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Home > Forums > Structural Engineers > Activities > Structural engineering other technical topics Forum

Structural question

Read More Threads Like This One

faisal45 (Structural)

27 Apr 12 14:05

Dear all,
i just want to know is it possible to perform a design two way slab using flat plate which has two span only.i attached a file i can provide beam only to the stair portion but i cannot provide beam in other portion because of architectural requirements. please consider RCC Slab.

Thank you.

Regards
Engr. Faisal

hokie66 (Structural)

27 Apr 12 17:51

It is possible.

asixth (Structural)

27 Apr 12 20:55

Yeah, the spans on that slab do not look very big so there would be no reason why a flat plate couldn't work. And residential loading is not very high (40psf). Probably should have a higher superimposed dead load for the wet areas (25-30psf). Using the rule of thumb span/25 I would be looking at 8" slab (maybe 7-1/2").

msquared48 (Structural)

28 Apr 12 14:23

I agree. Very doable.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

faisal45 (Structural)

30 Apr 12 14:27

D asixth,
why will i go for thumbs? as we know for the flat plate
thickness of interior span = lc/33 and for
exterior span = lc/30 where lc = clear span.
by this formula we get 6" slab thickness which will be economical for this project. do you have any other reasons not to provide 6".

For all
is flat plate really can resist in dynamic load analysis?
or there is a problem? explain.

CJPW (Structural)

30 Apr 12 15:36

either use the lower bound hillerborg strip method Strip Method or upper bound Johansen Yield Theory

wardak21 (Civil/Environmental)

30 Apr 12 22:58

Dear Faisal,
Regarding your last Q,

(Is flat Plate really can resist in dynamic load analysis?)Is not clear.

I think Flat Plate can resist any type of loads as the other types of slab can do; the difference is only in vibration phenomena/problems.

asixth (Structural)

4 May 12 7:18

Rules of thumb are only indicators and 25 is what I feel comfortable with for end spans and simple spans. If 6" ticks all the boxes for strength, service, fire, acoustics then go for it.

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