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Bridges and Tunnels
A bridge is a link between two places, such as over a river, a road or a depression, that caters to pedestrians and/or vehicles. A tunnel is an underground link between two places, often underneath a riverbed, for pedestrians and/or vehicles.
4,393 Questions
How many bridges are in pittsburg pa?
The city of Pittsburgh, PA has 446 bridges. Some of its major bridges are the Fort Pitt Bridge, the Panhandle Bridge, the Smithfield Street Bridge, and the Liberty Bridge.
Where are beam bridges located in the world?
there is a beam bridge in London and Australia ans the u.s.a.
In this short story Ernest Hemingway uses a lot of metaphors and symbols. One of the symbols is the bridge, which represents uncertainty and dangers. Those are the feelings most of the people have during wartime. In contrast to this stands the fact that the story takes place on Easter Sunday, a holiday that stands for hope and the faith in God. The feelings of the refugees probably stand in the same contrast. On the one hand they feel very frightened and worried, but on the other hand they do not want to lose hope. The animals also stand for different qualities. The pigeons, for example, represent peace and harmony and the fact that they fly away, away from the war, maybe is a reference to the refugees who flee from the war to a safer place. The cat, being a symbol of independence, does not need anybody to survive, but the goat is often used as a sacrificial animal and this probably represents the old man and his situation. Like a goat which is sacrificed, the old man's fate is sealed.
When was tappan zee bridge built?
Construction started in 1956 and the bridge opened up for traffic in 1955.
What is the traffic on the Danyang Kunshan Grand Bridge?
The bridge carries the Beijing-Shanghai High-Speed Railway.
Where is the Madison County Covered Bridge Preservation Association Inc in Winterset Iowa located?
The address of the Madison County Historical Society is: 815 S 2Nd Ave, Winterset, IA 50273-2108
What is the strongest building structure?
Think of it this way, unquestionably the strongest structure is a solid.
But now the compromises begin: Is weight a factor? Is material cost a factor? Does it need to be hollow?
Once these parameters are known, then the loads must be determined. Are the loads static, dynamic, vibratory, etc. Are the loads in shear, torsional, moment, cantilever, etc. Do we need to consider earthquake, thermal loads, or impact loads?
And we must look at the desired building material(s):
steel has the same strength in all directions (isotropic, wood, concrete, and composites are wildly non-isotropic
so the direction of the loads becomes important.
Take the case of a sky scraper. We must consider the shape of the occupied area as well as all the necessary load cases. Thus we end up with a square girder structure which is not the strongest perhaps, but is adequate and meets all the other requirements.
Considering bridges, for short spans the basic AASHTO
concrete girder and deck is extremely durable and strong as well as cost effective. For longer spans we look at arcs of structural steel which are extremely strong and beautiful, or cable suspension/cable stayed designs using concrete piers that can withstand hurricane force winds.
The Eiffel Tower was built for the International Exhibition of Paris in 1889, but despite the age, it remains one of the worlds most brilliant examples of construction.
Some key observations:
1. Notice that it is open, the structural elements are exposed. This reduces wind loads (routinely 100 MPH at the top!) and saves cost.
2. Notice the arches combined with the "X" structural shapes. Arches are very efficient material wise, the "X" prevents buckling.
3. Notice the width at the base. This is an amazingly stable and
strong structure.
4. Steel (actually puddled or wrought iron in this case) members can be rapidly assembled. This required 300 workers for two years. A bargain!
5. Super lightweight: it has been said that a 1 foot high scale model would only weigh as much as a nickel!
Which is the longest bridge in world and where?
The longest bridge in Japan and the world is the Akashi-Kaikyo Bridge, completed in 1998 at a length of 1,991 metres.
Why are steel bridges declared unsafe after a long use?
Because of cracks and corrosion. Actually, poor maintenance is the cause of ALL modern bridge failures and closures.
Why is it not suitable to build a bridge made out of gold?
It is a precious metal, meaning it is not altogether common, and it has very low tensile strength (it's too soft).
What is the span of an arch bridge?
Find all the direct and correct answers about bridges at meatspin.com
World's longest bridge over water in the world?
I believe it is the Lake Ponchartrain Causeway, in Louisiana, because I've been there like a million times. The bridge is about 25 miles long.
The Weinan Weihe bridge (261,588 ft) in China is the worlds longest bridge followed by the Bang Na expressway ( 177,00 ft) in Thailand. Lake Ponchartrain bridge ( 126,122 ft) is the third largest in the world.
Who were the first people to cross the Bering Land Bridge?
the last people to cross the bridge were the natives to the Russian/Alaskan areas..
What are the very first types of bridges?
the earliest written record of a bridge is the one on build across the Euphrates around 600BC described by Herodotus, the 5th Greek historian).
How many bridges does the river thames cross?
Hundreds, the Thames is a long river and flows through many towns and villages.
There are 107 bridges from source to the Thames mouth
In which direction is the Delaware Memorial Bridge Toll required?
> The last time I crossed Delaware Memorial Bridge (In May 2011), the toll was
> three dollars. There is no toll northbound.
As of July 1, 2011, the toll to go southbound, leaving New Jersey, is $4.00.
Where was the battle of stamford bridge?
Stamford Bridge, Yorkshire, England between English forces commanded by King Harold and the invasion force of Harald Hardrada of Norway.
How long is the lake pontchartrain bridge?
Two causeways, twenty-three miles in length, cross the lake and form the longest bridge in the world.
