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Thousands of orthotropic deck bridges are in existence throughout the world. Despite the savings and advantages (up to 25% of total bridge mass can be saved by reducing deck weight, as the weight reductions extend to cables, towers, piers, anchorages, and so forth), the US has only about 60 such bridge decks in use as of late 2005.
The design was patented in 1820 by architect Ithiel Town. Originally a means of erecting a substantial bridge from mere planks employing lower–skilled labor, rather than heavy timbers and more expensive carpenters and equipment, the lattice truss has also been constructed using many relatively light iron or steel members.
A well deck is an exposed deck (weather deck) lower than decks fore and aft. [2] In particular, it is one enclosed by bulwarks limiting flow of water and thus drainage so that design requirements are specific about drainage and maintenance of such drainage with that definition applying even to small vessels.
The suspension cables are embedded in the deck, which follows a catenary arc between supports. As with a simple suspension bridge, the weight is taken by the suspension cables, but unlike the simple span, the deck or ribbon is stressed in compression, which adds to the stiffness of the structure (simple suspension spans tend to sway and bounce).
A well-known example of this type is the Sydney Harbour Bridge in Australia, which is based on the Hell Gate Bridge in New York City. [2] Other bridges include the Chaotianmen Bridge in China, the world's longest through arch bridge; [3] Tyne Bridge of Newcastle upon Tyne; the Bayonne Bridge that connects New York City to New Jersey, which is longer than the Sydney Harbour Bridge; the Ahwaz ...
The bowstring truss design fell out of favor due to a lack of durability, and gave way to the Pratt truss design, which was stronger. Again, the bridge companies marketed their designs, with the Wrought Iron Bridge Company in the lead. As the 1880s and 1890s progressed, steel began to replace wrought iron as the preferred material. Other truss ...
William Howe was a construction contractor in Massachusetts when he patented the Howe truss design in 1840. [3] That same year, he established the Howe Bridge Works to build bridges using his design. [4] The first Howe truss ever built was a single-lane, 75-foot (23 m) long bridge in Connecticut carrying a road. [1]
A steam shower A steam shower is a type of bathing where a humidifying steam generator produces water vapor that is dispersed around a person's body. Steam showers are generally found in self-contained enclosures that prevent the water vapour from escaping into the rest of the room, avoiding damage to drywall , paint , or wallpaper .
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