Types of Joints | Rigid joints and Pin joints

Rigid joints

These are the joints which are capable of transferring axial forces as well as moment. For example Joints provided in the roof slabs.

Pin Joints:

These joints are capable of transferring axial forces but can not transfer moment. For example links of chain in cycle.

If body have no joints it is hard to break because there is no plane of failure.

Basic Difference between Pin and Rigid joints:

In pin joints there is relative rotations between two members whereas in rigid joints it is not possible.

When external forces acts on a body, whether it is axial or moment, it deforms. If the elastic limit is not exceeded by applying external force, then the work done in straining of material is stored in the form of strain energy. The energy stored in pin jointed Structures (where members of structures are in tension or compression), depends on the direct forces only. Whereas in structures having rigid joints such as beams and frames, shear stresses, bending stresses may also occur at any section. So in Rigid jointed structures, the energy stored depends on the shear stress, bending stress and magnitude of direct force.