For the truss shown in the figure below, assume that the loads are being transmitted to the bottom chord and draw the influence lines for member DI and EK. Also, considering the 3-point moving load as shown, determine the following member forces. Assume that the loads move only to the right. a. Maximum tension on member DI in kN, put “0” if none. b. Maximum compression on member DI in kN, put “0” if none. c. Maximum tension on membe EK in kN, put “0” if none. d. Maximum compression on member EK in kN, put “0” if none. a= 5.1 m b= 6.3 m c= 62 kN d= 78kN

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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.