Three Hinged Arch Model MT 043

* Statically determinate three-hinged arch1
* Symmetrical or unsymmetrical arch1
* Various load cases: point load, distributed load, moving load

Item Description

Bridges are often constructed as three-hinged arches. This type of construction is particularly suitable when compression-proof building materials are available. Horizontal thrust occurs in the arch at the supports. It permits much lower bending moments in the arch than in the case of a beam on two supports with the same span. A significant longitudinal compressive force is active in the arch to produce this effect.

A three-hinged arch consists of a curved beam mounted on two fixed supports, and usually featuring the so-called crown hinge at its crown. The hinges on the two fixed supports absorb vertical and horizontal forces, and are known as abutment hinges. Their connecting line is the springing line. The crown hinge renders the system statically determinate.

Sci-tech Three Hinged Arch Model MT 043 includes two long arch segments and one short segment, of which two at a time are connected by a hinged joint producing a symmetrical or unsymmetrical three-hinged arch.

Technical Specifications

[1] investigation of 2 statically determinate three-hinged arches
[2] 3 arch segments: 2x long (together making a symmetrical arch), 1x short (together with 1x long:
unsymmetrical arch)
[3] hinged arch with 3 hinges: 1 crown hinge, 2 abutment hinges at the bearing points
[4] arch subjected to point load, distributed load (each by weights) or moving load
[5] 4 sets of weights to compensate for the support reactions of an abutment hinge
[6] storage system to house the components
[7] experimental set-up in frame

Technical Specifications
Aluminum arches
– 2x long: 480mm, total arch length: 960mm
– 1x short: 230mm, total arch length: 710mm
– arch height: 250mm
Weights
– 4x 1N (hangers)
– 36x 1N
– 16x 5N