5003 Lectures - Faculty of Engineering and Applied Science

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E5003 - Ship Structures I 50 © C.G. Daley 5.10. Calculate the still water bending moment (in N-cm) for the solid block of plastic sketched below. Assume the block has density as given and is floating in fresh water (density also given). Is the moment hogging or sagging? 5.11. For the example of Murray’s method in the Chapter, remove the cargo weight and add 4000 t of ballast, with a cg of 116m fwd of midship. Re-calculate the maximum sag and hog moments (both still water and wave). 5.12. For the example of Murray’s method in the Chapter, instead of using the weight locations as given, assume that the weights are distributed according to Prohaska. Re-calculate the SWBM. 5.13. Consider a 100m long tanker resting on an even keel (same draft fore and aft) in sheltered waters. The CG of all weights is at midships and is 8000 tonnes. Use Murray’s Method and Prohaska’s values to determine the still water bending moment for this vessel (i.e. get both the weight and buoyancy BMs about midships).
E5003 - Ship Structures I 51 © C.G. Daley Topic 6: Longitudinal Strength: Wave Bending Moments Introduction In this Chapter we will • Discuss the shape of ocean design waves • The moments caused by waves ~~~~~~~~~~~~~~~~~~~~ Design Waves Cape Spear Design wave forces are considered to be quasi-static. As a wave passes by a vessel, the worst hogging moment will occur when the midbody is on the crest of a wave and the bow and stern are in the troughs. The worst sagging moment will happen when the bow and stern are on two crests, with the midbody in the trough between. Whether for sagging or hogging, the worst condition will occur when the wavelength is close to the vessel length. If the waves are much shorter,
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Lecture Notes for Engineering 5003
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5003 Lectures - Faculty of Engineering and Applied Science

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