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Q9) A ballast tank watertight bulkhead 5.0 m deep is stiffened by vertical angle bar stiffeners, 250 mm x 75 mm x12 mm thick, spaced 610 mm 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 6 mm.

The bulkhead has sea water of density 1025 kg/m³ on one side to a depth of 4.5 m.

Calculate the shear stress in the weld. (16)