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Re: beam camber...

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Does it have an inverted WT welded to the bottom that may not be showing on the plan? I see that one quite a bit and the WT terminates a few feet from the columns/girders to allow for HVAC duct runs.

It does appear to be too flimsy at first glance and a quick check I did appears to show it's not even close. Those TL deflections are obviously unacceptable. I think your numbers are about right...I doubt with LL reductions it will work either (I didn't do the reduction)

-g

On 4/30/07, David Fisher <dfisher(--nospam--at)fpse.com> wrote:

List members:

We are currently designing a multi-story office building in Florida.

We have been shown a "prototype" by another engineer with the following

Parameters:

Purlin:              40 ft span

                        100 psf LL

                        5" composite slab (2"+3" NWT)

                        Beam spacing: 10'

                        W18x35 Fy = 50 ksi with 52 shear studs

                        Camber <1 ¾">

                        DL deflection:    2.14"                 L/224

                        LL deflection:     1.25"                 L/386

                        TL deflection:     3.39"                 L/142

 

My staff and I think this doesn't even come close to working, even with the camber.

Comments?

           

 

David L. Fisher SE PE

Senior Director

 

Cape Cod Grand Cayman Holdings Ltd. - Cayman

Fisher+Partners Structural Engineers Ltd. - Cayman

980 North Michigan Avenue #1640 Chicago 60611

75 Fort Street Georgetown Grand Cayman BWI

319 A Street Boston 02210

 

 

312.573.1701

312.573.1726 facsimile

312.622.0409 mobile

 

www.ccgch.com

www.fpse.com

 

 

 

 




--
-gm