QUESTION $6$

Deflection of Truss by Virtual Work Method

$(15\%)$

The truss shown in Figure $Q_6$ below is subjected to two vertical concentrated of $18kN$ at

joints $B$ and $C.$ The material properties of the truss are: $(1)$ All members of the truss has a

cross sectional area of $300m{m}^2$ and $(2)$ Young's Modulus of Elasticity $(E)=200,000$MPa.

Answer the following:

Calculate the values of the support reactions at joints A and D;

Calculate the internal forces in the member of the truss due to actual external

loads by method of joint or method of section.

Calculate the internal forces in the member of the truss due to a vertical unit load

at joint $C.$

Calculate the vertical deflection$/$displacement at joint $C$ of the truss

Use the Table in the summary of analysis

Table