Wind Load on Carport

[Jerry Coombs]

I have an apartment parking cover, simple steel frames w/ metal deck. It is
20 cars. They are simple double T frames w/ purlins, etc.

How would I get the uplift loads. ASCE 7 wants Method 2, 6.5.8.2 if I read
it correctly. That's a bit extensive, I'd think.
Is there an acceptable "Rational Analysis" per 6.5.8.3 that is commonly
used?

Thanks in advance.
jdc

Jerry D. Coombs, P.E.
Coombs Engineering Services
214-287-4696

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[Drew Morris]

ASCE 7-05 has section 6.5.13 for the design of open buildings with monoslope, pitched, or troughed roofs.

[Alter Dieter]

Where and how  can one find: ASCE 7-05 has section 6.5.13 for the design of open buildings with monoslope, pitched, or troughed roofs?

 

Dieter Schmied

[Drew Morris]

ASCE 7-05 is titled "Minimum Design Loads for Buildings and Other
Structures" and is available from ASCE, the American Society of Civil
Engineers (www.asce.org). The book URL is:
https://www.asce.org/bookstore/book.cfm?book=5583

Alter Dieter wrote:
> Where and how can one find: ASCE 7-05 has section 6.5.13 for the
> design of open buildings with monoslope, pitched, or troughed roofs?
>
> Dieter Schmied
>
> ----- Original Message -----

> *From:* Drew Morris <mailto:dmo...@bbfm.com>
> *To:* sea...@seaint.org <mailto:sea...@seaint.org>
> *Sent:* Wednesday, April 08, 2009 8:23 PM
> *Subject:* Re: Wind Load on Carport

[Jeff Smith]

A while back I ran across this article, It's for the roofing association.
scroll down to the canopies section.
http://www.professionalroofing.net/article.aspx?id=1297

Scroll down to the bottom for their Roof Wind Designer. If you register,
they have an online roofwinddesigner program for roofers, but it is limited
to flat roofs, method 1, enclosed building. Not really useful for engineers,
but might provide a sanity check for certain situations.

Jeff

[Jerry Coombs]

But we still have to go through the rather involved 6.5.8.2 to get G, right?

JDC

 

Jerry D. Coombs, P.E.
Coombs Engineering Services
214-287-4696

www.coombsengineering.com

---

[Jordan Truesdell, PE]

No doubt that section was written with computers in mind; an excel form would do that math pretty quickly.  I haven't looked at it recently, so I don't know how sensitive it is to the damping coefficient. I've got a project this spring (monoslope awning on a single pole)  that will have to deal with it, and I figured I'd just run a bunch of cases with damping in the 0.1% to 0.3% range to see what the effects are.

Jordan

Jerry Coombs wrote:

But we still have to go through the rather involved 6.5.8.2 to get G, right?

JDC

 

Jerry D. Coombs, P.E.
Coombs Engineering Services
214-287-4696
www.coombsengineering.com

---

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[Teo, KP]

Jerry,

 

Although the framing is relatively light, but due to the height of the your parking structure it could still be considered rigid (frequency > 1.0), which justified using a G of 0.85 rather than going thru section 6.5.8.2.

This can be proven by creating a quick StaadPro model, applying your gravity load in the horizontal directions (X and Z) and use the command "Calculate Rayleigh Frequency".

Just my two cents on it...

 

kp

---

From: Jerry Coombs [mailto:jdc...@verizon.net]

Sent: Thursday, April 09, 2009 7:08 AM
To: sea...@seaint.org
Subject: RE: Wind Load on Carport

But we still have to go through the rather involved 6.5.8.2 to get G, right?

JDC

 

Jerry D. Coombs, P.E.
Coombs Engineering Services
214-287-4696
www.coombsengineering.com

---

From: Alter Dieter [mailto:die...@one.net]

Sent: Wednesday, April 08, 2009 8:17 PM
To: sea...@seaint.org
Subject: Re: Wind Load on Carport

 

Where and how  can one find: ASCE 7-05 has section 6.5.13 for the design of open buildings with monoslope, pitched, or troughed roofs?

 

Dieter Schmied

----- Original Message -----

From: Drew Morris

To: sea...@seaint.org

Sent: Wednesday, April 08, 2009 8:23 PM

Subject: Re: Wind Load on Carport

 

ASCE 7-05 has section 6.5.13 for the design of open buildings with monoslope, pitched, or troughed roofs.

Jerry Coombs wrote:

I have an apartment parking cover, simple steel frames w/ metal deck.  It is

20 cars.  They are simple double T frames w/ purlins, etc.

How would I get the uplift loads.  ASCE 7 wants Method 2, 6.5.8.2 if I read

it correctly.  That's a bit extensive, I'd think.

Is there an acceptable "Rational Analysis" per 6.5.8.3 that is commonly

used?

Thanks in advance.

jdc

Jerry D. Coombs, P.E.

Coombs Engineering Services

214-287-4696 

******* ****** ******* ******** ******* ******* ******* ***

[Drew Morris]

Unfortunately, that is correct.

Jerry Coombs wrote:
>
> But we still have to go through the rather involved 6.5.8.2 to get G,
> right?
>
> JDC
>
>
>
> Jerry D. Coombs, P.E.
> Coombs Engineering Services
> 214-287-4696
> www.coombsengineering.com
>

> ------------------------------------------------------------------------
>
> *From:* Alter Dieter [mailto:die...@one.net]
> *Sent:* Wednesday, April 08, 2009 8:17 PM
> *To:* sea...@seaint.org
> *Subject:* Re: Wind Load on Carport

>
>
>
> Where and how can one find: ASCE 7-05 has section 6.5.13 for the
> design of open buildings with monoslope, pitched, or troughed roofs?
>
>
>
> Dieter Schmied
>
> ----- Original Message -----
>

> *From:* Drew Morris <mailto:dmo...@bbfm.com>
>
> *To:* sea...@seaint.org <mailto:sea...@seaint.org>
>

> *Sent:* Wednesday, April 08, 2009 8:23 PM
>
> *Subject:* Re: Wind Load on Carport

>
>
>
> ASCE 7-05 has section 6.5.13 for the design of open buildings with
> monoslope, pitched, or troughed roofs.
>
> Jerry Coombs wrote:
>
> I have an apartment parking cover, simple steel frames w/ metal deck. It is
>
> 20 cars. They are simple double T frames w/ purlins, etc.
>
>
>
> How would I get the uplift loads. ASCE 7 wants Method 2, 6.5.8.2 if I read
>
> it correctly. That's a bit extensive, I'd think.
>
> Is there an acceptable "Rational Analysis" per 6.5.8.3 that is commonly
>
> used?
>
>
>
> Thanks in advance.
>
> jdc
>
>
>
> Jerry D. Coombs, P.E.
>
> Coombs Engineering Services
>
> 214-287-4696
>
>
>
>
>
>
>
> ******* ****** ******* ******** ******* ******* ******* ***
>
> * Read list FAQ at: http://www.seaint.org/list_FAQ.asp
>
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> * This email was sent to you via Structural Engineers
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