FIRSTLY WHAT IS A BEAM ?
In a structure, horizontal member which takes transverse load (load parpendicular to the length of the beam) in addition to other loading is called BEAM.
In engineering structures like bridges, beam is one of the important structural member. In trusses and frames, pin-joined members take only tensile or compressive load, twisting load, etc., to take all types of load, i.e transverse load, tensile load, compressive load, twisting load, etc,.
CLASSIFICATION OF BEAMS :
Beams are classifed depending upon the type of support, as shown below:
- SIMPLY SUPPORTED BEAM:
As the name indicates, it is simplest of all the beams which is supported by a hing at one end a roller at other end.
- SIMPLY SUPPORTED BEAM WITH OVERHANG:
Here, one end or both ends of simply supported beam is projected beyond the suports, which means that the portion of beam extends beyond the hinge and roller supports.
- CANTILEVER BEAM:
A beam which is fixed at one end and free at other end is called cantilever beam. The fixed end is also known as built – support. The common example is wall bracket, projected balconies, etc. One end of the beam is cast in concrete and is nailed, bolted, riveted or welded. The fixed end does not allow horizontal linear movenment, verticall linear movement or rotational movement.
- CONTINUOUS BEAM :A beam which has more than support is said to be continous beam. The extreme left and right supports are end supports of a beam. Two intermediate beams because the raactions cannot be obtained by the equation of equlibrium