Talk:Kinzua Bridge

message: I uploaded four pre-destruction shots I had from 2001 at Commons. They are in Category:Kinzua Bridge. IvoShandor 05:16, 4 October 2007 (UTC)
replies: text: I uploaded a photo of the original 1882 construction on Commons at :File:First Kinzua Bridge Construction.jpg. Ruhrfisch  ><>°° 03:18, 21 February 2009 (UTC)
replies: text: There is a new photo courtesy of the Penna. Bureau of State Parks at :File:Phot kinzuabridge2.jpg Ruhrfisch  ><>°° 02:34, 12 May 2009 (UTC)
thread_title: Photos

message: If the official name of the span is "Kinzua Viaduct," why not name the page as such?  It would certainly eliminate a lot of redirects.  Gjs238 11:10, 4 October 2007 (UTC)
replies: text: The Kinzua Bridge was completed in 1882, before the Lethbridge Viaduct. Either way the Kinzua Bridge only held the record for a few years. --​​​​D​​tbohrer​​​​talk•contribs 17:24, 10 October 2007 (UTC)
thread_title:  Page Name 

message: I corrected a statement attributing a shift in center of gravity to the bridge's collapse.  The center of gravity, or center of mass, is a measure of the position of the structure, or equivalently, of the gravitational force on the structure.  As the force of high winds caused the collapse, it is correct to say the structure toppled, or was subject to excessive force/torque due to wind.  I verified that this was the intent of the refered report on the collapse. --Fbfree (talk) 20:48, 12 August 2009 (UTC)
replies: text: Can you provide a source? Maybe I'm not understanding you correctly, but I do not see how the bridge could tip to one side and its center of gravity remain in the same position. ​​​​​​​​Niagara ​​Don't give up the ship 21:20, 12 August 2009 (UTC)
replies: text: The wording of the web page cited originally was Engineers determined that high winds could create lateral pressure on the bridge. The wind hitting the bridge could shift the center of gravity, increasing the weight on one side. Such an event could send the whole bridge crashing to the bottom of Kinuza Gorge. Ruhrfisch  ><>°° 22:44, 12 August 2009 (UTC)
replies: text: I'm with Fbfree on this; the center of gravity doesn't move when the wind starts to blow. Reference 3 (the DCNR note) does indeed say that the CG moves, but this is a sloppy simplification of a complex text; and looks to me like the work of a writer, rather than an engineer, trying to summarise in a few words what the Board of Enquiry says in many pages. The report of the Board does not refer anywhere to the CG. It says 'the weight moves'; which is structural engineer shorthand for 'due to transverse load at height, the vertical loads on the supports at grade alter in the same way AS IF the CG, and hence the line of the pull of gravity, moves'. The article (as we have it now) makes no sense. 86.178.190.225 (talk) 01:37, 18 July 2010 (UTC)
replies: text: OK, I can see what your getting at. Would replacing part of the sentence with something along the lines of "...during high winds, more weight would be placed on the leeward side of the bridge and cause it to fail." be more accurate. ​​​​​​​​Niagara ​​Don't give up the ship 02:04, 18 July 2010 (UTC)

text: The engineering term is "second order analysis", which refers to the effect of forces acting on the structure on the structure in a displaced condition (as opposed to first-order analysis, which assumes the structure to be in its normal position). Ruhrfisch's quote above is a summary of the second-order analysis. Acroterion (talk) 02:14, 18 July 2010 (UTC)
replies: text: Thanks all - could someone who knows about engineering (more than I do) suggest a new sentence or two? Ruhrfisch  ><>°° 03:22, 18 July 2010 (UTC)

text: I confess: I overlooked that reference 3 looks back to an earlier DCNR technical report on the condition of the bridge, not (as I implied above) forward to the report of the Board of Enquiry into its collapse. The earlier (2002?) report is not (I think) in the references, so I don't know whether the text in ref. 3 summarising the report is a correct summary. Thus, for now the simplest way forward, I think, is simply to delete the whole of the sentence 'Engineers had determined that during high winds, the bridge's center of gravity could shift, putting weight onto only one side of the bridge and causing it to fail'. Then, is it worth trying to access the DCNR condition report? It might be interesting. Anecdotal material I've read recently mentions layers of rust flakes on the ground a foot thick . . . 86.178.190.225 (talk) 04:28, 19 July 2010 (UTC)
thread_title:  Center of Gravity 

message: At the end of the Destruction section I changed the panoramic image with an image I recently took of the bridge and wreckage. It got reverted. While the panorama is a fine image, it shows the entire valley and spreads across the article in an ungainly way (my opinion). This image however, shows the bridge proper and more clearly shows the wreckage. (my opinion again) Any other opinions? JBarta (talk) 18:16, 13 July 2011 (UTC)
replies: text: I reverted as, at most, it didn't add anything that panorama didn't. But the image placement was also somewhat awkward (I don't know how it looks on your screen) and somewhat grainy. If a better image of the destroyed section is preferred, I'm considering moving the panorama down to above the "See Also" section and adding this. ​​​​​​​​Niagara ​​Don't give up the ship 19:00, 13 July 2011 (UTC)
replies: text: The image you propose only shows a small portion of the wreckage and doesn't show the bridge at all. For that spot in the article, I think it's a worse choice than the other two. The panorama is certainly a beautiful image, but I would suggest it might head a gallery of images rather than being an inline image in the Destruction section of the article. JBarta (talk) 19:45, 13 July 2011 (UTC)
replies: text: I'm fine with moving the panorama down and replacing it, but your image is nearly identical to it other than not including the right side. Did you take any other photos of the bridge? I do have another that is similiar to yours, except it is a tighter view of the wreckage. I haven't uploaded it yet, but will if you happen to like the photo. You are welcome to email me if you'd like to see it beforehand. ​​​​​​​​Niagara ​​Don't give up the ship 20:43, 13 July 2011 (UTC)
replies: text: I get the impression you would really like to put one of your images in that spot. I'll take that as a cue to let it go. I was simply trying to put in what I thought was a nicer and more suitable image, but I'm not prepared to go round and round over it. I'll bow out and leave it up to you. Use whichever image you think is best. JBarta (talk) 21:20, 13 July 2011 (UTC)
thread_title:  Image of collapsed bridge 

message: *Kinzua Sky Walk opens at historic site
There is also a link at http://www. examiner.com/train-travel-in-national/kinzua-sky-walk-officially-opens-september-15th "Kinzua Sky walk officially opens September 15th" but the examiner website is on the spam blacklist. Ruhrfisch  ><>°° 02:37, 19 September 2011 (UTC)
replies: text: Thanks, for reminding me. Oddly, I had some relatives go the bridge a month before it's official opening and were able to go out onto the deck (had I known of this, I'd have insisted on going and getting new photos). I was able to find the press release from the DCNR and a similiar article from the Kane Republican to use in the article. ​​​​​​​​Niagara ​​Don't give up the ship 16:55, 20 September 2011 (UTC)
thread_title:  Sky walk opened September 15, 2011 

message: The first sentence of this section (Nick Kovalchick, the owner of the salvage company, could not bear to dismantle the bridge) was a bit confusing when jumping directly from the lead section.  Have edited to make it more clear at the risk of possibly seeming redundant.
--Coconutporkpie (talk) 07:33, 20 November 2014 (UTC)
thread_title: State park section intro 

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thread_title:  External links modified