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Re: KISS Method for Bracing Connection Design
- To: seaint(--nospam--at)seaint.org
- Subject: Re: KISS Method for Bracing Connection Design
- From: Mlcse(--nospam--at)aol.com
- Date: Thu, 2 Feb 2006 17:23:52 EST
The Keep It Simple Stupid (KISS) method can be used you just have make sure you comply with the requirements of the building code regarding the connection design and any eccentricities that result from the connection configuration and the work points of the members. The UFM is just a method of analysis where you have balanced forces and no additional moments added to the connection if you have the appropriate connection configuration. If you modify the member orientation/shape of gusset plate of the connection using the UFM you may have additional moments that have to be addressed. The UFM does have special cases to address the additional moments caused by eccentricity.
Mike Cochran S.E. SECB
In a message dated 2/2/2006 1:47:32 PM Pacific Standard Time, tripphoward(--nospam--at)yahoo.com writes:
I got a direct response from someone with another article by Thornton. It basically seems to say KISS is ok but UFM is more economical. It also makes no mention of creating additional loads on the beam or column when using KISS. So, unless there is some code or FEMA reference I'm unaware of that says something to the effect of "KISS method shall not be used in concentric braced frame connections", I'm inclined to accept it. Anyone see any other issues I'm missing?
----- Original Message ----
Sent: Thursday, February 02, 2006 3:37:42 PM
Subject: Re: KISS Method for Bracing Connection Design
You might want to check the Structural Steel Education Councils website (http://www.steeltips.org/
) where you can purchase some of their steel tips related to brace frame design (I believe they are a very reasonable cost). You might check with AISC, they had a road show last year on Steel Concentric Braced Frames which was very good and you might be able to get notes from the seminars.
Michael Cochran S.E. SECB
In a message dated 2/2/2006 12:31:12 PM Pacific Standard Time, tripphoward(--nospam--at)yahoo.com writes:
Does anyone know where I can get some information on the design of braced frame connections using the KISS method? The only thing I've been able to locate is an article by Willam Thornton titled "Seismic Design of Connections in Concentrically Braced Frames". It's basically an article about the UFM but it has a little blurb about the KISS method being safe and more conservative. It also has free body diagram of the forces on the gusset plate using the KISS method.
What I'd really like to know is if this method imparts any additional forces or moments on the beam and column? Also, does anyone know if there is anything that would prevent this being used for seismic loads in a concetrically braced frame?
Tommy "Tripp" Howard, P.E.