5003 Lectures - Faculty of Engineering and Applied Science

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E5003 - Ship Structures I 48 © C.G. Daley Draw the bonjean curve for a cross section of the wooden block at a point 15cm from the end. (show actual units). What is the block coefficient for the block? ANS: a) 171.5 N-cm (hog) b) 23.8 MPa c) Straight and then vertical d) 0.5 5.4. Consider a 100m vessel resting in sheltered fresh waters (see below). The CG of all weights fwd of midships is 23m fwd of midships (ff=23m). The CG of all weights aft of midships is 25m aft of midships (fa=25m). The weights fwd and aft are 4200 and 4600 t respectively. Two bonjean curves are given. Assume each refers to the average x-section area for 50m of ship (fore and aft). The (fore and aft) buoyancy forces act at the bonjean locations, which are 18m fwd and 20 aft (of midships). The buoyancy force aft is 4650 t. Using the bonjeans, find The vessel drafts at the two bonjeans. The buoyancy force fwd. The still-water bending moment at midships
E5003 - Ship Structures I 49 © C.G. Daley 5.5. Murray's Method Consider a 100m long vessel resting in sheltered waters. The CG of all weights fwd of midships is 20m fwd of midships (ff=20m). The CG of all weights aft of midships is 25m aft of midships (fa=25m). - Describe how you would use Murray’s Method to determine the still water bending moment for this vessel. - What other info, if any do you need? Note: you don’t need to remember the specific values for terms suggested by Murray. 5.6. Hull girder strength The hull girder can be viewed as a beam. When floating in still water, is the beam statically determinate or statically indeterminate? Provide reasons for your answer. 5.7. You see below a sketch of a ship that is 200 m long. The displacement is made up of the lightship plus the weight of cargo in two holds. The ship has stranded itself on a submerged rock. Draw the various curves of load and response for the vessel (weight, buoyancy, net load, shear, moment, slope and deflection) that are compatible with the information given. The numerical values don’t matter. The intention is to draw a set of curves that are logical for the ship as shown. 5.8. You see below a sketch of a ship that is 200 m long. The displacement is made up of the lightship plus the weight of cargo in two holds. The forward cargo hold is empty. Draw the various curves of load and response for the vessel (weight, buoyancy, net load, shear, moment, slope and deflection) that are compatible with the information given. The numerical values don’t matter. The intention is to draw a set of curves that are logical for the ship as shown. 5.9. You see below a sketch of a ship that is 200 m long. The displacement is made up of the lightship plus the weight of ballast in 4 tanks. The cargo holds are empty. Draw the various curves of load and response for the vessel (weight, buoyancy, net load, shear, moment, slope and deflection) that are compatible with the information given. The numerical values don’t matter. The intention is to draw a set of curves that are logical for the ship as shown.
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5003 Lectures - Faculty of Engineering and Applied Science

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