$5.$a$)$ For the determinate, two$-$span beam shown, draw the influence lines for:

i$)$ bending moment at point $B$

ii$)$ shear force immediately right of point $C,$ and

iii$)$ reaction at support $C$

For each influence line, calculate and indicate the value of the influence

coefficient that has the maximum absolute value.

b$)$ A vehicle, which is idealized as the three point loads spaced as shown below,

moves across the truss on beams at the level of the upper chord of the truss.

Calculate and show the influence line for force in member $U_2-L_1.$ Show the

maximum and minimum ordinates on a sketch of the influence line and calculate

the maximum compression force in member $U_2-L_1$ caused by the vehicle as it

crosses the structure.

Direction of Travel