Need a book? Engineering books recommendations...
Return to index: [Subject] [Thread] [Date] [Author]
Re: Question on need to use "skip" live loads in 2-way slabs
[Subject Prev][Subject Next][Thread Prev][Thread Next]- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Question on need to use "skip" live loads in 2-way slabs
- From: "Tim Allison" <AllisoT(--nospam--at)trusjoist.com>
- Date: Thu, 24 Oct 2002 06:15:47 -0600
I don't believe this posted on my first send
attempt...
That would be my guess as well. I think there may be some restriction
to it, along the lines that no span can be less than 1/3 or ½ of an adjacent
span, so uplift is not an issue? Perhaps this is addressed with the 75%
factor. I haven't performed calculations seeking the LL limit, but I have
noticed when the DL is significant, the alternating load conditions appear much
less frequently.
>>> smaxwell(--nospam--at)engin.umich.edu 10/23/02 11:42PM >>> Cliff, I _might_ know why, but haven't done the math to prove it. Sit down and do some calculations. Do one continuous beam analysis with DL and LL<=75%DL on each span. Then do one continuous beam analysis with DL on each span and LL<=75%DL on every other span. Then do some other combinations of LL patterns if you want. My guess is that none of the cases with LL patterns will create larger maximum moments or shears than the case with LL on every span. In otherwords, my guess is that when the LL is 75% or less of the DL, it becomes impossible for the "skip" patterns to "beat out" the case with LL on every span. Thus, there would be no reason to even spend the time analyzing the various cases since they will not govern. Since I have not sat down and proven this to myself with some calculations, I could be wrong. HTH, Scott Ypsilanti, MI |
- Prev by Subject: Re: Question on need to use "skip" live loads in 2-way slabs
- Next by Subject: Re: Question on need to use "skip" live loads in 2-way slabs
- Previous by thread: RE: Question on need to use "skip" live loads in 2-way slabs
- Next by thread: Re: Question on need to use "skip" live loads in 2-way slabs
- About this archive
- Messages sorted by: [Subject][Thread][Author][Date]