What is a hinged node?

A hinged node is a type of node characterized by the ability to rotate around a point at the node, but not translate. This type of node is similar to a hinge that is free to rotate within a certain range without exerting excessive constraints on neighboring bars.

In structural engineering, hinged nodes are commonly used to connect two or more bars to form a stable structure. Due to their free-rotating nature, hinged nodes can absorb and transfer forces perpendicular to the node to a certain extent, thus allowing the entire structure to withstand larger loads.

In addition, hinged nodes also help to improve the stiffness of the structure. When a bar undergoes a bending deformation, the hinged nodes can adapt to this deformation instead of forcing the bar into position. This avoids brittle fracture of the bars due to excessive restraining forces.

In practice, hinged nodes may be subjected to shear forces and bending moments, resulting in damage or excessive deformation of the node. Therefore, when designing and applying hinged nodes, it is necessary to give full consideration to their bearing capacity and stability and take corresponding measures to improve the stiffness and strength of the nodes.