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## Q. 8.4

Draw the influence lines for the vertical reaction and the reaction moment at support $A$ of the frame shown in Fig. $8.6 (\mathrm{a})$.  ## Verified Solution

Influence Line for $\boldsymbol A_{y}$ .

$\begin{array}{r} +\uparrow \sum F_{y}=0 \\ A_{y}-1=0 \\ A_{y}=1 \end{array}$

The influence line for $A_{y}$ is shown in Fig. 8.6(c).

Influence Line for $\boldsymbol M_{A}$.

\begin{aligned} +\curvearrowleft \sum M_{A} &=0 \\ M_{A}-1(x-6) &=0 \\ M_{A} &=x-6 \end{aligned}

The influence line for $M_{A}$ is shown in Fig. $8.6(\mathrm{~d})$.