In #StructuralEngineering #Analysis, #InfluenceLines are used to depict the variation of quantity at a particular location as the location of a #Load or #Action is changed. In the #Animation shown, we can see the change in #BendingMoment in a #StaticallyDeterminate #Beam as a unit force moves from one end to the other. Both the #BendingMomentDiagram and the influence line for bending moment at the centre of the left-hand span, B, are shown. The influence line is often used as a tool to determine where the load should be placed to cause the most extreme cases of interest, say for #design purposes.

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