Müller-Breslau's principle

In engineering and architecture, the Müller-Breslau principle is a method to determine influence lines.

[1] The principle states that the influence lines of an action (force or moment) assumes the scaled form of the deflection displacement.

This method is named after the German engineer Heinrich Müller-Breslau and it is one of the easiest way to draw the influence lines.

[2] Part (a) of the figure to the right shows a simply supported beam with a unit load traveling across it.

Part (e) of the figure shows the influence line for the bending moment at point B.