lateral deflection portal frame

[rittz]

Can someone give me a formula to calculate (or estimate) the lateral deflection in a fixed base portal frame. I col and I beam are the same. Thanks for your help.
J

 

[rb1957]

a google for "portal frame analysis" gave lots of relevant looking hits ...

Quando Omni Flunkus Moritati

 

[msquared48]

I believe Seeyle has a lot of different frame examples with a lot of equations too.

But you can also try "Rigid Frame Formulas" by Kleinlogel - one of the classics. You probably want frame #41.

Mike McCann
MMC Engineering

 

[Hokie93]

If you have a single bay, fixed-base frame with a horizontal girder loaded laterally at the top of the column, then another source is the April 1993 issue of Modern Steel Construction magazine, in the Steel Interchange article. The article is available (free of charge) from the Modern Steel Construction website (

http://www.modernsteel.com)

via the "Back Issue Archives" tab in the upper right hand corner.

You can arrive at the same result using Kleinlogel but it will take several pages of computation as Kleinlogel does not directly provide the equations for drift/deflection.

 

[rittz]

hi mike What is eeyle. A BOOK
Thanks to you

J

 

[civeng80]

From my recollection Kleinlogel has only BM and reactions , no deflection equations.
rittz are you designing by hand ? or using software ?

 

[rittz]

Civeng80 Thanks for the response
Designing by hand and excel .. that's it

J

 

[SAIL3]

It is very difficult to achieve a truly fixed base in reality.....

 

[IceNine]

It is also very unlikely for a building to be exposed to the full code prescribed lateral loads, which makes me feel comfortable assuming a fixed base on occasion.

 

[IceNine]

It is also very unlikely for a building to be exposed to the full code prescribed lateral loads, which makes me feel comfortable assuming a fixed base on occasion.

 

[Jerehmy]

IceNine

If you're worried about deflection, they're service level loads anyways. So your structure will most likely see these loads.

 

[rittz]

Kokoe93

Thanks for the tip. It looks ok for my application

J

 

[rb1957]

btw, "lateral" is in-plane, right ? the way the frame displaces to the side under a side-acting load, and not lateral as out-of-plane ?

Quando Omni Flunkus Moritati

 

[civeng80]

Hokie, downloaded the paper, and its very handy.
Not that I design portal frames by hand but still very good.

 

[msquared48]

civeng80:

You were right about Kleinlogle - no deflection formulas, and the same applies to the book by Seelye ("Data Book For Civil Engineers - Design", 1964 by John Wiley & Sons). Sorry for that.

That being said, they are still excellent references to obtain for your library.

Mike McCann
MMC Engineering

 

[WillisV]

A more thorough treatment, including pitched frames, can be found here:

http://www.structuremag.org/article.aspx?articleID=736

 

[saruncivil]

Dear Engineers

can anyone please send me the pdf file of the "Rigid Frame Formulas" by Kleinlogel book.
im buddy engineer. wanna learn more please help me...
pls send me the pdf file to thi mail id saruncivil@gmail.com