Beams

Table of Contents


Beam Bridge [1]

Image of a beam bridge.

What are Beams?

  • A beam is a structural element that resists loads applied to the beam's axis.
  • Beams primary mode of deflection is bending.
  • Beams are built with supports which produce reaction forces when loads are applied to the beam's axis. [2]

Characteristics of Beams

General Terminology

  • Span: The length of a beam from end to end.
  • Height: The vertical length of a beam.
  • Width: The length of a beam from side to side.
  • Load: The force exerted on a beam.
  • Moment: The rotational effect on a body produced by a force

Measurements

  • Beams are measured through their; span, height and width.

Moment of Inertia

  • The moment of inertia is dependent on the beams cross-section.
  • It is a measure of the beams resistance to bending.

Bending Moment

  • The bending moment occurs when a force or moment is applied at a certain distance from a reference point causing the beam to bend. [3]

Beam Deflection

  • Beam deflection refers to how much a beam deflects from it's original shape due to loads applied to the beam[4]. 

Deflection of a Beam [5]  

Diagram showcasing beam deflection.


Reaction Forces

      • Supports prevent deflection of beams by producing reaction forces which counteract the loads applied to the beam.

Forces Applied to a Beam Resulting in Reaction Forces [6]

Diagram showcasing forces applied to a beam and the resulting reaction forces.


Types of Beams
 (Page Link)

Beams Use Cases


Exposed Beams in HomeTimber BeamsSteel Beams

Image of exposed beams in a home.

Image of timber beams used in construction.

Image of steel beams.

References

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