5003 Lectures - Faculty of Engineering and Applied Science

E5003 - Ship Structures I 186
© C.G. Daley
Shear in Multi-cell Sections
Consider a tanker with two longitudinal
bulkheads;
There will likely be two spots in the cell where
m=0. The shear flow will look something like the
sketch to the left.
To solve the statically indeterminate problem, we
apply the same kind of technique that we used in
the Force Method to solve indeterminate beams.
We will cut the structure, releasing the shear force
and allowing shear deflection (called 'slip'). We will
then determine how much shear we have to apply
to the cell to remove the slip.
This is qualitatively similar to the correction of
movements in the force method.
For any case where the loops are not adjacent, the
steps in the solution process are;
1) Make n cuts to make the problem into a
statically determinate problem.
2) Solve the statically determinate problem.
3) Find the N incompatible deflections (slips).