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[POPULAR MECHANICS] How Fragile are Americas Bridges? - Page 7

post #61 of 89
Well at least I don't have to worry about sink holes...
Glad I don't have to go into D.C.

http://www.youtube.com/watch?feature=player_detailpage&v=u3yCfu-H_64#t=101s
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post #62 of 89
You don't know about sink holes (or pot holes) until you move to the UK.

There are more pot holes than roads.
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post #63 of 89
Quote:
Originally Posted by Tsar View Post

You don't know about sink holes (or pot holes) until you move to the UK.

There are more pot holes than roads.

I was there twice, Bristol area and up by the Highlands. Roads were pretty decent honestly.
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post #64 of 89
Quote:
Originally Posted by zeiferlance View Post

yep. amen to that. a good example is the country where my taxes go.
i've never imagined things like this happens to the US

Pretty sure 1/2 of it goes to U.S. foreign aid.
Quote:
Originally Posted by Tsar View Post

You don't know about sink holes (or pot holes) until you move to the UK.

There are more pot holes than roads.

Same in the US just depends where you live because the roads suck where I live mad.gif
Edited by USFORCES - 6/3/13 at 12:42pm
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post #65 of 89
Around here they do manage to fill the potholes. About once a year they get closed up. Then springtime comes around and they're all gaping death traps again. But at least this way we all know where they're at.
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post #66 of 89
Quote:
Originally Posted by USFORCES View Post

Pretty sure 1/2 of it goes to U.S. foreign aid.
Same in the US just depends where you live because the roads suck where I live mad.gif

Funding depends on type of Road and state/county.
Interstates are federally funded, intrastates are state funded, and county roads... are county funded tongue.gif
Many roads receive state aid if they are county, such as major roads, and some are only county funded, such as in Fairfax County VA, which found it was better able to maintain their own roads instead of waiting on V-Dot, not all roads but some.

It is basically a giant cluster ball where some roads are excellent and some are always in a state of repair.
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post #67 of 89
Quote:
Originally Posted by un-midas touch View Post

Around here they do manage to fill the potholes. About once a year they get closed up. Then springtime comes around and they're all gaping death traps again. But at least this way we all know where they're at.

Same in the UK.

They make a rubbish attempt to fill them in but the next time it rains you end up with massive gaping hole that looks like a land mine went off.

Also they are literally death traps for cyclists: http://www.express.co.uk/news/uk/379627/Cyclist-dies-after-bike-hits-pothole
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post #68 of 89
Quote:
Originally Posted by GingerJohn View Post

Right up to the point where a major incident occurs, then it is all "You incompetent engineers, why didn't you tell us?"

Been there, done that. Thankfully no-one died and we had all our warnings well documented.

Same here. No one hurt but quite a bit of money was lost.
Quote:
The problem with the "safe zone" is, as you mention at the end of your post, people don't understand it. Something lasts longer than its predicted life span, that means it is never going to fail...

Safe life, factor of safety and so on are often misunderstood by non-technical people. It is kind of like best before dates on food - sure the food is most likely perfectly edible after that date, but it marks the point at which the risks of food poisoning start to become unacceptable.

Well said. The entire concept seems straightforward to me but for the most part people just stare at me blankly while explaining it. I have actually been part of a group where we were asked at what point in time exactly something would begin to fail and what would happen when it started. We told them we needed a bigger budget for a time machine. People see something that looks perfectly fine even though it is past its expected life span and think oh it is fine and it very well could be. That life span is the point at which I no longer will be held responsible for what happens. It may or may not be perfectly fine but I will not take that risk and I don't think anyone else should either.

BTW your waterhammer sounds intriguing. Friends of mine in Atlanta would love something like that. That system is a mess as well.
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post #69 of 89
Quote:
Originally Posted by Kylepdalton View Post

BTW your waterhammer sounds intriguing. Friends of mine in Atlanta would love something like that. That system is a mess as well.

Little bit more reading for you:

Wired - Engineers analyse pressure waves to pinpoint leaky water pipes
Prof. Beck was my supervisor.

Leak Detection Using Pressure Transients (PDF)

Nothing too in depth, although you can probably look up the paper listed if you are interested.
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post #70 of 89
Sounds a little like sonar.
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