the torsion load at wall 2 is about 67 k-'
2007/4/15, refugio rochin <fugeeo@gmail.com>:
> I have a scenario that I am losing sleep over.
> So, I think I would like some opinions from the "been there done that" peoples.
>
> Between two perpendicular wall segments, sketch below
>
> __________________________<wall 1
> | | |
> | _______| |
> | | ^ |
> | | < cranked beam |
> |____ | |
> | |
> ^wall 2 ^wall 3
>
> there is a cranked beam (torsion beam). Between the cranked beam and
> wall 3 is a floor, suspended by the cranked beam and the wall. In
> between the cranked beam and wall 2 is a stair. which lands at the
> portion of the cranked beam terminating into wall1. total length of
> wall 1 is about 28 feet. the stair lands about midway.
>
> the floor uses office live loading 50 psf, and is a joist and deck floor.
>
> Now, wall 2 ends just past the beam and also has a beam landing on it
> supporting one wall of load and a roof and one floor length. of the
> same joist and deck floor. It is a 12" solid grouted block wall below
> into an 8" block wall above. The wall 1 is an 8" block wall solid
> grouted below, into an 8" block wall above.
>
> Now, I can design a beam internally to the walls which takes the
> cranked beam ends and the torsion loads. However, my main concern is
> what the blockwalls can take. I can provide the beam loads tomorrow
> morning. My calculations show it can be done, but perhaps I am
> missing some elements of surprise... I am happy to share my calcs
> with an engineer that would be so happy to gander and give me their
> thoughts.
>
> cranked beam size: 10"x 24" with 4 #5 bars top and bott, and 4
> intermediate #5 bars spaced in pairs... wall 1 beam is 8"x 48"beam w/
> 14 #5 bars and #3@3"o.c. stirrups. wall 2 beam is a conjoined beam
> 12"x 26" beam + 8"x 16" beam. The 12x 26 beam has 4 #5 bars top and
> bott and 4 intermediate #5 bars and the 8x16 portion has 8 #5 bars
> which round it out. there are two sets of #3@3"o.c. stirrups which
> are overlapped about 8 inches.
>
> Best Regards,
> Refugio Rochin
>
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