Base plate stiffness

[TheMoonlitKnight]

Is anybody aware of a US publication that has rotational stiffness criteria for base plate connections? Seems like a collaboration between AISC and ACI would be most appropriate...

 

[SteelPE]

Check out the PCI. If I remember correctly, they go through a whole example.... at leat they did in my 5th edition.

 

[TheMoonlitKnight]

Hmmmm...PCI. I wouldn't have thought that. Thanks!

 

[SteelPE]

That is the only place I have seen a complete procedure. It takes into account footing stiffness, bolt elongation and base plate stiffness. To tell you the truth, I wrote a spreadsheet that runs through the numbers for me and I don't necessarily like the numbers I get out on the other side (seems too stiff for me). I usually do everything I can to use a pinned base. However, in accordance with an AISC seminar I went to about 10 years ago, I will use 10% of the fully fixed case for a pinned base or 0.4EI/L which is based upon the old column K charts (using 10 for pinned instead of infinity).

 

[TheMoonlitKnight]

I had a brief moment to look through the latest PCI manual and didn't see it, but I will try to find the edition you mention.

I just find it odd how so many 1 and 2-story building steel frames are built to be essentially theoretically unstable - all joints being nominally pinned. Guess that's what shear walls are for...

 

[SteelPE]

I attached the information I have on the subject.

I don't think I have ever seen a structure you have described. I have work with and for fabricators for 14 years and I have always been able to figure out how the LFRS of a structure. I don't know where you are located but I would be surprised if structures like this are being constructed in the US.

 

[rowingengineer]

why only interested in American publications? Generally there are many codes that are far more developed in the semi-rigided design than the American.

http://www.nceng.com.au/

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

 

[TheMoonlitKnight]

SteelPE: I don't think I expressed that properly. I was trying to differentiate between nominally pinned and the actual conditions. Thanks a bunch for the pdf!

rowing: I wanted to start with US publications firstly. I am open to others too.

 

[slickdeals]

You can start by watching this seminar

http://www.aisc.org/content.aspx?id=19858

 

[johnbridge231]

Can anyone provide information on the rotational stiffness of base plate connections under biaxial bending?

Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis

http://www.engissol.com/cross-section-analysis-design.html

 

[TheMoonlitKnight]

Thanks, slick.

 

[TheMoonlitKnight]

Slick, that was a great presentation.