Wheel loads on one-way slab: Moment in direction perpendicular to slab span
Wheel loads on one-way slab: Moment in direction perpendicular to slab span
(OP)
Is there any formula for determining the moment in the direction perpendicular to the span of a multispan one-way reinforced concrete suspended slab 300 mm thick and spanning 2.5 m onto supporting steel beams, due to heavy concentrated wheel load(s)?
Even a formula for a single wheel load would be a start. Or would we need to do a SAFE run? I want to determine if the normal temperature steel is sufficient or need more than that. (Can forget the steel beam deflection effect for initial analysis, I just included that for completeness of description).






RE: Wheel loads on one-way slab: Moment in direction perpendicular to slab span
RE: Wheel loads on one-way slab: Moment in direction perpendicular to slab span
RE: Wheel loads on one-way slab: Moment in direction perpendicular to slab span
When I do this by hand, I use the method shown below from British codes. Given how common the situation is, I've always been surprised that CSA/ACI don't have anything. I guess I can't just rely on codes to do all my engineering for me! Most hand methods will result in your determining an effective flexural width in the direction perpendicular to the span. I'll proportion the reinforcement in that direction assuming that the span needs to span across the assumed effective flexural width as a simple span beam/slab member.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Wheel loads on one-way slab: Moment in direction perpendicular to slab span
Also, Bridgebuster posted a link to the Westergaard article a while back in thread http://www.eng-tips.com/viewthread.cfm?qid=259491
RE: Wheel loads on one-way slab: Moment in direction perpendicular to slab span
To Kootk - yes we have people who are adept at SAFE and as you note that may be the best way to do it. But it would still be nice to have a manual check, and the material you and Lomaradil sent should help with that.
To Lomarandil - Can you help me to understand why you say that "Presumptively, for spans that meet the prescriptive requirements of AASHTO any longitudinal reinforcement is then adequate." I will have to study the AASHTO prescriptive requirements ...hopefully they have something about relating the longitudinal reinforcement requirements to the wheel load...do they? Also, one of my primary goals is to minimize cracking (and leakage at cracks) so it would seem to me that aspect could possibly require more longitudinal reinforcement than strength considerations alone. Do you agree?
Again thanks to all. I have some studying up to do, but any further comment would be welcome too