Two-point loads of 50KN and 75KN spaced 3m apart with the 50KN load leading passes over a simply supported beam with a span of 12m. Using Influence Lines Diagrams calculate The section and magnitude of the absolute maximum bending moment that may occur on the beam.

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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.