I am using a W27x146 for a tall column. It's web is slender for compression. However, when I go through section E7 of the AISC manual, I find that there is no reduction (Qa=1). E7.2 is kind of confusing since they don't tell you what to do when b/t is less than 1.49x(E/f)^0.5. Am I missing...
I'm running into a problem with a moment connection and I was wondering if anybody could shed some light. I have a W18x119 beam (25'long) framing into a W18x143 column. It's designed to be an OMF. These sizes were picked to meet drift. I want to use a bolted connection to avoid alot of full pen...
This question is for anybody that is familiar with the massachusetts state building code. It does not appear that the current edition allows you to take R=3 for steel design of buildings. So you would need to design and detail all buildings to meet AISC seismic requirements even if they fall...
Given a spread footing and a soil subgrade reaction modulus, does anybody know how to calculate the amount of rotation (degrees) a footing will rotate under a moment reaction from a fixed column base plate?
I'm designing a mechanical platform sitting on top of a roof. It's in seismic design category D. I was planning to use kickers to transfer the lateral load down to the roof diaphragm. Are these kickers considered an eccentrically braced frame and do they have to be designed and detailed as...
Hi. I am designing a fairly large elevated platform to support heavy mechanical equipment. The platform falls into design category D. Because the platform is less than 35' tall, I am using ordinary concentrically braced frames for vertical bracing. However, the platform does not really have a...
