0
Thermal expansion and contraction can put huge stresses into a large structure such as a bridge. To minimise this effect, the rollers are designed to allow the end of the bridge to move with the expansion and contraction.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Where are some bridges used why?
some bridges are used to get to the other side of something
What are some beam bridges?
Most highway bridges and railroad bridges are simple beam bridges. In this type of construction, the road surface or deck is supported by a series of longitudinal beams made of concrete, steel or timber. These in turn rest on bearings, which reston piers or abutments.
What are the materials needed to make a beam bridge?
Beam bridges are the most simple of structural forms being supported by an abutment at each end of the bridge deck. No moments are transferred throughout the support hence their structural type is known as simply supported.The simplest beam bridge could be a slab of stone, or a plank of wood laid across a stream. Bridges designed for modern infrastructure will usually be constructed of steel or reinforced concrete, or a combination of both. The concrete used can either be reinforced, prestressed or post-tensioned.Types of construction could include having many beams side by side with a deck across the top of them, to a main beam either side supporting a deck between them. The main beams could be I-beams, trusses, or box girders. They could be half-through, or braced across the top to create a through bridge. A footbridge using beams over a stream in Dordogne, FranceBecause no moments are transferred, thrust, as from an arch bridge, cannot be accommodated, so leading to innovative designs, such as lenticular trusses & bow string arches, which contain the horizontal forces within the superstructure.Beam bridges are not limited to a single span. Some viaducts such as the Feiyunjiang Bridge in China have multiple simply supported spans supported by piers. This is opposed to viaducts using continuous spans over the piers.Beam bridges are often only used for relatively short distances because, unlike truss bridges, they have no built in supports. The only supports are provided by piers.
Can you have information on bridges?
Yes, you can. -All of us have some information on bridges, some more than others.
How do movable bridges work?
Certainly some bridges can. Swing bridges, bridges that raise up, these though, stay in one location. Pontoon bridges are capable of being moved from place to place and are in use worldwide.
How did most industrialists feel about the laissez-fairs theories?
some supported it and some rejcted it but i may be wrong
Are bridges manmade?
Most bridges are manmade, built in the location where they are required. Some natural bridges of rock or timber exist in wilderness areas.
What are some of Ruby Bridges facts?
-Ruby bridges was the only African American to go to an all white school -Ruby bridges is 58 -Ruby bridges when to William frantz school
How do tornadoes affect bridges?
Tornadoes have caused bridges to collapse on a number of occasions. In some cases pieces of bridges have been carried away by tornadoes.
Are bridge always over the water?
No some bridges are over highways
How were bridges constructed in the early 1800s?
Bridges built in the 1800s were typically constructed of wood or stone. Some bridges were also starting to be constructed of steel in the early 1800s.
What are the stresses on bridges?
There are a number of stresses inflicted upon bridges. Some of these stresses include compression, tension, as well as bending.
