A beam is a structural member whose longitudinal dimensions (width) is large compared to the transverse dimension (depth). The beam is supported along its length and is acted by a system of loads at right angles to its axis. Due to external loads and couples, shear force and bending moment develop at ant section of the beams. For the design of beam, information about the shear force and bending moment is desired.
Shear Force (S.F.)
The algebraic sum of all the vertical forces at any section of a beam to the right or left of the section is known as shear force.
Bending Moment (B.M.)
The algebraic sum of all the moment of all the forces acting to the right or left of the section is known as bending Moment.
Shear Force (S.F.) and Bending Moment (B.M.) Diagrams A S.F. diagram is one,
which shows the variation of the shear force along the length of the beam. And a bending moment diagram is one, which shows the variation of the bending moment along the length of the beam.
Before drawing the shear force and bending moment diagrams, we must know the different types of beam, load and support.
