e12015 Timber roof russ - Wikipedia, the free encyclopedia Timber roof truss From Wikipedia, the free encyclopedia A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. Trusses usually occur at regular intervals, linked by longitudinal timbers such as purlins. The space between cach truss is known as a bay.) Timber roof trusses were a medieval development. Earlier roofs had been supported by coupled rafters — pairs of rafters linked by horizontal beams. But such roofs were structurally weak, and lacking any Jongitudinal support were prone to racking, a collapse Two King post trusses linked to support a roof resulting from horizontal movement, Key:1: ridge board, 2: purlins, 3: common rafters. This is an example of a "double roof" with principal rafters and common rafters, Contents = 1 History 2 Closed trusses = 2.1 King post truss = 2.2 Queen post truss = 23 Liegender Stuhl 3 Open trusses = 3.1 Arch-braced truss = 3.2 Hammerbeam truss = 3.3 Scissor truss 4 See also 5 References 6 External links History The top members of a truss are known generically as the top chord, bottom members as the bottom chord, and the interior members as webs. In historic carpentry the top chords are often called rafters, and the bottom chord is an often a tie beam. There are two main types of timber roof trusses: closed, in which the bottom chord is horizontal and at the foot of the truss, and open, in which the bottom chords are raised to provide more open space, also known as raised bottom chord trusses. 1 Closed trusses itp er wikipedia orghilTimber. roo truss Wee12015 Timber roof russ - Wikipedia, the free encyclopedia The terms closed truss and open truss are used in two ways to describe characteristies of truss roofs, Closed truss: 1) A truss with a tie beam; 2) a roof system with a ceiling so the framing is not visible. Open truss: 1) A truss with an interrupted tie beam or scissor truss which allow a vaulted ceiling area; 2) Roof framing open to view, not hidden by a ceiling. King post truss A king post truss has two principal rafters, a tie beam, and a central vertical king post.[5] The simplest of trusses, it is commonly used in conjunction with two angled struts. The king post is normally under tension, and requires quite sophisticated joints with the tie beam and principal rafters. Ina variation known as a king bolt (rod) truss the king post is replaced by a metal bolt (rod), usually of wrought iron. King post truss, Key: I: King post, 3: principal raflers, 4: struts, tie beam, Queen post truss A queen post truss has two principal rafters and two vertical queen posts.!5! The queen post truss extends the span, and combined with spliced joints in the longer members extends the useful span for trusses of these types. As with a king post, the queen posts may be replaced with iron rods and thus called a queen rod truss. This truss is often known as a palladiana (Palladian truss) in Italy, as it was frequently used by the Venetian architect Andrea Palladio.{5ll@] Sometimes a palladian truss is defined as a compound truss with a queen post and king post truss in the same assembly |7] Queen post truss. ‘The queen post truss and the king post truss may be combined, by Key: 1: Queen posts, 2: tie beam, using the straining beam of the queen post truss as the tie beam for a 3: straining beam, 4 principal king post truss above.!*] Such combinations are known as compound rafters. trusses. Liegender Stubl Liegender stuhl is a truss of German origin, the German name is used in America. This truss is found in some 18th and 19th-century buildings where Germans settled in the U.S. The literal translation is "lying chair", lying meaning the top chords are angled or leaning and chair in the sense of a support, in this case a tpt wikipedia orghhi/Timber. roots 26e12015 Timber roof russ - Wikipedia, the free encyclopedia post or truss.!°! Carpenters in the Netherlands also used this truss where it is spelled liggende stoe!.!11 German illustration of a purlin roof with liegendem stuhl truss highlighted in blue Open trusses Arch-braced truss Lacking a tie beam,!""! the arch-braced (arched brace)|'2I truss gives a more open look to the interior of the roof. The principal rafters are linked by a collar beam supported by a pair of arch braces, which stiffen the structure and help to transmit the weight of the roof down through the principal rafters to the supporting wall. A double arch braced truss!!2] has a second pair of arched braces lower down, from the rafter to a block or inner sill: This form is called a wagon, cradle, barrel or tunnel roof because of this cylindrical appearance.|!3] A single arch-braced truss, Key: 1: principal rafters, 2: collar beam, 3: arch braces. Hammerbeam truss ‘The hammerbeam roof was the culmination of the development of the arch-braced truss, allowing greater spaces to be spanned. The hammerbeam roof of Westminster Hall in London, designed by Hugh Herland and installed between 1395 and 1399, was the largest timber-roofed space in medieval Europe, spanning a distance of just over 20 metres (66 ft).!'41 It is considered to be the best example of a hammer-beam truss in England_!!5] tpt wikipedia orghhi/Timber. roots 36e12015 Timber roof russ - Wikipedia, the free encyclopedia Hammer beam trusses can have a single hammerbeam or multiple hammerbeams. A false hammerbeam roof (truss) has two definitions: 1) There is no hammer post on the hammer beam!'61l7] as sometimes found ina type of arch brace truss!!8! or; 2)The hammer beam joins into the hammer post instead of the hammer post landing on the hammer beam_!91 Chambers 1908 single hammerbeam truss Scissor truss The scissor truss gets its name from being shaped like a pair of shears (scissors). Two defining features of a scissor truss are: 1) the joint where the bottom chords pass (the hinge of a pair of scissors) must be firmly connected and 2) the rafter (top chord) feet must land on the bottom chords. If the bottom chords join to the under-side of A scissor truss the top chords the assembly is said to be "scissor braced"4) rather See also = Timber framing = Truss bridge = Reciprocal frame = Bent (structural) References tpt wikipedia orghhi/Timber. rootse12015 Timber roof russ - Wikipedia, the free encyclopedia Notes a. The palladiana had been used in Italy for many years before Palladio's time, but has been given his name because of its extensive use in the buildings he designed.!*1 Citations 1. Curl, James Stevens (2006), "truss", A Dictionary of Architecture and Landscape Architecture (http://www. oxfordreference. com/views/ENTRY_html?subview=Main&entry=t].e4819) (online ed.), Oxford University Press, retrieved 1 December 2012 (subscription required) 2. Steane (1984), p. 196 3. Lewandoski, Jan, Jack Sobon, and Kenneth Rower. Historic American roof trusses. Becket, MA: Timber Framers Guild, 2006. 48. ISBN 0970664346 4. Domestic Buildings Research Group (Surrey, England), http://www. dbrg.org, uk/GLOSSARY/Open?%20truss, htm! 5. Glossary of Australian Building Terms — Third Edition (NCRB) 6. Valeriani, Simona (August 2006), "The Roofs of Wren and Jones: A Seventeenth-Century Migration of Technical Knowledge from Italy to England”. Working Papers on the Nature of Evidence. How Well Do ‘Facts’ Travel?", (PDF), Department of Economic History, London School of Economies utp /eprints, Ise. ae, uk/22534/1/1406Valerianipdf, retrieved 22 December 2012 Missing or empty |titie= (help) 7. Proceedings of the Third Annual Congress on Construction History, May 2009, Figure 1, based on Sachero, C., 1864: Sulla stabilita delle armature dei tetti. Giornale del Genio Militare 2, 250 http://www. bma arch. unige.it/PDF/CONSTRUC TION_HISTOR Y_2009/VOL3/TURRI- ‘Zamperin_Cappelletti_1_paper-revised_layouted.pdf accessed 12/24/2012 8. Yeonrans (2003), p. 42 9. Anderegg. Jean, Holzbaukunst: Fachwerk, Dachgertist, Zimmermannswerkzeug : systematisches Fachworterbuch Architecture en bois : construction en pan de bois, charpente de toit, outils du charpentier : dictionnaire spécialisé et systématique = Architecture in wood : timber-frame construction, roof frame, carpenter's tools specialized and systematic dictionary. Munich: K.G. Saur, 1997. : 65. ISBN 3598104618 10. Herman Janse, Houten kappen in Nederland 1000-1940, Delftse Universitaire Pers, Delft / Rijksdienst voor de Monumentenzorg, Zeist 1989. LI. Harris (2003), pp. 75-77 12. Chappell, Steve. A timber framer's workshop: joinery, design & construction of traditional timber frames Brownfield, Me.: Fox Maple Press, 1998. 115. Print. 13. Whewell, William, and F. de. Lassaulx. Architectural notes on German churches; with notes written during an architectural tour in Picardy and Normandy... The 3d ed. Cambridge: J. and J.J. Deighton; [ete.], 1842. 44. Print. 14. Steane (1984), pp. 196-97 15. Webber, Frederick G.. Carpentry & Joinery. Methuen and Co., London: 1898, 152. 16. Davies, Nikolas, and Erkki Jokiniemi, Dictionary of architecture and building construction. Amsterdam: Elsevier/ Architectural Press, 2008. 144, 17. Alcock, N. W... Recording timber-framed buildings: an illustrated glossary. London: Couneil for British Archaeology, 1989. 18, Sharpe, Geoftiey R.. Historic English churches a guide to their construction, design and features. London: 1B. Tauris, 2011, 111, fig. 61 19. Wood, Margaret, The English Mediaeval House. London: Ferndale Editions, 1980, 1965. 319. 20. Lewandoski, Jan, Jack Sobon, and Kenneth Rower. Historic American roof trusses. Becket, MA: Timber ramers Guild, 2006. 7. ISBN 0970664346 Bibliography = Harris, Richard (2003), Discovering Timber-framed Buildings, Shire Publications, ISBN 978-0-7478- 0215-0 = Steane, John (1984), Archaeology of Mediaeval England and Wales, Croom Helm, ISBN 978-0- itp er wikipeciaorghiilTimber roots 88e12015 099-2385-5 = Yeomans, David T. (2003), The Repair of Historic Timber Structures, Thomas Telford, ISBN 978-0- 7277-3213-2 Timber roof russ - Wikipedia, the free encyclopedia External links = Illustrated roof glossary (http://vww. builderbill-diy-help.com/roof-glossary.html) Retrieved from "https://en. wikipedia.org/w/index. php title=Timber_roof_truss&oldid=662727307" Categories: Architectural elements | Roofs | Timber framing = This page was last modified on 17 May 2015, at 06:55 = Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. itp er wikipedia orghilTimber. roo truss