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There are many buildings, which were built at the beggining of 20th century. If we consider that duration of concrete steel is 120 years, most of buildings made from that period now is close to it's duration limit. Especially in cities like New York. Practically half of Manhattan is built in that period. Buildings like Woolworth bldg., 40 Wall st., American international building, Empire state building, Chrysler building, and so so many others. What will happen when 120 years expire? All this buildings will come up to duration end at aproximately same time. How are we going to solve this problem? Is it possible to demolish so many so large buildings in such a short period? Consider that up till now largest building that was demolished in Manhattan was Singer building. But it was just one. How are we going to deal with all this buildings? Will Manhattan as well as rest of the modern world face some kind of global urban crisis when it reach duration limit of concrete steel upon which is built?

There is lot of of talk today of global economic crisis, but have anyone thought of possible concrete steel expire crisis which is to come soon?
 

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Liverpool, England.
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I don't think that is a problem. Steel doesn't have a uniform life. It can have a very short life when it is not properly protected in marine locations or polluted atmosphere but, when it is encased inside a building it will last indefinitely.

A few years ago, they had to replace some corner columns on the Chrysler Building as they were in a location where they would be subject to corrosion from the marine atmosphere of New York. However, the main part of the steelwork was fine.

Concrete is an extremely long lasting material. The Roman Pantheon was built of concrete and it is still standing 2,000 years later. Reinforced concrete - where steel bars are embedded in the concrete to give it strength does deteriorate if it is not properly protected - it is similar to steel in that way.

I doubt that buildings in New York or anywhere else are suddenly going to start falling down though.
 
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