Gerber beams are static plane carriers laid horizontally above two or more openings. The basic form of Gerber beams consists of articular bearings, one of which is motionless, but there are also more complex shapes. It is important in which span the joints are located, while their arrangement in that span is irrelevant. The analytical procedure can be carried out in two different ways, an unbroken procedure or a broken procedure. With the superpositional procedure we are tryin to bring the replacing system to a mechanical state in which Gerbers beam is by "adding" the bending moments above the supports. Influential lines are used to help calculate static sizes when changing the position or intensity of default loads. The graphical representation of the influential function on the beam is called an influential line. In advance, it is necessary to define the direction of action and the orientation of the force. For statically determined systems, an influential line can be drawn as a mechanism shift plan created by breaking the connection that transmits the observed force in the original system.