Hello
If you look at the H+H and YTONG documents for reinforcement of U-beams over openings, there is a very large difference, I think. Can anyone here explain why there is such a big difference?
Example:
H+H
http://ipaper.ipapercms.dk/HH/HHSverige/DownloadsSE/HHBalkar/HHUblocket525/
With 2 pieces of 12mm reinforcement bars at the bottom of any U-beam, H+H indicates that the load at "Serviceability limit state. Long-term deformation. Quasi-permanent load combination. Creep factor = 3" is 9.1kN/m
For almost the same size 240x250 beam from YTONG's reinforcement table, 4 pieces of 12mm reinforcement bars with stirrups are used, but YTONG then considers the max load to be barely 5kN/m. See page 5 in
https://www.xella.se/se/docs/U-BALK_ARMERINGSTABELL.pdf
What makes H+H seem to be about twice as strong despite less reinforcement? Or am I comparing apples with oranges?
