Beams are generally horizontal structural members which transfer loads
horizontally along their length to the supports where the loads are usually
resolved into vertical forces. Beams are used for resisting vertical loads,
shear forces and bending moments.
The beams usually have three different types of support:
- Hinged or pinned support
- Roller support
- Fixed support
Hinged or pinned support:
The hinged support is capable of resisting force acting in any direction of the plane. Hence, in general the reaction at such a support may have two components, one in horizontal and another in vertical direction. To determine these two components two equations of statics must be used. Usually, at hinged end the beam is free to rotate but translational displacement is not possible.
The hinged and roller supports are also termed as simple supports.
Roller support:
The roller support is capable of resisting a force in only one specific line or action. The roller can resist only a vertical force or a force normal to the plane on which roller moves. A reaction on this type of supports corresponds to a single unknown figure.
The hinged and roller supports are also termed as simple supports.
Fixed Support:
The fixed support is capable of resisting of force in any direction and is also capable of resisting a couple or a moment. A system of three forces can exist at such a support (i.e., two components of force and a moment).
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