KnutS
Marine/Ocean
- Apr 21, 2008
- 6
Hi Posted this elwhere in this forum also, but seem to be a seldom visited place, anyway sorry for double posting....
I have encountered a little problem; We have 2 mm corrugated plates, width 4000 mm, height 3100 mm, width of the flat areas is approx 160 mm, depth is 60 mm, angles in the plate are 45°.
welded very (well, as solid a 2 mm plate can be welded, actually) solid in the bottom, welded also at the top, but this beam is a rectangular and have a possibillity to rotate if the cross section goes into plastic state.
Now, the load to be applied is 0,2 bar static pressure, evenly distribution.
In my opinion the problem is to determine the max stress this can take without breaking ("ALS" load) Deformation should be supposed to be ok. deformation, but not breaking.
Now the standards BS-EN 1993, eurocode 3, reduses the allovable cross section to use, resulting in a, in my opinion, very conservative way to look at this.
In my opinion, the corrugated plate can experience shear stress high enough to tear out, or; yield or
buckle in 3 horizontal areas. The buckling areas can also have some shear areas in the areas where compression occur, and tension on the oposite side. This uses all of the available area of the material in the stressed cross sections.
The first way to look at this problem, is perhaps a bit conservative, while my way to look at this is perhaps a bit aggressive. So I'd like to have your views on this problem, also links to formulas (or where to get hold of these standards) that can be used.
Any help or views are appreciated.
Regards; Knut
I have encountered a little problem; We have 2 mm corrugated plates, width 4000 mm, height 3100 mm, width of the flat areas is approx 160 mm, depth is 60 mm, angles in the plate are 45°.
welded very (well, as solid a 2 mm plate can be welded, actually) solid in the bottom, welded also at the top, but this beam is a rectangular and have a possibillity to rotate if the cross section goes into plastic state.
Now, the load to be applied is 0,2 bar static pressure, evenly distribution.
In my opinion the problem is to determine the max stress this can take without breaking ("ALS" load) Deformation should be supposed to be ok. deformation, but not breaking.
Now the standards BS-EN 1993, eurocode 3, reduses the allovable cross section to use, resulting in a, in my opinion, very conservative way to look at this.
In my opinion, the corrugated plate can experience shear stress high enough to tear out, or; yield or
buckle in 3 horizontal areas. The buckling areas can also have some shear areas in the areas where compression occur, and tension on the oposite side. This uses all of the available area of the material in the stressed cross sections.
The first way to look at this problem, is perhaps a bit conservative, while my way to look at this is perhaps a bit aggressive. So I'd like to have your views on this problem, also links to formulas (or where to get hold of these standards) that can be used.
Any help or views are appreciated.
Regards; Knut
