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BEAMS & CLASSIFICATION OF BEAMS

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BEAM:

A beam is a structure generally a horizontal structure on rigid supports and it carries mainly vertical loads. Therefore, beams are a kind of load bearing structures. The horizontal beam is fastened to supports by different types of joints.

Depending upon the types of supports beams can be classified into different catagories.

CANTI-LEVER BEAMS:

A beam can be at stable equilibrium with a single fixed support at one end and the other end remains free, which is called as the free end while the other end is known as fixed end. This kind of beam is known as Canti lever beam. The fixed joint at the fixed end produces a horizontal, a vertical reactions and a reaction moment at the fixed end. It is the most common type of beam we use to see around. As a canti lever beam is supported at one side only, hence, the support must bear moment as well as vertical load. Hence, only fixed joint has to be applied to a cantilever beam.

SIMPLE SUPPORTED BEAM:

A beam supported as just resting freely on the walls or columns at its both ends is known as simply supported beam. This is the simplest type of beam. The supports at both sides produce two vertical upward reactions. It can not withstand lateral/ horizontal loading on the beam.

There will be two vertically upward reactions at the ends of a simply supported beam. A simply supported beam can not resist any horizontal load component.

OVER HANGING BEAM:

A beam having its end portion or both the end portions extended in the form of a canti-lever beyond the support or supports is called as over hanging beam. In a over-hanging beam, the beam may extend beyond support in either side or both sides. In a overhanging point of contraflexure has been formed.

Above those beams are statically determinate. It means that those beams can be analysed applying the conditions of equilibrium. We can determine the values of the unknown reactions.

There are beams which can not be analysed applying the conditions of equilibrium of...


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