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RE: ACI318-99 load combination question

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What exactly would the seismic effects be on the fluid? There is the
static effects on basement walls and hydrostatic uplift. But I think the
geotechnical engineer would give you the seismic effects indirectly with
some coefficient on the static effects? 


On Wed, 23 Aug 2000, Lutz,James wrote:


> ...seismic loads are involved. If you do have fluid loadings, don't
forget
> seismic effects on the fluid, which are part of the E loads. 
> 
> -----Original Message-----
> From: Zachary Goswick [mailto:ZachG(--nospam--at)angusyoung.com]
> Sent: Wednesday, August 23, 2000 2:57 PM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: ACI318-99 load combination question
> 
> 
> 
> Does anybody know whether equation 9-6 "U=1.4(D+T)" or the commentary on the
> same section saying equation 9-6 is "U=1.05(D+T)" is correct?  It appears to
> me that they are saying two different things, or am I not seeing this
> correctly?
> 
> Also, I am looking at section 9.2.5 and reading that 1.4F should be added to
> ALL combinations that have live load in them.  The commentary says use just
> two equations "U = 1.4D + 1.7L + 1.4F" and "U = 0.9D + 1.4F".  This does not
> seem to me to be ALL of the combinations with live load in them.  Wouldn't
> this be all of the combinations given in paragraphs 9.2.1 through 9.2.7. as
> follows?
> 
> U = 1.4D + 1.7L + 1.4F                          - from equation 9-1 
> U = 0.75(1.4D + 1.7L + 1.7W) + 1.4F             - from equation 9-2 
> U = 0.75(1.4D + 1.7L + 1.7(1.1E)) + 1.4F        - from paragraph 9.2.3 
> U = 1.4D + 1.7L + 1.7H + 1.4F                   - from equation 9-4 
> U = 0.75(1.4D + 1.7T + 1.7L) + 1.4F             - from equation 9-5 
> 
> It appears as if the second equation given by the commentary would not even
> be included in what the actual code says.  Am I reading this incorrectly?
> Can anybody shed some light on these issues?  
> 
> I can figure out what would be the worst cases, but I am just trying to
> clarify what the code actually says.  Please help!
> 
> 
> Zachary Goswick 
> zachg(--nospam--at)angusyoung.com 
> 
> 
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