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A fixed arch bridge, that is one without hinges, exerts a bending moment at the abutments and stresses caused by change of temperature or shrinkage of concrete have to be taken up by the arch. A two-hinged arch has a hinge at the base of each arch (the springing point), while a three-hinged arch has a third hinge at the crown of the arch. [3]
The actual resolution of forces will depend upon the bridge' design. [1] 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.
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. The prestressed deck of his arch bridge could become the main supporting member without the arch.
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. Unlike the other ...
The thrust of the two-hinged arch above the central opening is taken up by a tension band that engages the first node of the bottom chord. The arch stands at a height of 4.35 meters above the two supports and 1.60 meters in the center. The arrow height of the bottom chord measures 10.57 meters.
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The construction costs for the Rhenish Railway were about 2.5 million thalers. The ever-increasing rail traffic across the bridge and the increasingly heavy trains were already starting to damage the bridge by 1910 and at the beginning of 1914 the first plans for a new bridge were being drafted, but were dropped because of the First World War .
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