Posted by admin | Posted in Uncategorized | Posted on 01-06-2010
Tags: bridge, bridges, bridge_crane, building, girder bridge, girder bridge advantages, girder bridge example, girder bridge facts, girder bridge model, toys
Girder Bridge
A little help of how to do these would be nice?
I’m not looking for an answer as much as how you would go about doing these questions. It seems I’m going in circles.
A ski lift takes a skier up a slope at 50 m/min. The skier then skis down the slope at 150 m/min. If a round trip takes 24 min, how long is the slope?
In the design of a bridge, an engineer determines that four fewer 18-m girders are needed for the span length than 15-m girgers. How many 18-m girders are needed?
Wow that was really simple and well put. I can’t believe I have been overlooking stuff that is just so easy; maybe I should put the book down for a bit. You must have been a great teacher back in your day =) Thanks for the help!
First – rate problem
Distance = speed x time
Let x represent the time going up in minutes
Then 24 – x represents the time going down
Distance is the same up and down
50x = 150(24 – x)
Solve
Length of span is the same for both types.
Let x represent the number of 18m girders
Then x + 4 represents the number of 15m girders
18x = 15(x + 4)
Solve
Hope this helps you to the right answers.
Girder Bridge
Freight Forwarding in Denmark – How the Oresund Bridge Connects Denmark and Sweden
Denmark is an important centre for international freight and it is therefore not surprising that it is home to a remarkable feat of engineering that has been a significant boost to the efficiency of freight forwarding between Denmark and Sweden. The Oresund Bridge is the longest combined rail and road bridge in Europe. The bridge combines two track railway and a four lane road bridge-tunnel across the Oresund strait. The bridge connects the two main cities in the area – Copenhagen in Denmark and Malmo in Sweden. The international route E30 runs across the bridge and through the tunnel. This is clearly a huge benefit for freight companies, which can now make the crossing faster then previously.
The Oresund Bridge was designed by the Danish architects, Dissing and Weitling and they designed it with a clear eye on the impact it would have for shipping companies. As the crossing actually includes a bridge, a tunnel and an island, it is sometimes more accurately called the Oresund Link or Oresund Connection, rather than the Oresund Bridge.
The structure weighs 82,000 tonnes and supports the two railway tracks beneath four road lanes in a horizontal girder, supported every 140 metres by concrete piers. The 490 metre cable-stayed main span is the longest of the type in the world. The two pairs of free standing cable supporting towers are 204 metres, allowing shipping 57 metres of headroom to pass underneath. Even so, many a shipping company prefers its ships to pass through the Drogden Strait above the Drogden Tunnel instead.
Although it crosses the border between Denmark and Sweden, an agreement called the Schengen Agreement means that there are no passport controls. This is a big benefit for freight companies. There are often customs checks at the toll booths in Sweden for those entering Sweden but not for those entering Denmark, again improving the efficiency of freight forwarding.
Construction of the Oresund Bridge started in 1995 and was completed in 1999. At first, the crossing was not used as much as expected, most likely due to the high cost of the tolls. However, traffic increased markedly in 2005 and 2006. In 2007, nearly 25 million people travelled over the bridge.
The Drogden Tunnel connects the artificial island of Peberholm and Kastrup, the nearest part of Denmark. The 4050 metre long tunnel includes a 3510 metre undersea tunnel and 270 metre entry tunnels at each end. The tube tunnel is made from twenty concrete segments, which at 55,000 tonnes each are the biggest prefabricated concrete segments in the world. The reason for building a tunnel instead of just another section of bridge is to avoid obstructing aircraft from Copenhagen Airport and to provide a clear section where shipping can pass. Again, the requirements of the freight services industry have been fully taken into account in the way the bridge has been designed.
Passenger trains operate every twenty minutes over the crossing during the day and once an hour in the night in both directions, as well as a considerable number of freight trains to support the freight transport industry. The rail section is in double track standard gauge and capable of high speeds up to 200 km/h, making freight transport streamlined and fast.
The cost of the Oresund bridge has been calculated at DKK 30 billion, with the cost of the bridge paid back by 2035. Sweden has also started building the Malmo City Tunnel as a new rail connection to the bridge, which will be ready in 2011.
The Oresund Bridge is already a huge boost to the efficiency of freight transport to and from Denmark and this further development will increase its importance still further.
About the Author
Stephen Willis is Managing Director of
RW Freight Services
a UK based freight transport company, established in 1971 and operating worldwide freight forwarding services including specialist freight services to and from
Denmark
The Great Gatsby: What does “non-olfactory money” mean?
“Over the great bridge, with the sunlight through the girders making a constant flicker upon the moving cars, with the city rising up across the river in white heaps and sugar lumps all built with a wish out of non-olfactory money. The city seen from the Queensboro Bridge is always the city seen for the first time, in its first wild promise of all the mystery and the beauty in the world.”
Non-olfactory money would literally mean “money that can’t smell”.
But, what is it’s figurative meaning?
Thank you!
The city is being described at it’s most idealistic, as if from the eyes of someone just seeing it for the first time, seeing only the shining possibilities of it and none of the ugly realities.
So you could functionally interpret “non-olfactory” here to mean without the stink of corruption and greed or other tainted realities.
Poetically, in a city “built with a wish,” non-olfactory money would be a gleaming investment from a pure heart.
Aireside Girder Bridge.mpg
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