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arch bridge 
Bridge whose deck is supported by suspenders attached to an arch, which exerts diagonal thrust against the lateral supports.
trussed arch 
Arched girder consisting of two chords joined by a triangulated network of struts.
thrust 
Point at which the arch is supported by the abutment.
lower chord 
Lower lengthwise steel girder forming the metal arch.
deck 
Set of components making up the structure that carries the bridge’s traffic lanes.
abutment 
Base of the pier; it supports the arch’s weight and thrust.
pier 
Solid concrete construction acting as counterweight to the thrust of the arch against the abutment.
column 
Sturdy component forming a vertical support.
portal frame 
Part of the deck’s frame over firm ground, lying on columns.
upper chord 
Upper lengthwise steel girder forming the metal arch.
arch 
Metal bow-shaped structure supporting the deck, whose load it transfers to the abutments.