Résumé:
"The major concern of conceptions in civil engineering is to deliver reliable structures
(secured) and made with the least possible cost (economy). Furthermore, the development of
new materials such as concrete sand necessitates conceptions and an increased knowledge of
the material as a material to compare with ordinary concrete and metal frame and also
requires further study when it is used as structural element (presence of reinforcement).
Three structural elements having the same plastic moment, Mp, submitted to the same load
and with the same support conditions have the same theoretical collapse load. The fact that
the range of profiles in metal frame is made in factory, and that their plastic modules and of
this fact their plastic moments are directly given, and tabulated, it is possible to characterize
usual sections of ORC* and RSC* having the same plastic moment as that of the range of
different profiles ‘IPE’, hence the same theoretical collapse load.
The Characterization can be facilitated by the development of charts at three entries. Linking
graphically the reduced moment, Mu/bd² and the rate of reinforcement in tension, ρ, and in
compression, ρ', by using the characteristics of the materials adopted by the Eurocode 2 [1],
and the British code CP110 [3].
A comparison between the charts developed as well as results obtained by the characterization
for different values of the parameters (fck, fyk, ORC*/RSC* EC2/CP110) is also presented."
