4

Question 1

when all the forces in a structure can be determined strictly from the equilibrium equations

Answer 1

Determinate Structure

Question 2

structures having more unknown forces
than the available equilibrium equations

Answer 2

Statically Indeterminate Structure

Question 3

READ

Answer 3

If :
r = 3n, statically determinate
r > 3n, statically indeterminate

where:
r = reaction force and moment
n = the no. of parts or members

Question 4

A structure or a member is
STABLE if it satisfy the equations
of equilibrium and the members
are properly held or constrained
by the support.

Answer 4

STABILITY

Question 5

Two situations where the conditions for proper constraints have not been met:

Answer 5

Partial Constraints
Improper Constraints

Question 6

A case when a structure or one of its
members may have fewer reactive forces than the equations of equilibrium.

Answer 6

Partial Constraints

Question 7

A case where there may be as many
unknown forces as there are equations, however, instability or movement of a structure or its members can develop due to improper constraining by the supports.

Answer 7

Improper Constraints