Draw the influence lines for the forces in members BC and CG of the truss shown below. Live loads are transmitted to the bottom chord of the truss. Indicate numerical values for the peaks. (hint: for the case of CG, first establish a relationship between forces in CG and FG.) A G B C D 4 panels at 16 ft = 64 ft- H E 16 ft

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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.