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 Boat Design Forums Transverse frame calculation

#1
04-30-2012, 03:17 PM
 DUCRUY Jacques Junior Member Join Date: Nov 2009 Rep: 15 Posts: 75 Location: france
Transverse frame calculation

Hello,

Can I submit you an example of calculation for a transverse frame for a sailboat with ISO 12215-5 ?

The boat had a Lwl of 9 m and a displacement of 6500 Kg, built in steel. The frame space is 0.60 m : I assume (see sketch under) that l = 2.20 m, c > 0.18 l and that the point "P" is under the waterline.

I take the minimum bottom pressure (0.35 Disp^0.33 + 1.4 Lwl = 19.13 kN/m˛. The allowable stress is : 235 * 0.8 = 188 N/mm˛. The curvature factor is 0.5 (as c > 0.18 l).

SM = ((83.33 * 0.6 * 2.2˛ * 19.13)/188) * 0.5 = 12.35 cm^3

Is my reasoning correct ?

Best Regards

Jacques
Attached Thumbnails

#2
05-02-2012, 05:38 PM
 TANSL Senior Member Join Date: Sep 2011 Rep: 248 Posts: 2,856 Location: Spain
That is what I get with my program SCT.
Best Regards
Ignacio López
Attached Files
 Ducruy-1.doc (83.5 KB, 227 views)
#3
05-03-2012, 03:12 AM
 DUCRUY Jacques Junior Member Join Date: Nov 2009 Rep: 15 Posts: 75 Location: france
Hello Ignacio,

In fact, in my question, I had supposed that the crown stiffener is 18 % of the unsupported length, so the Kcs is 0.5. If I correct your figure for frame SM (19.96 * (0.5/0.827), we are agree.

But how do you calculate the base bottom pressure of 31.8 kN/m˛ ?

Best Regards

Jacques
#4
05-03-2012, 04:25 AM
 TANSL Senior Member Join Date: Sep 2011 Rep: 248 Posts: 2,856 Location: Spain
Yu are right, Jacques.
See new file "Ducruy-1.doc", in previous post.
B.R
#5
05-03-2012, 01:47 PM
 DUCRUY Jacques Junior Member Join Date: Nov 2009 Rep: 15 Posts: 75 Location: france
Thank you very much

BR

Jacques

#6
05-05-2012, 04:14 PM
 heart91 Join Date: May 2012 Rep: 10 Posts: 1 Location: Malaysia
I am new to design.
How can i learn to read rule Llyod's for what is meaning between 2,5H and 7,5H????
Can somebody help me.

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