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General Category => General Discussion => Topic started by: Daniel Kalal on February 25, 2015, 10:51:49 AM

Title: bridges that rely on tension-only elements; don't push on a rope.
Post by: Daniel Kalal on February 25, 2015, 10:51:49 AM
Illinois and Missouri
(http://www.dankalal.net/2014trip17/photo141.JPG)

Iowa and Wisconsin
(http://www.dankalal.net/2014trip16/photo042.JPG)

California
(http://www.dankalal.net/2014trip10/photo287.JPG)

Austria
(http://www.dankalal.net/2013trip23/photo474.JPG)

New Zealand
(http://www.dankalal.net/2005trip11/photo247.JPG)

New Zealand
(http://www.dankalal.net/2011trip1/photo476.JPG)

India
(http://www.dankalal.net/2011trip10/photo105x665.JPG)

Idaho
(http://www.dankalal.net/2003trip2/br081a.jpg)

Denmark
(http://www.dankalal.net/2009trip7/photo440.JPG)

California
(http://www.dankalal.net/1994trip1/chama080.jpg)

Washington
(http://www.dankalal.net/1995trip1/july079x665.jpg)

Colorado
(http://www.dankalal.net/1982trip2/aug004x665.jpg)
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Sasquatch Jim on February 25, 2015, 11:18:38 AM
  How to bridge the gap.
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: oldbike54 on February 25, 2015, 12:13:17 PM
 Thanks Deke , are you coming to Cedar Vale ? Pretty cool old bridge to photograph there .

  Dusty
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: not-fishing on February 25, 2015, 12:40:38 PM
How about the one that was rebuilt a few years ago in Folsom.  It's a bike bridge now. 

(http://3.bp.blogspot.com/-zAoKq_rx-kw/UiIi03kvZpI/AAAAAAAAJVU/utpxbVtXw3M/s640/DSC02240.JPG)

(http://centralcaliforniacycling.com/images/FolsomTrussBridge2.jpg)

The "tension" elements are not cables but the "bike chain" along the bottom of the bridge.  Break one and the whole bridge wants to come down.  That's why they quit building them over a hundred years ago.
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Testarossa on February 25, 2015, 01:30:36 PM
Love this one, the Erasmus Bridge in Rotterdam:
(http://upload.wikimedia.org/wikipedia/commons/6/69/RotterdamMaasNederland.jpg)
Not my photo
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Tobit on February 25, 2015, 01:55:06 PM
Sunshine Skyway, Tampa

Ok, just the center section.  It was the first of this type that I rode a motorcycle across.

(http://floridaphotomatt.com/wp-content/photos/2013/08/Sunshine-Skyway-Bridge-Dawn.jpg)
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: screamday on February 25, 2015, 02:39:41 PM
Sunshine Skyway, Tampa

Ok, just the center section.  It was the first of this type that I rode a motorcycle across.

(http://floridaphotomatt.com/wp-content/photos/2013/08/Sunshine-Skyway-Bridge-Dawn.jpg)

The old Sunshine Skyway bridge was more fun to ride a motorcycle over. The longest metal grate bridge I ever rode on. Great view too as you rode over you could look down into the bay.  :)

(http://upload.wikimedia.org/wikipedia/commons/4/47/Sunshine_Skyway_Bridge_3.JPG)
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: john fish on February 25, 2015, 08:29:01 PM
Probably doesn't match the title, I just thought it was interesting that wood was used as the main support in a fairly modern bridge.


(http://i158.photobucket.com/albums/t111/velofish/11-23-1420ride20011_zps5lix7x1e.jpg)



(http://i158.photobucket.com/albums/t111/velofish/11-23-1420ride20009_zpsqujqfboj.jpg)

Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Ad B on February 26, 2015, 01:49:02 AM
Hi Daniel (and others...),

nice photo's, you're showing here.
In the years I also made a few...
In Rotterdam, the Netherlands:
(https://farm9.staticflickr.com/8641/16463743040_d513f9447e_c.jpg)
Our famous Erasmus bridge (photo taken from our hotel room at the 7th floor...).
(https://farm9.staticflickr.com/8576/16463565868_5fe9707c46_c.jpg)
The bridge in the evening.
(https://farm9.staticflickr.com/8573/16031258833_86d04d7b49_c.jpg)
A bridge in a walking path in the Pyrenees.
(https://farm9.staticflickr.com/8580/16463584078_ac0bcb42c3_c.jpg)
About 250 mtr (820 Ft) deep...
(https://farm9.staticflickr.com/8662/16651173575_f6efeaafa0_c.jpg)
A bridge in the highway, crossing the valley and the river Le Tarn near to Millau, France.
(https://farm9.staticflickr.com/8643/16031264673_1cbc2f5db2_c.jpg)
2,5 km (1.6 Mls) long.
(https://farm9.staticflickr.com/8656/16463583858_bfedcef014_c.jpg)
Took us nearly the whole day and a 50 km (31 Mls) ride (also over dirt roads) to take a lot of these pictures.
My wife wasn't amused anymore at the end of the day...

I like architecture and bridges are a part of that...

Ad B
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Daniel Kalal on February 26, 2015, 08:09:31 AM
Probably doesn't match the title...[/img]

John,
Certainly it matches.  Arch-Suspension bridges are always graceful things.  You don't see the wood ones too often; EnWood structures out of Raleigh, NC specializes in designing and building them.

Here's an often-photographed arch-suspension in Utah.
(http://www.dankalal.net/2014trip10/photo680.JPG)
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Tobit on February 26, 2015, 08:27:05 AM
Old Cooper River bridge demolition after the new Arthur Ravenel Jr. bridge was opened in Charleston SC.  The old one was a scary ride at night, especially in the rain.

Not my pics.

(http://www.jaycashman.com/userfiles/images/cooper_river_bridge.jpg)

(http://images.fineartamerica.com/images-medium-large/ravenel-bridge-glenn-rickborn.jpg)
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: rocker59 on February 26, 2015, 09:20:20 AM
John,
Certainly it matches.  Arch-Suspension bridges are always graceful things.  You don't see the wood ones too often; EnWood structures out of Raleigh, NC specializes in designing and building them.

Here's an often-photographed arch-suspension in Utah.
(http://www.dankalal.net/2014trip10/photo680.JPG)

The contrast of the red rocks against the silver-painted steel really make that bridge at Hite Utah stand out.  It's not that big a bridge, but it's in a dramatic setting!

(http://rocker59.smugmug.com/Motorcycles/Summer-Running-2005/i-C4hNcvJ/0/L/fridaycoloradoriver1-L.jpg)

Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Penderic on February 26, 2015, 09:31:42 AM
Tension? Rope?  ;-T
(http://i1299.photobucket.com/albums/ag77/Penderic/tense%20crossing_zpsdbsxvmwl.jpg)
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: rocker59 on February 26, 2015, 10:06:18 AM
That's kind of nutty!  I'd feel a lot better if there were four logs down for each side!   :o
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: Tobit on February 26, 2015, 01:19:51 PM
Tension? Rope?  ;-T
(http://i1299.photobucket.com/albums/ag77/Penderic/tense%20crossing_zpsdbsxvmwl.jpg)


Darien Gap, Panama?
Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: nikwax on February 26, 2015, 02:32:54 PM
new bridge in Portland, pedestrian/bicycle/train only:

(http://media.oregonlive.com/oregonian/photo/2014/06/15143519-standard.jpg)







Title: Re: bridges that rely on tension-only elements; don't push on a rope.
Post by: john fish on February 26, 2015, 06:05:03 PM
John,
Certainly it matches.  Arch-Suspension bridges are always graceful things.  You don't see the wood ones too often; EnWood structures out of Raleigh, NC specializes in designing and building them.


Thanks, Daniel.  The bridge that I posted isn't far from me in West Virginia and I have to admit that I rode over it many times before I realized that it was wood.  Lovely things, wooden bridges. 

I had to look up Enwoods' web site where I found this lovely thing:

(http://tuggboatsport4.site.nfoservers.com/images/bridgesas0.jpg)