Draw the influence line for the force in the members U,L of the pratt truss shown in figure. The unit load moves along the lower chord of the truss LL,. Find the maximum tensile or compressive force in the member due to uniformly distributed load of 50 kN/m. Which can convey any portion of the span. 4m 6@ 3m 18m

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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.