# SFD and BMD – Shear force diagram and Bending Moment diagram

SFD and BMD stand for the shear force diagram and the Bending moment diagram applied to the structure respectively. When you design or analyze any structure then you have to consider the total shear force and bending moment to get the required strength and durability of the structure.

## What is Share Force?

The algebraic sum of all vertical force acting on the structure is known as shear force. The force acting on it may be toward upward or toward the downward direction. It’s SI unit is Newton (N)

The graphical representation of the shear force is known as SFD (Shear force Diagram)

## What is Bending Moment?

The algebraic sum of all moments acting on the structure is known as bending moment. It may be toward a clockwise direction or maybe an anti-clockwise direction. It’s SI unit is Newton-meter (N-m)

The graphical representation of the bending moment is known as BMD (Bending Moment Diagram)

Shear force diagram and bending moment diagram depends upon the types of load acting on the structure. So, first of let us know something about different type of load.

The load acting on single concentrated load on the structure is known as point load.It’s unit is Newton (N)

The load acting uniformly throughout the structure is known as a uniformly distributed load. It”s unit is N/meter

The load acting with constant variation throughout the structure is known as uniformly variable load.

## Shear force Diagram (SFD) due to different load

• Point load makes Constant Diagram
• Uniformly Distributed Load (UDL) makes Linear Diagram
• Uniformly Variable load (UVL) makes Parabolic Diagram

### Bending Moment Diagram (BMD) due to different load

• Point load makes Linear Diagram
• Uniformly Distributed Load (UDL) makes Parabolic Diagram
• Uniformly Variable load (UVL) makes the Curve Diagram

## SFD and BMD for different types of load

So, In this way, you can draw the SFD and BMD of different types of load on the structure.

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