Suspension bridges, and cable stayed bridges
I have discussed this at least in passing before .
A suspension bridge such as the first Severn Crossing, above) is a bridge where the towers are connected to each other by cables. (The shape of the arc of the cables is a shape called a "catenary", by the way). The deck is then held up by vertical cables that connect to the main catenary shaped cables. The key point is that the only stresses on the deck are vertical.
A cable stayed bridge (such as the Second Severn Crossing, above) is a bridge where the cables are connected directly from the towers to the deck. If you build a bridge this way, the towers have to hold a lot less weight, and the bridge can be much less massive, and therefore much cheaper to build. However, the stresses on the deck are horizontal as well as vertical, and therefore the deck has to be made out of something stronger than is the case for a suspension bridge. For this reason, it was not practical to make large cable stayed bridges until materials that could withstand greater lateral stress than could traditional materials were developed in the1980s, and this sort of bridge only really became a big deal in the 1990s. However, you now see them everywhere. For the very largest bridges (longer than 1000m) cable stayed bridges are still impractical.
When I was in Normandy over Christmas, I went and saw the Pont de Normandie across the mouth of the Seine connecting Le Havre and Honfleur. I took some photographs, but unfortunately it was an overcast day and the light coloured bridge didn't show up very well. I scanned one of these and was going to post it with yesterday's article, but it wasn't a very good photo so I refrained from doing so. I should have found a photo somewhere else but it was time for bed.
I'm an Aussie presently living in London. This blog normally consists of my random thoughts on a variety of subjects, ranging from politics to telecommunications technology, movies cricket, urban design, beer, cheese, and whatever else comes into my head.
Subscribe to:
Post Comments (Atom)
Blog Archive
-
►
2013
(4)
- ► 09/08 - 09/15 (2)
- ► 09/01 - 09/08 (1)
- ► 02/10 - 02/17 (1)
-
►
2012
(3)
- ► 02/05 - 02/12 (1)
- ► 01/29 - 02/05 (2)
-
►
2011
(20)
- ► 12/25 - 01/01 (1)
- ► 10/16 - 10/23 (1)
- ► 10/02 - 10/09 (2)
- ► 09/25 - 10/02 (1)
- ► 09/04 - 09/11 (2)
- ► 08/14 - 08/21 (2)
- ► 08/07 - 08/14 (1)
- ► 07/31 - 08/07 (1)
- ► 07/24 - 07/31 (1)
- ► 07/17 - 07/24 (1)
- ► 07/10 - 07/17 (2)
- ► 05/08 - 05/15 (1)
- ► 04/24 - 05/01 (1)
- ► 04/03 - 04/10 (1)
- ► 03/13 - 03/20 (1)
- ► 02/20 - 02/27 (1)
-
►
2010
(26)
- ► 12/19 - 12/26 (1)
- ► 12/05 - 12/12 (1)
- ► 10/31 - 11/07 (2)
- ► 10/03 - 10/10 (1)
- ► 09/12 - 09/19 (1)
- ► 08/22 - 08/29 (2)
- ► 07/25 - 08/01 (1)
- ► 07/04 - 07/11 (1)
- ► 05/23 - 05/30 (2)
- ► 05/16 - 05/23 (3)
- ► 04/04 - 04/11 (2)
- ► 03/14 - 03/21 (1)
- ► 03/07 - 03/14 (1)
- ► 02/28 - 03/07 (1)
- ► 02/21 - 02/28 (1)
- ► 02/14 - 02/21 (2)
- ► 01/10 - 01/17 (1)
- ► 01/03 - 01/10 (2)
-
►
2009
(13)
- ► 12/27 - 01/03 (1)
- ► 12/13 - 12/20 (2)
- ► 12/06 - 12/13 (1)
- ► 11/15 - 11/22 (1)
- ► 11/08 - 11/15 (1)
- ► 11/01 - 11/08 (2)
- ► 10/25 - 11/01 (1)
- ► 08/30 - 09/06 (1)
- ► 07/05 - 07/12 (1)
- ► 05/17 - 05/24 (1)
- ► 02/01 - 02/08 (1)
-
►
2008
(27)
- ► 12/28 - 01/04 (1)
- ► 07/20 - 07/27 (1)
- ► 06/29 - 07/06 (1)
- ► 06/22 - 06/29 (1)
- ► 05/18 - 05/25 (4)
- ► 05/04 - 05/11 (2)
- ► 04/27 - 05/04 (2)
- ► 04/13 - 04/20 (1)
- ► 04/06 - 04/13 (1)
- ► 03/30 - 04/06 (5)
- ► 03/09 - 03/16 (2)
- ► 03/02 - 03/09 (1)
- ► 02/24 - 03/02 (1)
- ► 02/10 - 02/17 (2)
- ► 02/03 - 02/10 (1)
- ► 01/27 - 02/03 (1)
-
►
2007
(121)
- ► 12/16 - 12/23 (1)
- ► 11/25 - 12/02 (2)
- ► 11/18 - 11/25 (1)
- ► 11/04 - 11/11 (1)
- ► 10/21 - 10/28 (1)
- ► 10/14 - 10/21 (2)
- ► 09/23 - 09/30 (1)
- ► 09/16 - 09/23 (3)
- ► 09/09 - 09/16 (1)
- ► 08/19 - 08/26 (1)
- ► 08/12 - 08/19 (2)
- ► 07/29 - 08/05 (2)
- ► 07/22 - 07/29 (2)
- ► 07/15 - 07/22 (4)
- ► 07/08 - 07/15 (5)
- ► 07/01 - 07/08 (4)
- ► 06/24 - 07/01 (10)
- ► 06/17 - 06/24 (5)
- ► 06/10 - 06/17 (5)
- ► 06/03 - 06/10 (3)
- ► 05/27 - 06/03 (5)
- ► 05/20 - 05/27 (4)
- ► 05/13 - 05/20 (2)
- ► 05/06 - 05/13 (2)
- ► 04/22 - 04/29 (8)
- ► 04/15 - 04/22 (1)
- ► 04/08 - 04/15 (6)
- ► 04/01 - 04/08 (6)
- ► 03/25 - 04/01 (12)
- ► 03/18 - 03/25 (10)
- ► 03/11 - 03/18 (8)
- ► 01/21 - 01/28 (1)
-
►
2006
(27)
- ► 12/17 - 12/24 (2)
- ► 09/24 - 10/01 (1)
- ► 07/16 - 07/23 (1)
- ► 07/09 - 07/16 (1)
- ► 06/25 - 07/02 (3)
- ► 06/18 - 06/25 (1)
- ► 03/26 - 04/02 (1)
- ► 03/05 - 03/12 (2)
- ► 02/26 - 03/05 (1)
- ► 02/19 - 02/26 (5)
- ► 02/12 - 02/19 (5)
- ► 02/05 - 02/12 (1)
- ► 01/22 - 01/29 (2)
- ► 01/08 - 01/15 (1)
-
►
2005
(117)
- ► 12/25 - 01/01 (1)
- ► 12/18 - 12/25 (1)
- ► 12/04 - 12/11 (1)
- ► 11/20 - 11/27 (1)
- ► 11/13 - 11/20 (1)
- ► 10/30 - 11/06 (2)
- ► 10/23 - 10/30 (1)
- ► 10/16 - 10/23 (7)
- ► 10/09 - 10/16 (1)
- ► 10/02 - 10/09 (4)
- ► 09/25 - 10/02 (4)
- ► 09/18 - 09/25 (2)
- ► 09/11 - 09/18 (4)
- ► 09/04 - 09/11 (5)
- ► 08/28 - 09/04 (3)
- ► 08/21 - 08/28 (2)
- ► 08/14 - 08/21 (2)
- ► 08/07 - 08/14 (1)
- ► 07/31 - 08/07 (2)
- ► 07/24 - 07/31 (1)
- ► 07/17 - 07/24 (5)
- ► 07/10 - 07/17 (2)
- ► 07/03 - 07/10 (2)
- ► 06/19 - 06/26 (1)
- ► 06/05 - 06/12 (1)
- ► 05/29 - 06/05 (3)
- ► 05/22 - 05/29 (3)
- ► 05/15 - 05/22 (1)
- ► 05/08 - 05/15 (1)
- ► 05/01 - 05/08 (2)
- ► 04/24 - 05/01 (2)
- ► 04/17 - 04/24 (5)
- ► 04/10 - 04/17 (2)
- ► 04/03 - 04/10 (2)
- ► 03/27 - 04/03 (3)
- ► 03/20 - 03/27 (5)
- ► 03/13 - 03/20 (2)
- ► 03/06 - 03/13 (6)
- ► 02/27 - 03/06 (3)
- ► 02/20 - 02/27 (2)
- ► 02/13 - 02/20 (2)
- ► 02/06 - 02/13 (3)
- ► 01/30 - 02/06 (2)
- ► 01/23 - 01/30 (3)
- ► 01/16 - 01/23 (3)
- ► 01/09 - 01/16 (2)
- ► 01/02 - 01/09 (3)
-
►
2004
(336)
- ► 12/26 - 01/02 (1)
- ► 12/19 - 12/26 (2)
- ► 12/12 - 12/19 (1)
- ► 11/14 - 11/21 (1)
- ► 11/07 - 11/14 (1)
- ► 10/10 - 10/17 (1)
- ► 10/03 - 10/10 (2)
- ► 09/19 - 09/26 (2)
- ► 09/12 - 09/19 (2)
- ► 09/05 - 09/12 (1)
- ► 08/29 - 09/05 (3)
- ► 08/22 - 08/29 (8)
- ► 08/15 - 08/22 (6)
- ► 08/08 - 08/15 (5)
- ► 08/01 - 08/08 (6)
- ► 07/25 - 08/01 (5)
- ► 07/18 - 07/25 (3)
- ► 07/11 - 07/18 (7)
- ► 07/04 - 07/11 (6)
- ► 06/27 - 07/04 (9)
- ► 06/20 - 06/27 (6)
- ► 06/13 - 06/20 (10)
- ► 06/06 - 06/13 (9)
- ► 05/30 - 06/06 (9)
- ► 05/23 - 05/30 (9)
- ► 05/16 - 05/23 (8)
- ► 05/09 - 05/16 (13)
- ► 05/02 - 05/09 (10)
- ► 04/25 - 05/02 (7)
- ► 04/18 - 04/25 (8)
- ► 04/11 - 04/18 (11)
- ► 04/04 - 04/11 (8)
- ► 03/28 - 04/04 (10)
- ► 03/21 - 03/28 (11)
- ► 03/14 - 03/21 (8)
- ► 03/07 - 03/14 (12)
- ► 02/29 - 03/07 (11)
- ► 02/22 - 02/29 (17)
- ► 02/15 - 02/22 (8)
- ► 02/08 - 02/15 (8)
- ► 02/01 - 02/08 (13)
- ► 01/25 - 02/01 (10)
- ► 01/18 - 01/25 (13)
- ► 01/11 - 01/18 (17)
- ► 01/04 - 01/11 (18)
-
▼
2003
(796)
- ► 12/28 - 01/04 (9)
- ► 12/21 - 12/28 (14)
- ► 12/14 - 12/21 (13)
- ► 12/07 - 12/14 (13)
- ► 11/30 - 12/07 (6)
- ► 11/23 - 11/30 (14)
- ► 11/16 - 11/23 (14)
- ► 11/09 - 11/16 (8)
- ► 11/02 - 11/09 (9)
- ► 10/26 - 11/02 (14)
- ► 10/19 - 10/26 (11)
- ► 10/12 - 10/19 (17)
- ► 10/05 - 10/12 (19)
- ► 09/28 - 10/05 (11)
- ► 09/21 - 09/28 (16)
- ► 09/14 - 09/21 (11)
- ► 09/07 - 09/14 (13)
- ► 08/31 - 09/07 (15)
- ► 08/24 - 08/31 (13)
- ► 08/17 - 08/24 (10)
- ► 08/10 - 08/17 (14)
- ► 08/03 - 08/10 (10)
- ► 07/27 - 08/03 (13)
- ► 07/20 - 07/27 (12)
- ► 07/13 - 07/20 (10)
- ► 07/06 - 07/13 (15)
- ► 06/29 - 07/06 (15)
- ► 06/22 - 06/29 (16)
- ► 06/15 - 06/22 (15)
- ► 06/08 - 06/15 (14)
- ► 06/01 - 06/08 (15)
- ► 05/25 - 06/01 (8)
- ► 05/18 - 05/25 (12)
- ► 05/11 - 05/18 (13)
- ► 05/04 - 05/11 (15)
- ► 04/27 - 05/04 (18)
- ► 04/20 - 04/27 (16)
- ► 04/13 - 04/20 (19)
- ► 04/06 - 04/13 (22)
- ► 03/30 - 04/06 (28)
- ► 03/23 - 03/30 (16)
- ► 03/16 - 03/23 (29)
- ► 03/09 - 03/16 (16)
- ► 03/02 - 03/09 (28)
- ► 02/23 - 03/02 (23)
- ► 02/16 - 02/23 (21)
- ► 02/09 - 02/16 (21)
- ► 02/02 - 02/09 (15)
- ► 01/26 - 02/02 (24)
-
▼
01/19 - 01/26
(22)
- Kerry Packer, one day cricket, and the impact of ...
- Well, he seem to have the worst piece of internet...
- This piece at Wired takes about the schizophreni...
- The good thing about this Economist leader is tha...
- Next time I put up a photo, I will go for one of...
- Dumb Movies and Environmentalism In the 2000 mo...
- I think that "Jay Manifold" sounds like a name tha...
- To state the fairly obvious, the war is about to s...
- Sherlock Holmes and the Anglosphere Andrew Sulli...
- My reaction to the Academy Awards is generally tha...
- Shane Warne is going to retire from one day cric...
- By taking bribes from bookmakers to lose matches, ...
- Suspension bridges, and cable stayed bridges I ...
- Paul Marks over at Samizdata comments that it is...
- Josh Marshall has started following the leads on ...
- This article in the LA Times on food in the US Na...
- Okay, as a further explanation of why the Australi...
- Okay, the blog has been redesigned. Sadly, I think...
- Jay Manifold has a good piece on nanotech. Parti...
- A question to readers Sometimes, when I load th...
- I see also that the Mt Stromlo astronomical observ...
- As an interesting follow up to my comments on the...
- ► 01/12 - 01/19 (13)
- ► 01/05 - 01/12 (18)
-
►
2002
(301)
- ► 12/29 - 01/05 (19)
- ► 12/22 - 12/29 (2)
- ► 12/15 - 12/22 (24)
- ► 12/08 - 12/15 (23)
- ► 12/01 - 12/08 (25)
- ► 11/24 - 12/01 (17)
- ► 11/17 - 11/24 (18)
- ► 11/10 - 11/17 (14)
- ► 11/03 - 11/10 (16)
- ► 10/27 - 11/03 (11)
- ► 10/20 - 10/27 (15)
- ► 10/13 - 10/20 (17)
- ► 10/06 - 10/13 (16)
- ► 09/22 - 09/29 (1)
- ► 09/15 - 09/22 (5)
- ► 09/08 - 09/15 (3)
- ► 09/01 - 09/08 (4)
- ► 08/25 - 09/01 (2)
- ► 08/18 - 08/25 (4)
- ► 08/04 - 08/11 (4)
- ► 07/28 - 08/04 (5)
- ► 07/21 - 07/28 (2)
- ► 07/14 - 07/21 (2)
- ► 07/07 - 07/14 (5)
- ► 06/30 - 07/07 (4)
- ► 06/23 - 06/30 (4)
- ► 06/16 - 06/23 (2)
- ► 06/09 - 06/16 (4)
- ► 06/02 - 06/09 (3)
- ► 05/26 - 06/02 (9)
- ► 05/19 - 05/26 (2)
- ► 05/12 - 05/19 (5)
- ► 04/21 - 04/28 (2)
- ► 04/14 - 04/21 (5)
- ► 04/07 - 04/14 (5)
- ► 03/31 - 04/07 (2)
No comments:
Post a Comment