Talk:Truss
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Unless I am very much mistaken, this article is actually about statically determinate trusses. Article needs to make the distinction between this and indeterminate trusses and add analysis techniques for the latter. Cutler 13:55, Aug 7, 2004 (UTC)
The Vierendeel truss description sounds like a ladder. Is this correct? And if so, how does a Vierendeel truss transmit shear loads? --Commander Keane 14:51, 4 Feb 2005 (UTC)
Yes. I looked at the pictures on the Vierendeel web site, and it looked like there were 2 main types:
- "ladder" types -- horizontal top and bottom, connected by periodic vertical members. It looks like it transmits shear loads (which on other trusses are transmitted by diagonal beams or diagonal steel cables) by having wide vertical members and tall horizontal members -- the side of the bridge looks more like a solid sheet of metal with rounded-square portholes cut into it.
- "arch" types -- the top looks like a parabolic arch (although we know it must really be a catenary arch). Strings hang straight down from it to hold the deck, with the strings varying in length just enough to make the deck horizontal. There are no major shear loads.
I think of a truss as being made up of pin-connected struts (therefore having only tension and compression, without having shear). Most real structures have at least some shear, and are not pin-connected, but they're close enough to being a truss that classic truss theory is adequate to analyse them. But the "ladder" type Vierendeel "truss" can't be analyzed by classic truss theory. I would tend to say it is technically not really a truss. But then, what do we call it? A bridge (or any other structure) can be
- a statically determinate truss (no shear)(when external loads are zero, has zero strain),
- a statically indeterminate truss (still no shear)(when external loads are zero, may still have "internal" strain), or
- a _____ (what???), which has shear (which includes these Vierendeel things).
--DavidCary 02:25, 6 Feb 2005 (UTC)
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[edit] styles
I think I'll eventually work on a section about different truss designs such as King Post, Queen Post, Howe, Pratt, Warren, Parket, Petit, etc. Cacophony 20:56, 7 February 2006 (UTC)
[edit] Lighting Trusses
There's also the use of trussing in most stage lighting environments - hanging the cans, lights, etc off lightweight trussing. AMe 12:05, 19 May 2006 (UTC)
[edit] Statics of trusses
The material on verticals and their role in stabilising the compression chord is very unclear as currently written. I'd like to get some time to rewrite this to cover (briefly) the role of the truss web members in carrying global shear, in supporting the lower chord against local bending, and in stabilising the top chord via u-frame action, where top bracing isn't present. One for a rainy day ... Kvetner 23:08, 5 October 2006 (UTC)
[edit] Howe truss
The article Howe truss is a redirect to this page, yet no mention of Howe is given. -- 15:21, 5 January 2007 (UTC)
- I changed the redirect to a better target. --NE2 23:18, 23 September 2007 (UTC)
