Assume that the loads are being transmitted to the bottom chord in the truss depicted, and draw the influence lines for members DK and CI. Determine the following member forces using the 3 point moving load indicated. Assume the loads only move to the right. Questions a. Maximum tension on member DK in kN. b. Maximum compression on member DK in kN. c. Maximum tension on member CI in kN. d. Maximum compression on member CI in kN.

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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.