For the plane truss that consists of 3 different elements shown in the Fig.4., cross section of each member of the structure is circular and diameter is d1, d2 and d3.
For, $E_1$ = 200 GPa, $E_2$ = 70 GPa, $E_3$ = 140 GPa
d1 = 20 mm d2 = 30 mm d3 = 40 mm
F1=40kN, F2=60kN.
Determine,
a) Elemental stiffness matrix
b) Global stiffness matrix
c) Nodal displacements
d) Element forces
e) Reaction forces
Figure 4. Plane Truss
Note: Supports do not allow any freedom in upwards direction.