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Replace a W-Girder with a Joist-Girder 4
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JAE,
Thanks. You are right. I didn't provide enough information. I will give you some details:
What I would like to do is to use Joist Girders instead of W Girders to make the frames I design more economical. I start doing some research and I saw this information about TECHNICAL DIGEST #11 - DESIGN OF JOIST GIRDER FRAMES (July 1999), "Joist Girders provide an economic structure you may not know of the added economy afforded through the use of the Joist Girder/Rigid Frame concept."
But I have some doubts even before I start using them and the reason is this:
I tried before to use Cellular Beams instead of regular W Beams for the rigid frames the company I work for is designing, but talking to a the Midwest Regional Manager of
CMC Steel Products he discouraged me, saying that his company is not interested in providing small amounts of Cellular Beams. They now have a lot of work for areas like
Las Vegas, to give me an example.
My question is: from your experience what should I do succeed this time in my attempt to replace the heavy W Girders with Joist Girders?
Thanks. You are right. I didn't provide enough information. I will give you some details:
What I would like to do is to use Joist Girders instead of W Girders to make the frames I design more economical. I start doing some research and I saw this information about TECHNICAL DIGEST #11 - DESIGN OF JOIST GIRDER FRAMES (July 1999), "Joist Girders provide an economic structure you may not know of the added economy afforded through the use of the Joist Girder/Rigid Frame concept."
But I have some doubts even before I start using them and the reason is this:
I tried before to use Cellular Beams instead of regular W Beams for the rigid frames the company I work for is designing, but talking to a the Midwest Regional Manager of
CMC Steel Products he discouraged me, saying that his company is not interested in providing small amounts of Cellular Beams. They now have a lot of work for areas like
Las Vegas, to give me an example.
My question is: from your experience what should I do succeed this time in my attempt to replace the heavy W Girders with Joist Girders?
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Most of the Wal-Marts, Lowes, Home-Depot, etc. in my area use joist girders...
As EOR you will need to do your homework on providing the right info to the joist manufacturer and coordinating details.
This Vulcraft catalog might give you some useful information to start with; see p 78:
As EOR you will need to do your homework on providing the right info to the joist manufacturer and coordinating details.
This Vulcraft catalog might give you some useful information to start with; see p 78:
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I looked thru the vulcraft joisy girder manual. They only
show gravity loads. Doesnot meen that joist have no axial capacity. But I will like to see how joist manufacturer being designer too handles this. By the way RICI, economy of joist sometime cause vibration problems.
show gravity loads. Doesnot meen that joist have no axial capacity. But I will like to see how joist manufacturer being designer too handles this. By the way RICI, economy of joist sometime cause vibration problems.
Check out this publication:
"Designing with Steel Joists, Joist Girders, and Steel Deck"
Click on the link in that page just above the title of the publication I referenced. It is not expensive and provides some details and design guidelines for using joists and joist girders in moment-resisting frames.
You may also check out the Steel Joist Institute Catalog for additional information or requirements.
"Designing with Steel Joists, Joist Girders, and Steel Deck"
Click on the link in that page just above the title of the publication I referenced. It is not expensive and provides some details and design guidelines for using joists and joist girders in moment-resisting frames.
You may also check out the Steel Joist Institute Catalog for additional information or requirements.
civilperson
Structural
The economy of joist girders needs to include the components of walls/stairs/columns since the increase in depth over rolled shapes, (which causes the economy in weight), also causes a increase in floor to floor height or floor to roof height.
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dgkhan,
If I will use the Steel Joist only as a Roof Girder,
I hope that the vibration is not a problem anymore.
UcfSe,
Thanks. I will check out "Designing with Steel Joists, Joist Girders, and Steel Deck"
Civilperson,
Yes. The increase in depth is an issue. Thanks.
If I will use the Steel Joist only as a Roof Girder,
I hope that the vibration is not a problem anymore.
UcfSe,
Thanks. I will check out "Designing with Steel Joists, Joist Girders, and Steel Deck"
Civilperson,
Yes. The increase in depth is an issue. Thanks.
Agreed, the Vulcraft tables are only for gravity loads. But starting on page 78 they discuss their process for providing Moment Resistant Frames. As I said before, using joist girders in a moment frame will require some homework to perform a lateral analysis. If you can, contact a joist manufacturer and they may be able to provide you with some preliminary member properties for use in a frame analysis.
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