classified on the basis of their geometry and the manner in which they are
Classification I: The
classification based on the basis of geometry normally includes features such
as the shape of the X-section and whether the beam is straight or curved.
Classification II: Beams are
classified into several groups, depending primarily on the kind of supports
used. But it must be clearly understood why do we need supports. The supports
are required to provide constrainment to the movement of the beams or simply
the supports resists the movements either in particular direction or in
rotational direction or both. As a consequence of this, the reaction comes into
picture whereas to resist rotational movements the moment comes into picture.
On the basis of the support, the beams may be classified as follows:
Cantilever Beam: A beam
which is supported on the fixed support is termed as a cantilever beam:
Now let us understand the meaning of a fixed support. Such a support is
obtained by building a beam into a brick wall, casting it into concrete or
welding the end of the beam. Such a support provides both the translational and
rotational constrainment to the beam, therefore the reaction as well as the
moments appears, as shown in the figure below
Simply Supported Beam: The beams
are said to be simply supported if their supports creates only the
Some times the translational movement may be allowed in one
direction with the help of rollers and can be represented like this
Determinate or Statically Indeterminate Beams:
The beams can also be categorized as statically determinate or
else it can be referred as statically indeterminate. If all the external forces
and moments acting on it can be determined from the equilibrium conditions
alone then. It would be referred as a statically determinate beam, whereas in
the statically indeterminate beams one has to consider deformation i.e.
deflections to solve the problem.
Supports and Loads
Types of beams: Supports and Loads
engineering structures members are required to resist forces that are applied
laterally or transversely to their axes. These type of members are termed as
beam. There are various ways to define the beams such as
Definition I: A beam is a laterally
loaded member, whose cross-sectional dimensions are small as compared to
Definition II: A beam is nothing simply a
bar which is subjected to forces or couples that lie in a plane
containing the longitudnal axis of the bar. The forces are understood to act
perpendicular to the longitudnal axis of the bar.
III: A bar working under bending is generally termed as a beam.