Wooten's third law article discussion
Wooten's third law article discussion
(OP)
I just read on article by Jim Wooten titled Wooten's Third Law & Steel Column Design from the AISC website from Modern Steel Construction 1971. It's very entertaining and Mr. Wooten brings up some very good points about the nature of steel design and how it has progressed with time, not just with the arrival of computers in structural design but with the design theory itself (elastic versus plastic design) as well as giving his opinions about the usefulness of newer design theory and analytical methods of solution.
What are your opinions about Wooten's law and the point he makes in his article concerning analysis methods and design theory? Do you agree or disagree? Why?
What are your opinions about Wooten's law and the point he makes in his article concerning analysis methods and design theory? Do you agree or disagree? Why?






RE: Wooten's third law article discussion
"Engineering is the art of modeling materials we do not wholly understand, into shapes we cannot precisely analyze, so as to withstand forces we cannot properly assess, in such a way that the public has no reason to suspect the extent of our ignorance."
- Dr. A. R. Dykes, from Desktop Engineering Magazine
The other is a fun thought experiment that illustrates how caught up we get in the formulas. Nothing has hit me so hard as when I found out how ethereal the Euler buckling equation is. Consider:
Assume we have two steel pipe columns that, when loaded axially, will fail in an elastic buckling mode. On one column, weld a plate to the top and load that plate axially while providing no moment resistance. Fill the other column with hydraulic fluid and insert a sealed plug in the end of the pipe that is allowed to move vertically, but does not allow the fluid to leak out. Load the top of the plug in the same manner that you loaded the first column. Now, let's look at the stresses in the columns at mid-height. In the first column, you'll have an axial stress equal to the load plus half of the pipe's weight divided by the pipe's area. On the second column, you'd have an axial stress from only the pipe's self weight, plus a hoop stress from the liquid pressure inside. Now, comes the key question: which pipe buckles first as you raise the load on top? The answer is neither - they buckle at the same time. The Euler buckling stress works in either case, as long as you use the total load divided by the total area of the pipe, although in one of the pipes, you would never measure that stress...
RE: Wooten's third law article discussion
RE: Wooten's third law article discussion