If and when we go metric in steel design i am sure the industry will work through some of these problems. --
"Go for a Metric America" Howard Ressel Project Design Engineer, Region 4 (585) 272-3372 >>> On 2/4/2009 at 3:50 PM, in message <[email protected]>, Pierre Abbat <[email protected]> wrote: > On Wednesday 04 February 2009 14:54:24 Howard Ressel wrote: >> This was a bit back but i received a response from a structural engineer >> friend of mine and he tends to agree. >> -- >> >> "Go for a Metric America" >> Howard Ressel >> Project Design Engineer, Region 4 >> (585) 272-3372 >> >> >> >> >> I would agree that designing steel in metric is not as user friendly. >> The steel section properties are typically mm2, mm3 or mm4 and are >> very >> large numbers. For example the area of a W36x230 beam shape is 68 in2 >> or 43600 mm2. Similarly, the bending section modulus is 837 in3 or >> 13700000 mm3. The larger values are not that easy to work with. > > For the bending section modulus, we can say it's 13.7 liters, even though > it's > not a volume. The second moment of area is on the order of millions of > quartic millimeters, and since there's a 10^12 ratio between the quartic > millimeter and the quartic meter and powers of 10 that aren't powers of 1000 > > are avoided, the numbers are unwieldy. I think the solution is to give a > name > to the quartic meter, even though I know of no other use for it, so that the > > prefix "micro" can be attached to it. > > Pierre
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