A review in steel design codes of USA and CANADA shown that both codes propose a capacity for beams which is more than 30 percent in error (more than actual)! what is your idea?
I clearly don't understand what is it that you found.
but as what i understood from the question, my answer is, US and Canada are known from extreme weather conditions (heavy winds high expansion and compression ratio and tornadoes) so the structural designs are made such that the structure can hold 30% more than design requirement.
Hi
Please refer to the Galambos & Survek (Book), Structural Stability of Steel, John Wiley &Sons , 2008.
On page 286, they presented the nominal strength of a W27x84, Fy=50 ksi ... according to different codes as follows.
Country Strength in-kips Stress ksi
USA 9,500 44.6
Canada 10, 430 49.0
Australia 7,630 35.8
Europe 7,610 35.7
The capacity by the first two codes are higher than the actual nominal strengths. The results are not on the safe side!
My research team developed an exact solution which is in comply with EU and AUS.
We are not in 2008, any research or books older than 10 years are not used for practical purpose in US they keep updating. So I think you may have to update yourself, if you want I can send you the latest construction specifications that are followed and references (books) IBC code and stuffs.
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