Steel structures are made up of a framework of columns and beams that act together to support the loads that they are required to carry. These loads are well defined in building codes or can be as required by the stakeholders of the final built structure.

In a steel structure, the various members are all joined together to give the framework the required rigidity. This results in the load that the individual members of the structure are carrying to create turning moments in the joints, which subject the joint and the individual members to additional forces that are required to be considered in any design of steel structure.

In steel design, joints must possess adequate rotational stiffness to resist shear, forces, and moments that are calculated while analyzing the frame. The assumption is that the joints are rigid and transfer additional stress on each member through the moments created.