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The original concrete deck of the 670 m (2,200 ft) North Viaduct of the Lions Gate Bridge was replaced with a lighter and wider orthotropic deck, carried out in sections using a series of short closures of the bridge. [3] Cantilever orthotropic decks allowed the Tamar Bridge to remain open whilst the main deck was replaced in 1999. An ambitious ...
The most ancient form of timber bridge is the log bridge, created by felling a tree over a gap needing to be crossed. [ citation needed ] Among the oldest timber bridges is the Holzbrücke Rapperswil-Hurden crossing upper Lake Zürich in Switzerland; the prehistoric timber piles discovered to the west of the Seedamm date back to 1523 B.C.
A suspended bridge deck will be suspended from the main structural elements on a suspension or arch bridge. On some bridges, such as a tied-arch or a cable-stayed , the deck is a primary structural element , carrying tension or compression to support the span.
In practice, most wood stringers are 16 inches (410 mm) in width due to limitations in milling. There are usually six stringers in a bridge. [18] Building the deck for a railroad bridge requires that a stringer lie directly beneath each rail, and that a stringer support each end of the railroad ties. Ties are usually 6 by 8 inches (150 by 200 ...
Beam bridges are the simplest structural forms for bridge spans supported by an abutment or pier at each end. [1] No moments are transferred throughout the support, hence their structural type is known as simply supported. The simplest beam bridge could be a log (see log bridge), a wood plank, or a stone slab (see clapper bridge) laid
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Building balsa wood bridges as a part of a unit on statics, structures, forces, or construction trades is used by teachers to make the learning environment hands-on and to give students a real-world example of material covered in class. The building of balsa-wood bridges is often used as an educational technology. It may be accompanied by a ...
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