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4 de nov. de 2015 · The bridge is built over the Charles River. In this version 'built' has the sense of 'constructed'. So it may be used to describe an old bridge because, though made in the past, the bridge remains, to this day, constructed over the Charles River. The bridge was built over the Charles River.
- Perhaps if I give you an example of is built and was built you will be better able to understand. Tower Bridge is built over the River Thames...
- The way a bridge is built is as follows: [...] That bridge was built over the Charles River in 1889. Bridges have been built over the Charles R...
- The bridge is built over the Charles River. The bridge was built over the Charles River. Both of these sentences use the passive voice. The first...
- Both of your sentences use past participles as participial adjectives . The word built is the past participle and it is being used after the ver...
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bridge, structure that spans horizontally between supports, whose function is to carry vertical loads. The prototypical bridge is quite simple—two supports holding up a beam—yet the engineering problems that must be overcome even in this simple form are inherent in every bridge: the supports must be strong enough to hold the structure up, and the span between supports must be strong enough to carry the loads. Spans are generally made as short as possible; long spans are justified where good foundations are limited—for example, over estuaries with deep water.
All major bridges are built with the public’s money. Therefore, bridge design that best serves the public interest has a threefold goal: to be as efficient, as economical, and as elegant as is safely possible. Efficiency is a scientific principle that puts a value on reducing materials while increasing performance. Economy is a social principle that puts value on reducing the costs of construction and maintenance while retaining efficiency. Finally, elegance is a symbolic or visual principle that puts value on the personal expression of the designer without compromising performance or economy. There is little disagreement over what constitutes efficiency and economy, but the definition of elegance has always been controversial.
Modern designers have written about elegance or aesthetics since the early 19th century, beginning with the Scottish engineer Thomas Telford. Bridges ultimately belong to the general public, which is the final arbiter of this issue, but in general there are three positions taken by professionals. The first principle holds that the structure of a bridge is the province of the engineer and that beauty is fully achieved only by the addition of architecture. The second idea, arguing from the standpoint of pure engineering, insists that bridges making the most efficient possible use of materials are by definition beautiful. The third case holds that architecture is not needed but that engineers must think about how to make the structure beautiful. This last principle recognizes the fact that engineers have many possible choices of roughly equal efficiency and economy and can therefore express their own aesthetic ideas without adding significantly to materials or cost.
Generally speaking, bridges can be divided into two categories: standard overpass bridges or unique-design bridges over rivers, chasms, or estuaries. This article describes features common to both types, but it concentrates on the unique bridges because of their greater technical, economic, and aesthetic interest.
Britannica Quiz
Bridge Quiz
There are six basic bridge forms: the beam, the truss, the arch, the suspension, the cantilever, and the cable-stay.
The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the one-mile-wide (1.6 km) strait connecting San Francisco Bay and the Pacific Ocean.
- 4200 ft, about 0.79 mi (1.27 km)
- 8980 ft, about 1.70 mi (2.74 km)
- May 27, 1937; 86 years ago
- Golden Gate
5 de jul. de 2023 · Bridges are made up of various structural elements that keep the bridges functional and safe for long-term use. While not every bridge is built the same, these general components make up a basic bridge structure. Deck: The deck is the roadway surface of the bridge, where vehicles, pedestrians or other forms of traffic travel.
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Hace 4 días · Its construction, under the supervision of chief engineer Joseph B. Strauss, began in January 1933 and involved many challenges. The strait has rapidly running tides, frequent storms, and fogs that made construction difficult. During one such fog on August 14, 1933, a cargo vessel collided with the access trestle, causing serious damage.
- The Editors of Encyclopaedia Britannica
A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or railway) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross.
Description. History. Usage. Notable events. Impact. See also. References. External links. Brooklyn Bridge. The Brooklyn Bridge is a hybrid cable-stayed / suspension bridge in New York City, spanning the East River between the boroughs of Manhattan and Brooklyn.
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