Basic Statements 13

Question 1

Buckling is an example of structural instability

Answer 1

True

Question 2

When the applied loads that cause plastic buckling are removed, the structure will return to its original shape.

Answer 2

False - Elastic buckling will return

Question 3

There are applications where plastic buckling is incorporated in the design to absorb energy.

Answer 3

True

Question 4

The “dynamic stability method” is a limited analysis method which can be used only in dynamic buckling analyses

Answer 4

False - It is a general method that can always be used

Question 5

The finite element method is an example of a method which belongs to the category of “energy methods” and is based on the principle of virtual work

Answer 5

True

Question 6

Principle of virtual work: the potential energy is the sum of potential energies for the internal and external forces acting on a body/system

Answer 6

True

Question 7

When an elastic structure is in equilibrium, its potential energy has its maximum

Answer 7

False - minimum

Question 8

Stable equilibrium is achieved if and only if the potential energy PI is positive definite

Answer 8

True