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In a steel arch the hinge allows free rotation, [2] somewhat resembling a common hinge. The most common hinged arch bridge varieties are the two-hinged bridge with hinges at the springing points and the three-hinged bridge with an additional hinge at the crown of the arch; though single-hinged versions exist with a hinge only at the crown of ...
The three-hinged arch is not only hinged at its base, like the two-hinged arch, yet also at its apex. The additional apical connection allows the three-hinged arch to move in two opposite directions and compensate for any expansion and contraction. This kind of arch is thus not subject to additional stress from thermal change.
If no horizontal thrusting forces are generated, this becomes an arch-shaped truss which is essentially a bent beam – see moon bridge for an example. If horizontal thrust is generated but the apex of the arch is a pin joint, this is termed as a three-hinged arch. If no hinge exists at the apex, it will normally be a two-hinged arch.
His earliest bridges were relatively long-span deck-stiffened arches in the tradition of Robert Maillart. For example, his Crestawald Bridge (1959) was a reinforced concrete bridge with a two-hinged arch. [4] But with the revolutionary new material — prestressed concrete — Menn saw that prestressing could actually replace the arch itself.
Each of the river spans is made up of five Melan-type, two-hinged, reinforced-concrete arch ribs of parabolic profile. [4] The bridge's longest ribs have a center to center span of 209 feet (64 m) and a rise of 29.71 feet (9.06 m); the ribs of the other spans vary from 176.5 to 121 feet (53.8 to 36.9 m) in length, with rises from 29.2 to 19.1 ...
Johann Wilhelm Schwedler; from Zeitschrift für Bauwesen, 1895 (the year after his death). Johann Wilhelm Schwedler (23 June 1823, Berlin – 9 June 1894, Berlin) was a German civil engineer and civil servant who designed many bridges and public buildings and invented the Schwedler truss and the Schwedler cupola.
An arch bridge with hinges incorporated to allow movement between structural elements. A single-hinged bridge has a hinge at the crown of the arch, a two-hinged bridge has hinges at both springing points and a three-hinged bridge has hinged in all three locations. [17]
Robert Maillart, c. 1925. Robert Maillart (16 February 1872 – 5 April 1940) was a Swiss civil engineer who revolutionized the use of structural reinforced concrete with such designs as the three-hinged arch and the deck-stiffened arch for bridges, and the beamless floor slab and mushroom ceiling for industrial buildings.