Kiss method8/9/2023 With fewer distractions, choices, and clutter, we can’t help but go from A to B more efficiently. The simpler something is, the easier it is to use. The KISS principle - Keep It Short and Simple or Keep it Simple and Straightforward for those who don’t like the ‘stupid’ part - has since been adopted by anyone who needs to relay information quickly and effectively - from military personnel to journalists and designers. “Make everything as simple as possible, but not simpler” -Albert Einstein (paraphrased) And when you’re in the military, it’s incredibly important to send and process information quickly and without ambiguity. Unnecessary complexity gets in the way of purpose and should be avoided at all times. The idea behind it is that most processes or systems work best if they’re kept simple. The first one is going to be more conservative, but I tend to think that the 2nd one is closer to what I've seen before.There’s a saying the US Navy coined in the ’60s: “Keep It Simple, Stupid” - or KISS for short. I don't see a reference for exactly how this should be done. I just look at the nominal moment capacity as the moment that will cause yield (or rupture) in the extreme fiber of the weld is that were the only force applied to the weld.Į) Lastly, you might want to do some kind of code check that checks the connection for Shear + Moment interaction. This is V*(dc/2) for the vertical force in the column to gusset weld, and H*(db/2) for the horizontal force in the beam to gusset connection.ĭ)Then you just need to determine the capacity of the weld to resist that moment. Per your image, it is equal to the shear force in that connection time the eccentricity between the working point of the connection and the location of the connection. And, this demand vs capacity is checked with a pure shear check on the beam to gusset weld (or bolts).Ĭ) However, there is moment in each of these that needs to also be checked. Similarly, there is ZERO axial force in this connection. This is checked with a pure shear check on the column to gusset weld (or bolts).ī) The horizontal portions of the brace force goes entirely into the beam to gusset connection. But, there is ZERO axial force in the column to gusset connection. RE: KISS Method for Gusset Plate Samm圓45 (Structural)Ī) The vertical portion of the brace force goes completely into the column to gusset connection. It's the opposite of the mechanism method that is used in yield line analysis. If you can find an older textbook that includes plastic analysis or plastic design, look for the "statical method." It's the same thing. In other words, you're either conservative or correct. In a nutshell, if you can identify a statically admissible set of forces, the brace force that causes these is the ultimate strength, which we'll call Rn for this subject, or an underestimate. The KISS Method, like all of the common methods for assigning these forces, is based on the lower bound theorem of plastic analysis, which is also described at the start of Chapter 4. Design Guide 29 has many examples of the UFM. When you get the forces between the gusset and beam and column, the limit state checks are the same as when you're using the Uniform Force Method. I am not aware of any example problems for this, but the distribution is so simple that the explanation in Section 4.1 is probably sufficient. The AISC Design Guide 29, Section 4.1 describes the KISS Method.
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