## Whats is SFD and BMD?

Shear Force Diagram (SFD): The diagram which shows the variation of shear force along the length of the beam is called Shear Force Diagram (SFD). Bending Moment Diagram (BMD): The diagram which shows the variation of bending moment along the length of the beam is called Bending Moment Diagram (BMD).

**Where is SFD and BMD used?**

Shear and bending moment diagrams are analytical tools used in conjunction with structural analysis to help perform structural design by determining the value of shear force and bending moment at a given point of a structural element such as a beam.

**What is SFD engineering?**

in Strength of Materials. The shear force diagram (S.F.D) is drawn to represent the variation of shear force along a beam. The positive shear force is drawn as ordinate above arbitrary reference line and negative shear force below it.

### What force is shear?

Shear force is a force acting in a direction that’s parallel to (over the top of) a surface or cross section of a body, like the pressure of air flow over an airplane wing.

**What is a bending moment?**

A bending moment (BM) is a measure of the bending effect that can occur when an external force (or moment) is applied to a structural element. This concept is important in structural engineering as it is can be used to calculate where, and how much bending may occur when forces are applied.

**Where is the shear force zero?**

At the ends of a simply supported beam the shear force is zero. At the wall of a cantilever beam the shear force equals the vertical reaction at the wall. At the beam’s free end the shear force is zero. On any beam segment where no loads are applied, the shear force remains constant (horizontal line).

## What is difference between shear force and shear stress?

Shear force acts in a perpendicular direction to the large part (length) of the structure. Unlike shear force, Shear stress acts in a parallel to the surface. It causes one object to slip over another. It deforms original rectangular shape objects into parallelograms.

**What is neutral layer?**

Neutral layer (NL), also known as neutral plane or neutral surface, is a conceptual layer where the strain is equal to zero during materials bending [4].

**Why do we need BMD and SFD?**

Knowing the variation of the internal forces, stresses and deformations (including slope, deflections) so as to insure that the load carrying capacity and serviceability conditions of any structural system is not impaired. [Since BMD and SFD will allow us to know about the value of Bending Moments and Shear Forces at any point of our desire.]

### What is the difference between shear force diagram and BMD diagram?

As we know very well that shear force diagram i.e. SFD will tell you the variation of shear force along the length of the beam and bending moment diagram i.e. BMD will tell you the variation of bending moment throughout the length of the beam.

**What is the importance of SFD analysis in structural engineering?**

From SFD we can know where the maximum SF is acting and the critical point of shear..so that we can strengthen the structure against shear failure by providing adequate shear reinforcement like stirrups ,bent up bars, shear connectors etc and their optimum spacing..

**Do I need SFD and BMD After completing Civil Engineering?**

There is no need, if you are brilliant and can visualise all the behaviours of SF and B.M in your mind. What are the practical applications of SFD and BMD after completing civil engineering? Is this useful to learn in any way because I don’t really know any jobs based on these.