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# Re: Differential temperature effect

• To: <seaint(--nospam--at)seaint.org>
• Subject: Re: Differential temperature effect
• From: "Arturo Martinez" <amartine(--nospam--at)udep.edu.pe>
• Date: Thu, 27 Feb 2003 14:30:36 +0100

```Bulent:

I have tried this before for a concrete bridge deck. I think you have to use
both options given in SAP2000. The first one (uniform temperature t) will be
the temperature at mid-depth and the second one (gradient t) is the
temperature gradient per unit depth. (i.e. DeltaT/H). Refer to SAP2000
documentation for sign conventions.
The results I got were "exact" (compared to textbooks) for frame elements.
For FE I had to refine the mesh to get results close to the "exact" one.
Greetings,

Arturo Martínez
Piura, Peru

----- Original Message -----
From: "Bulent Deveci" <bulentdeveci(--nospam--at)superonline.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, February 27, 2003 6:51 PM
Subject: Re: Differential temperature effect

> Lutz,
> In ACI 313 clause 4.4.9 states that :
> The thermal effects of hot stored materails shall be considered for
circular
> walls or wall areas with total restraint to warping (as at corners of
> rectangular silos), the thermal bending moment per unit of wall height or
> width shall be computed by
> Mt = Ec*h2*alfa*DeltaT / 12(1-poission)
> This is the same formula given by Timoshenko.
>
> But as for Sap2000, there are two options. One "temperature t" which is
> constant through the thickness and produces mambrane strains
> The second, "temperature gradient t3" which is lineer in the thickness
> direction and produces bending strains.
> It is obvious that I have to use the second option. But unfortunately, my
> results are very far from those I've obtained from the above given
formula.
>
>
>
>
>
> ----- Original Message -----
> From: "Lutz, James" <James.Lutz(--nospam--at)earthtech.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Thursday, February 27, 2003 7:17 PM
> Subject: RE: Differential temperature effect
>
>
> > I haven't done it, but it looks like it is possible. It wasn't clear if
> you
> > are just modeling a frame or if there are plate elements involved, but I
> > think it will handle it either way. It's a pretty powerful program (once
> you
> > figure it out.)
> >
> > I think you may have to create a batch input file since the graphical
> users
> > interface is limited to more routine kinds of problems as far as data
> entry
> > goes. If you have already created a basic model using the GUI, you can
> dump
> > it into a text file and edit it to get the stuff you need in there.
CSI's
> > manuals aren't the greatest for figuring this stuff out. Good luck.
> >
> > -----Original Message-----
> > From: Bulent Deveci [mailto:bulentdeveci(--nospam--at)superonline.com]
> > Sent: Thursday, February 27, 2003 8:26 AM
> > To: seaint(--nospam--at)seaint.org
> > Subject: Differential temperature effect
> >
> >
> > List,
> > Does anyone of you have any experience in designing a reinforced
concrete
> > structure
> > having differential thermal conditions with SAP2000 software? I'm just
> > trying to design a complicated RC structure with nearly 300 C
differential
> > temperature and I don't have the chance of insulating it due to the
> process
> > of the structure.
> > I have tried to obtain the bending moments by means of SAP2000 software
> but
> > I'm not able to satisfy the results given in some text books such as
> "theory
> > of elasticity" by Timoshenko.
> >
> > Any comment would be appreciated.
> >
> > Bulent Deveci
> >
> >
> >
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