Bridges 26145g

Made by Laura Hany

B R ID G ES

Types ofbridges  There are a lot of types of bridges all      

over the world such as Arch bridges Beam bridge Movable bridge Suspension bridge Truss bridge Covered bridge

Arch bridge  Arch bridge is one of the most popular types of bridges, which

came into use over 3000 years ago and remained in height of popularity until industrial revolution and invention of advanced materials enabled architect to create other modern bridge designs. However, even today arc bridges remain in use, and with the help of modern materials, their arches can be build on much larger scales.  The basic principle of arch bridge is its curved design, which does not push load forces straight down, but instead they are conveyed along the curve of the arch to the s on each end. These s (called abutments) carry the load of entire bridge and are responsible for holding the arch in the precise position unmoving position. Conveying of forces across the arch is done via central keystone on the top of the arch. Its weight pushes the surrounding rocks down and outward, making entire structure very rigid and strong.

Beam bridge  Bridge building doesn't get any simpler than

this. In order to build a beam bridge (also known as a girder bridge), all you need is a rigid horizontal structure (a beam) and two s, one at each end, to rest it on. These components directly the downward weight of the bridge and any traffic traveling over it.  However, in ing weight, the bream bridge endures both compressional and tensional stress. In order to understand these forces, let's use a simple model.

M ovable Bridge

Suspension bridge  As the name implies, suspension bridges, like the Golden

Gate Bridge or Brooklyn Bridge, suspend the roadway by cables, ropes or chains from two tall towers. These towers the majority of the weight as compression pushes down on the suspension bridge's deck and then travels up the cables, ropes or chains to transfer compression to the towers. The towers then dissipate the compression directly into the earth.  The ing cables, on the other hand, receive the bridge's tension forces. These cables run horizontally between the two far-flung anchorages. Bridge anchorages are essentially solid rock or massive concrete blocks in which the bridge is grounded. Tensional force es to the anchorages and into the ground.

Truss Bridge

Covered bridge  A covered bridge is a timber-truss bridge with a

roof and siding which, in most covered bridges, create an almost complete enclosure.[1] The purpose of the covering is to protect the wooden structural from the weather. Uncovered wooden bridges have a lifespan of only 10 to 15 years because of the effects of rain and sun. [2]  Bridges having covers for reasons other than protecting wood trusses, such as for protecting pedestrians and keeping horses from shying away from water, are also sometimes called covered bridges.

Bridges In Egypt  Stanley Bridge (Alexandria)  Sixth of October Bridge (Cairo)  University Bridge (Cairo)  Imbaba Bridge  Qasr al-Nil Bridge