DIFFERENT TYPE OF BRIDGES

Beam bridges are horizontal beams supported at each end by piers. They are made up mostly of wood or metal. Beam bridges typically do not exceed 250 feet long. The longer the bridge, the weaker.

Cantilever bridges Forth Railway Bridge Scottland,Edinburgh A cantilever bridge is a bridge built using cantilevers, 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 structural steel, or box girders built from prestressed concrete. The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1,500 feet (460 m), and can be more easily constructed at difficult crossings by virtue of using little or no falsework.

Arch bridges Akashi 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. A viaduct (a long bridge) may be made from a series of arches, although other more economical structures are typically used today.

Suspension bridges Severn bridge England Suspension bridges are suspended from cables. The earliest suspension bridges were made of ropes or vines covered with pieces of bamboo. In modern bridges, the cables hang from towers that are attached to caissons or cofferdams. The caissons or cofferdams are implanted deep into the floor of a lake or river.

Cable-stayed bridges Abdoun Bridge Jordan A cable-stayed bridge is a bridge that consists of one or more columns (normally referred to as towers or pylons), with cables supporting the bridge deck.

Truss bridges FortPittBridge Pittsburgh, USA Bowstring arch truss (Tied arch bridge) Truss bridges are composed of connected elements. They have a solid deck and a lattice of pin-jointed or gusset-joined girders for the sides.

Describe the following bridges

Brooklyn Bridge

Golden Gate Bridge

Sydney Harbour Bridge

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