To$-$do:

Problem Statement:

For the $2-D$ truss shown in the Figure, a horizontal of $P=400kN$ is applied in $x$ direction at Node$-2.$

a$)$ Write down element stiffness matrix for each element;

b$)$ Using direct stiffness method solve unknown displacements;

c$)$ Evaluate the stress in element $2$ and $3$ ;

d$)$ Determine the reaction force at Node $2$ in Y$-$direction.

Each element:

Young's modulus $E=30$GPA :

Cross sectional area $A=1\mathrm{.}50{10}^{-4}{m}^2$