definition
strict definition
trestle
A bridge or viaduct whose deck is carried by a continuous rigid support framework, often over many small spans.
A trestle is a span whose deck is supported by a continuous rigid frame, often forming a series of small bridges but generally acting as a single long support network for the deck above.
The supports work as a connected framework beneath the deck. A succession of short openings can give the appearance of several small bridges.
The form is defined by this continuous support network. It is not restricted to one construction material or to railway traffic.
Related definitions
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arch bridge
A bridge whose deck is supported from below by one or more arches carrying loads toward their end supports. -
beam bridge
A bridge with a rigid spanning member resting on supports at both ends of each span. -
cable-stayed bridge
A bridge whose deck is supported by tense cables mounted on columns or in the surrounding landscape. -
cantilever bridge
A bridge whose spans project from anchoring piers instead of simply resting on supports at both ends. -
float bridge
A bridge whose span floats on water and is simply anchored to stabilization points. -
movable bridge
A bridge of any form which is capable of controlled movement in order to lift or remove its span. -
suspension bridge
A bridge whose span hangs from main cables anchored at its ends, commonly supported above the span by towers. -
truss bridge
A bridge whose span is carried by a connected truss framework with members acting in tension and compression.