Exam 1

Question 1

What is obtained in preliminary structural design?

Answer 1

Location, spacing and scantlings of the principal members.

Question 2

What are the six main steps of rationally-based preliminary structural design

Answer 2

1) Construction of the finite element model.
2) Determination of the external loads.
3) Finite Element Analysis.
4) Limit State Analysis.
5) Formulation of constraints.
6) Optimization.

Question 3

Name three load effects at the hull girder level

Answer 3

1) Vertical Bending Stress
2) Horizontal Bending Stress
3) Shear Stress
Also: (4) Torsional Stress

Question 4

What is the single most important load effect in the analysis and design of ship structures?

Answer 4

Maximum hull girder bending moment.

Question 5

What is a “limit state” and what are the two main categories?

Answer 5

A “limit state” is any condition in which a structure or a structural member has become unfit for one of its intended roles because of one or more loads and/or load effects. The two main categories are unserviceability and collapse.

Question 6

What are the three main types of structural failure?

Answer 6

Plastic deformation, instability (buckling) and fracture.