Question $1$

For the non$-$parallel chord truss bridge, $x=6m$ and $y=3m.$

$(1)$ Determine the influence lines for $F_{CD}(F_1),F_{Cd}(F_2)$;

$(2)$ The bridge is to be designed for the equivalent moving load detailed below with $P=115kN$ and $q=10k\frac{N}{m}.$ Compute the maximum tensile and compressive axial forces in member Cd $(F_2).$