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Gr goire
DOLTO |
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| Responsable technique |
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| Port de Javel Haut 75015 Paris |
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| Tl
01 44 37 04 05 |
Portable 06 08 22 26 62 |
| Fax 01 45 77 21 88 |
email dolto@France-nautic.com |
|
Paris 2002-05-13
EXPLANATION OF PLATING ANALYSIS EXCEL FILE
Calculation of thickness (column O lines 10 to 15)
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Second part of the spread sheet.
Column B lines 22 to 27 repeats the data of lines 10 to 15
Column C lines 22 to 27 calculates the Ygi =Y of centre of gravity of each layer = Σ(t0 to ti)- ti/2
The overall Yg = Σ(Sei*Ygi)/Σ(Sei) (SEi Ygi) is in column D lines 22 to 27 and Σ(Sei) in column N line 17
Column D lines 22 to 27 calculates the product of Sei*Ygi for each layer
Column E lines 22 to 27
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Column F lines 22 to 27 calculates Vi for each layer : if Ygi < Yg = Vi = Ygi-Yg-ti/2 otherwise Yg-Yi+ti/2
Column G lines 22 to 27 calculates Zi EI(Vi Ei) line 29 gives Zi min = min of absolute values of Zi.
Column H lines 22 to 27 calculates σi = Mfu/Zi = bending stress (-if compressive, + if tensile)
Column I lines 22 to 27 calculates the safety factor σa/σi line 29 gives the worst case OK if Fs ≥ 1
Column J and K lines 22 to 27 calculates ultimate and allowable bending moment = Zi σu or Zi σa
Column L lines 22 to 27 calculates SEiWi= SEi(Ygi-Yg)
Column M lines 22 to 27 calculates ΣSeiWi from layer 1 to layer i
Column N lines 22 to 27
Column O lines 22 to 27 calculates Fsτ= τa/τreq and the min abs value in column 29
EXP-PL~1.DOC
Annex - ?
Geometric Properties of Stiffeners
1. METALS
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2. WOOD
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2. WOOD (contd)
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Comparison between pre-Baltimore Kar factor and Baltimore decision (Kar = (1,2-b/1000) LWL 0.5/5)
| LWL |
Old Kar |
Baltimore |
S(mm) |
| 250 |
| U |
| 6 |
0.592 |
0.465 |
2.30 |
| 9 |
0.701 |
0.570 |
1.23 |
| 12 |
0.765 |
0.658 |
0.84 |
| 15 |
0.804 |
0.736 |
0.65 |
| 18 |
0.828 |
0.806 |
0.55 |
| 21 |
0.841 |
0.871 |
0.50 |
| 24 |
0.845 |
0.931 |
0.49 |
|
| LWL |
Old Kar |
Baltimore |
S(mm) |
| 500 |
| U |
| 6 |
0.372 |
0.343 |
9.19 |
| 9 |
0.462 |
0.420 |
4.94 |
| 12 |
0.526 |
0.485 |
3.36 |
| 15 |
0.570 |
0.542 |
2.61 |
| 18 |
0.599 |
0.594 |
2.21 |
| 21 |
0.616 |
0.642 |
2.01 |
| 24 |
0.622 |
0.686 |
1.95 |
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| LWL |
Old Kar |
Baltimore |
S(mm) |
| 750 |
| U |
| 6 |
0.283 |
0.220 |
20.69 |
| 9 |
0.348 |
0.270 |
11.11 |
| 12 |
0.398 |
0.312 |
7.56 |
| 15 |
0.435 |
0.349 |
5.87 |
| 18 |
0.461 |
0.382 |
4.98 |
| 21 |
0.476 |
0.412 |
4.53 |
| 24 |
0.482 |
0.441 |
4.38 |
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| LWL |
Old Kar |
Baltimore |
S(mm) |
| 1000 |
| U |
| 6 |
0.238 |
0.098 |
36.78 |
| 9 |
0.287 |
0.120 |
19.75 |
| 12 |
0.326 |
0.139 |
13.43 |
| 15 |
0.356 |
0.155 |
10.43 |
| 18 |
0.377 |
0.170 |
8.86 |
| 21 |
0.390 |
0.183 |
8.06 |
| 24 |
0.394 |
0.196 |
7.79 |
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