Draw the influence lines for forces in bars AL and KJ. Using the influence lines, determine the maximum live load force (consider both tension and compression) produced by the 54-kip truck as it transverses the bridge, which consists of two trusses. Assume  the  truck moves  along  the  center  of  the  roadway  so  that one-half  of the truck road is carried by each truss. Assume the truck can travel in either direction. Note: Construct  the  influence  lines  of  each  loaded  structure  by equilibrium method not muller-breslau's principle. Use the ordinates of the influence lines to calculated the  load  for  the  required member  support or section.

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A: Using ILD calculation of -

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Influence Lines

The graphs that show the variation of a function at a specific point on a beam or truss due to a unit load placed at any point along the structure are known as influence lines in engineering. Some common functions that are studied with influence lines are shear, moment, and deflection. In designing beams and trusses, it is important to use influence lines in structures where loads would move along their span such as bridges, crane rails, conveyor belts, floor girders, etc. The influence lines help to study where a load will create the maximum effect for any of the functions.