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RE: ACI318-99 load combination question

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Michael Bryson

     If the structure is like a tank filled with fluid I would suggest 
looking at Housedress paper " Dynamic Pressures on Accelerated Fluid 
Containers".

Acie Chance
-----Original Message-----
From:	Michael Bryson [SMTP:bryson(--nospam--at)civil.ubc.ca]
Sent:	Thursday, August 24, 2000 8:32 AM
To:	seaint(--nospam--at)seaint.org
Subject:	RE: ACI318-99 load combination question


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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