To use the virtual work method, start by removing the real loads and place a unit load or

unit couple moment at the desired location in the direction the displacement or rotation

is to be determined. For example, to determine the downward deflection at $C$ due to the

load $P$ in $($Figure $1),$ apply a unit virtual force down at $C.$

Establish $x$ coordinates for each region of the beam or frame that has no discontinuity of

real or virtual load. In the example, three regions are required because there are

discontinuities at $B$ and $C.$ With all the real loads temporarily removed and the virtual

load or couple moment in place, calculate the internal moment $m$ or $m_{}$ as a function

Figure

grad Part C

For the frame shown in $($Figure $3),$ determine the horizontal deflection at $C$ when $a=10ft,b=12ft,$ and $w=60\frac{k}{f}t.$ Assume $A$ is pinned, $C$ is a roller, and $B$ is fixed. Take $E=2\mathrm{.}9{10}^4$ksi and $I=400$ in ${?}^4$

Express your answer in the appropriate units to three significant figures.

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