I cannot find a definition of "Concentrated Force" in AISC. Does anyone know is AISC has defined a bearing length limit for a force to be considered concentrated. I wonder specifically with regard to web buckling. Checks for web local yielding, local crippling, and sidesway buckling all account for the length of bearing. Web bucking strength is independent of bearing length, so I'm wondering at what length is a force no longer considered concentrated? And, why isn't the bearing length considered for Web Compression Buckling?
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