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Re: Moment Frame Algorithms??[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Moment Frame Algorithms??
- From: LibertyEng(--nospam--at)aol.com
- Date: Sat, 21 Aug 1999 15:13:20 EDT
In a message dated 8/20/99 20:40:19 Eastern Daylight Time, Bill(--nospam--at)AllenDesigns.com writes: > I intend this spreadsheet to design the connections, > pad footings and grade beam in one operation. > Bill is onto something good here. One suggestion in lieu of moment distribution would be to use the stiffness method. If you have a single bay single story frame with fixed column bases you only need to set up a solution to a six equations and six unknowns; (bases hinged it expands to 8x8). It would also lend itself well to a sloping beam and/or foundations at different elevations. The result would give you all the member end forces so you could finish it off with calcs for your favorite connections. I'm looking at some homework assignments from my master's program where we went through a single bay structure with x bracing for various loading and support conditions. (Joint loads, distributed loads, Hinged joints, moment connected joints, support settled, etc.) Without the cross bracing the matrix would be pretty sparse. I did all the matrix construction and manipulation with VP-Planner (1989). I also found some disks but they are 5-1/4" and here at the office there aren't any 5-1/4 drives!! Have to check them at the house. Bill's on the right track with a homegrown solution to problem that you need to solve often. Commercial software can be a great help but sometimes it doesn't get you all the way through the design process in the manner you'd like. You end up working in fits and starts, trying to plug results from analysis software into design details. Your own solution can be as seamless as you want to it to be, if you're willing to invest the time and effort. Jan Harris, PE Liberty Engineering, PC Virginia Beach, VA
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