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The Rigid Frame (Rahmen) bridge, as the name suggests, is a structure whose superstructure and substructures
are rigidly connected. If the rigid-frame bridges are made with steel,
the superstructure and substructures are connected by bolts or by welding.
When pre-stressed concrete is used, those two structures are molded as
one.
Due to its unified structural character, a rigid frame bridge suffers bending moments, axial forces and shier forces simultaneously. This type of bridge is applied to relatively longer spans. In Japan, this type of bridge is frequently used for viaducts crossing over highways, or viaducts crossing valleys.
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