?
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: 01 Oct 98 10:22:26 -0400
Mike Brown wrote: > As for the reinforcing in the transverse direction, an argument can be made stating that there is no flexure in this direction (assuming the wall is centered on the footing). To back this argument up, the maximum flexural stress occurs at a distance 'd' from the face of the wall ('d' is the depth of the footing to the tensile reinforcing)....The vertical forces from the wall are transferred directly to the soil without putting the footing in flexure in the transverse direction. In other words, there is no tension zone in the transverse direction....If anyone does not agree with the above, please respond. < I do not agree. Please read ACI 318-95, Sections 8.7.3, 11.9.1/11.9.3, and 22.7.5. Maximum moment is at the face of the wall - or even within the wall if it is masonry (22.7.5(b)). In corbel design, it is clear that tension due to the eccentricity still occurs even when a/d<1. The footing could be designed as plain concrete per Sections 22.2/22.7. Personally, I always use transverse reinforcement and satisfy Section 10.5.4.
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