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Q9. A ballast tank watertight bulkhead 6.0 m deep is stiffened by vertical angle bar stiffeners 255 mm x 100 mm x 12.5 mm thick, spaced 0.6 m apart.

The ends of the stiffeners in contact with the tank top are welded all around as shown in Fig Q9 and the thickness of the weld is 5 mm.

The bulkhead has sea water of density 1025 kg/m³ on one side to a depth of 4.85 m. Calculate the shear stress in the weld metal. (16)