2 5 points each State whether the following structures are s

2. (5 points each) State whether the following structures are stable or unstable, and statically determinant or indeterminant. If they are indeter- minant, state the degree of indetermin b) ia) C) d) e) i)

Solution

a)

Structure is stable and it is Statically determinate.

Degree of indeterminacy = 4-3-1=0.

b)

Structure is unstable and it is Statically determinate.

Degree of indeterminacy = 4-3-1-1=-1.

c)

Structure is stable and it is Statically determinate.

Degree of indeterminacy = 3*1-1=2

d)

Structure is stable and it is Statically determinate.

Degree of indeterminacy =3*1-1-1-1=0