Talk:Cayey Bridge

National Register of Historic Places Low‑importance

	National Register of Historic Places portal This article is within the scope of WikiProject National Register of Historic Places, a collaborative effort to improve the coverage of U.S. historic sites listed on the National Register of Historic Places on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.National Register of Historic PlacesWikipedia:WikiProject National Register of Historic PlacesTemplate:WikiProject National Register of Historic PlacesNational Register of Historic Places articles
Low	This article has been rated as Low-importance on the project's importance scale.

Puerto Rico Low‑importance

	Puerto Rico portal This article is within the scope of WikiProject Puerto Rico, a collaborative effort to improve the coverage of topics related to Puerto Rico on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.Puerto RicoWikipedia:WikiProject Puerto RicoTemplate:WikiProject Puerto RicoPuerto Rico articles
Low	This article has been rated as Low-importance on the project's importance scale.

Bridges and Tunnels Low‑importance

	This article is within the scope of WikiProject Bridges and Tunnels, a collaborative effort to improve the coverage of bridges and tunnels on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.Bridges and TunnelsWikipedia:WikiProject Bridges and TunnelsTemplate:WikiProject Bridges and TunnelsBridge and Tunnel articles
Low	This article has been rated as Low-importance on the project's importance scale.

Articles for creation C‑class

	This article was reviewed by member(s) of WikiProject Articles for creation. The project works to allow users to contribute quality articles and media files to the encyclopedia and track their progress as they are developed. To participate, please visit the project page for more information.Articles for creationWikipedia:WikiProject Articles for creationTemplate:WikiProject Articles for creationAfC articles
C	This article has been given a rating which conflicts with the project-independent quality rating in the banner shell. Please resolve this conflict if possible.
	This article was accepted from this draft on 9 July 2016 by reviewer Tseung Kwan O (talk · contribs).

Girder type[edit]

Can we clarify what the technical details of this bridge are?

As is obvious from the photos, and from the NRHP listing [1], this is not a lattice girder bridge. The lower third of the girder is a solid plate girder instead. That means that it's not a lattice girder, it's a compound of lattice and plate. The lower third is plate, where the main tension forces are, so the lattice part is mostly in compression. That's odd for a lattice truss, they're not strong in compression.

So what is this thing? Is it some peculiarly Belgian design? Belgium, at this period, was quite innovative in bridge designs - especially Arthur Vierendeel, who might have been involved in this (and as a famous Belgian, deserves linking if this can be demonstrated). If compound lattice and plate girders like this are a repeated design, then they deserve specific coverage as such, either in the list of trusses article, with this bridge, or under the article for Nicaise et Delcuve themselves.

It's quite likely that this bridge, lattices being rare, is known as "the lattice girder bridge". But because the mechanics of it are so different from other lattices trusses, we should not confuse the two in a structural sense. Andy Dingley (talk) 14:59, 8 July 2016 (UTC)[reply]