$-$ Design a Pratt Truss bridge structure that will carry a design load of $\backslash (200\backslash$mathrm$\{$kN$\}/\backslash$mathrm$\{$m$\}\backslash )($dead and traffic load combined.$)$ The length of the bridge is $50$ m $.$ Size each member so that a factor of safety value of $2$ is obtained. Select appropriate material and discuss how you arrived at your final design.

$-$ The truss system must have more than $\backslash (\backslash$mathbf$\{6\}\backslash )$ sections $(21$ members$).$ An example structure is shown below.

$-$ Approximate the line load of $\backslash (200\backslash$mathrm$\{$kN$\}/\backslash$mathrm$\{$m$\}\backslash )$ as point loads on the nodes. Define the loading and support conditions. Draw your truss design showing the loads and supports clearly.

$-$ Assign node and element numbers. Tabulate the nodal coordinates and element connectivity data.

$-$ Write a plane truss code and solve your plane truss system for nodal displacements, reaction forces, element forces and element stresses.

$-$ Tabulate your results as node numbers vs displacements, element numbers vs stresses and internal forces in each member.

$-$ Show that the design criteria is satisfied for each member.