For the beam as loaded below by a moving concentrated live load of 20 kN.     1. The maximum ordinate of the influence line for the reaction at the left support is most likely equal to : a. 0.14 b. 0.23 c. 0.35 d. 0.28 2. The maximum positive value of the left reaction due to the moving concentrated live load if its location is at point B is :  a. 10.15 kN b. 17.25 kN c. 14.20 kN d. 18.50 kN 3. The value of the maximum positive bending moment at B due to the live load is equal to :  a. 35.25 kN-m b. 28.40 kN-m c. 40.12 kN-m d. 50.25 kN-m

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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.