Examination of the intact stability and the seakeeping behaviour

3.10 Bridge height
3.10 Bridge height
The severely and fatally injured crew members mentioned in the beginning, have been on duty
on the vessel's bridge when the accident occurred. Hence the transversal accelerations aecting
a human on the bridge are calculated in the further scope of this thesis. The transversal accelerations
in seaways are calculated at one meter above the bridge deck. This value is assumed for
the vertical center of gravity of a human.
For the roll behavior of a ship in seaway it can be estimated, that its roll axis is located in
the proximity of the vessel's line of oatation according to Abdel-Maksoud [11]. This is why
the transversal accelerations are inherently higher on the bridge than on lower decks. In this
examination, the line of oatation is the ballast arrival loading condition waterline. The bridge
height above the ballast arrival waterline of the 15 vessels against L P P is shown in gure 3.4.
Actual values of examined vessels
Height of bridge above ballast
arrival waterline [m]
42,0
41,0
40,0
39,0
38,0
37,0
36,0
6
8
12
35,0
7
34,0
4
33,0
9
32,0 13
5
31,0
30,0
200 210 220 230 240 250 260 270 280 290 300 310 320 330
3
1
Lpp [m]
Actual values of examined vessels
2
14
15
11
Figure 3.4: Bridge height above ballast arrival waterline
17