Bridges from all over the World! By: Maria Peloro & Christine Sniffen Bridges powerpoint project 2nd period science
Type of Bridge Structure • Beam bridge Beam Bridges are the simplest type of bridge today. They are the direct descendent from the log bridge. It is used frequently in pedestrian bridges and for highway overpasses. Beam bridges are consisted of one horizontal beam with two supports usually on either end. Theses free standing bridges are usually built as a walkway or even for decoration.
Types of bridge structures • Cantiveler Bridge A cantilever bridge is a bridge built using cantivelers, structures that project horizontally into space, supported on only one end. For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from stuctual steel, or box girders built from prestressed concrete.
Types of bridge structures • Arch Bridge An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side.
Types of Bridge Structures • Suspension Bridges A suspension bridge is any type of bridge that makes significant use of tension rather than or in addition to compression. A suspension bridge usually has cables (else ropes or chains), anchored at each end of the bridge. Any load applied to the bridge is transformed into a tension in these main cables
Types of Bridge Structures • Truss Bridges A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges. A truss bridge is economical to construct owing to its efficient use of materials.
Bridges that currently exist • Verezzano Bridge The Verrazano-Narrows Bridge is a double-decked suspension bridge that connects the boroughs of Staten Island and Brooklyn on Long Island in New York City. The bridge is named for Italian explorer Giovanni de Verezzano, the first known European navigator to enter New York Harbor and the Hudson River , while crossing The narrows... continue for more info
Verezzano Bridge continue... Official Name: Verezzano- Narrow Bridge Carries: 12 total lanes (6 lanes upper and 6 lanes lower) of I-278 Locale: New York City (Staten Island –Brooklyn) Vertical Clearence: 15 feet- 4.6meters (the upper level) 14.4 feet- 4.4 meters (the lower level) Opening Date: November 21, 1964 (the upper level) June 28, 1969 (the lower level) Toll: $10.00 as of 16 March 2008, discount available with E-Z Pass
Bridges that currently exist • The Golden Gate The Golden Gate Bridge is a suspensionbridge spanning the Golden Gate, the opening of the San Francisco Bay onto the Pacific Ocean. As part of both U.S. Route 101 and State Route 1, it connects the city of San Francisco on the northern tip of the San Francisco Peninsula to Marin County. The Golden Gate Bridge was the longest suspension bridge span in the world when it was completed during the year 1937, and has become an internationally recognized symbol of San Francisco and California.
Links • http://farm3.static.flickr.com/2410/2530160763_c362bdb7a8.jpg • http://en.wikipedia.org/wiki/Beam_bridge • http://en.wikipedia.org/wiki/Cantilever_bridge • http://en.wikipedia.org/wiki/Arch_bridge • http://en.wikipedia.org/wiki/Suspension_bridge • http://en.wikipedia.org/wiki/Truss_bridge • http://images.google.com.bo/images?gbv=2&hl=es&safe=active&q=Verezzano+Bridge&sa=N&start=0&ndsp=20 • http://en.wikipedia.org/wiki/Verrazano-Narrows_Bridge • http://en.wikipedia.org/wiki/Golden_Gate_Bridge