Hinge Hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other translations or rotations being prevented, and thus a hinge has one degree of freedom. Hinges may be made of flexible material or of moving components. In biology, many joints function as hinges like the elbow joint. There are many types of door hinges. The main types include: Other types include: Since at least medieval times there have been
Concrete hinge Concrete hinge Concrete hinges are hinges produced out of concrete, with no or almost no steel in the hingeneck, which allows a rotation without a relevant bending moment. This high rotations are resulting from controlled tensile cracks as well as creep. Concrete hinges are mostly used in bringe engineering as monolithic, simple, economic alternative to steel hinges, which would need regular maintenance. Concrete hinges are also used in tunnel engineering. A concrete hinge consist of the hinge neck, which has a reduced cross section and of the hinge heads, which have a strong reinforcement. Freyssinet invented the concrete hinges. Leonhardt