Reference no: EM132532814 , Length: word count:2500
For the midship-frame of the ship given in Part (A),calculate the thickness of plates and section modulus of the stiffeners, web frames and girders. For these calculations, you can refer to "Steel vessels under 90m in length" rules accessible from ABC website
1. Draw a midship frame to include plates, stiffeners, webframes and girders for the bottom shell, double bottom, side and deck plating.
2. Determine the followings, when the ship is subject to a sagging moment of 80 MNn:
a) the bending stress at the upper deck edge and lower chine when the vessel heels 15°;
b) the angle of heel for which the bending stress is maximum;
c) the maximum bending stress occurring in part (b);
d) the inclination of the neutral axis at the angle of maximum bending stress.
Guidance to Students:
1. Set up a spreadsheet to perform scantling (structural calculation) for the midship frame
2. Prepare a report for the scantling with reference to the sections and equations from the rules, which have been extracted.
3. Perfome the scantling for bottom, double bottom (inner bottom), side and deck
4. Specify the thickness and section modulus of the plates, frames (stiffeners), webframes and girders.
5. Provide a midship frame drawing with sufficient texts and dimensions. You may draw a half of the midship frame since it would be symmetrical.
6. The following assumptions should be considered:
a) The position of double bottom should be determined by ABS rule.
b) Use Longitudinal frame spacing for the bottom, double bottom, side and deck.
c) The Frame spacing in bottom, side and deck is 600 mm.
d) The Webframe spacing in bottom, side and deck is 2400 mm.
e) The distance of midship frame from the next and previous bulkheads is 4800 mm
f) Maximum five girders could be set for bottom and deck
Interpretation Required of Students:
Given that the midship-frame being designed is subject to maximum bending stress, what limitations would you have suggested for the maximum permanent deflection or any other aspect of the structural design and reasons why?
Attachment:- midship frame.zip
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