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The Global ETD Search service is a free service for researchers
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Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 11 (0.036 seconds)Spelling suggestions: "subject:"mortise"" "subject:"tortise""
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Tensile, moment, and torsional resistance evaluation and prediction of mortise-and-tenon joints in wood-based compositesTu, Can 07 August 2010 (has links) (PDF)
This study was performed to characterize and understand static loading capacities of the T-shaped, end-toace, mortise-and-tenon joints in pine plywood and oriented strandboard (OSB), and to develop mechanical models to predict its tensile, moment, and torsional resistance capacities. Results of the study indicated that the tensile resistance of a stapled-and-glued mortise-and-tenon joint in pine plywood and OSB ranges from 505 to 1933 lb. and 306 to 845 lb., respectively; the moment resistance ranges from 780 to 4428 lb.-in. and 612 to 2309 lb.-in., respectively; and the torsional resistance ranges from 598 to 2292 lb.-in. and 439 to 1260 lb.-in., respectively. The mechanical models proposed in this study were experimentally validated. The tensile, moment, and torsional resistances of a T-shaped, end-toace, stapled-and-glued, mortise-and-tenon joints can be estimated based on knowing basic material properties of single-staple tensile, lateral shear resistance, and material end-toace glue bonding tensile strength and shear strength.
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Hull Remains from the Pabuç Burnu Shipwreck and Early Transition in Archaic Greek ShipbuildingPolzer, Mark Edward 2009 August 1900 (has links)
In 2002 and 2003, the Institute of Nautical Archaeology excavated the remains of an East Greek ship that sank off the coast of Pabuç Burnu, Turkey, sometime in the second quarter of the sixth century B.C. The scant remains of the vessel’s hull have provided the first archaeological evidence for laced shipbuilding in the Aegean. The diagnostic features preserved in the hull fragments are consistent with those of Greek laced construction, as evidenced in other shipwrecks from the same period found in the western Mediterranean. The planking joinery included edge inserts, or coaks, between the planking strakes and ligatures laced through oblique holes drilled along the sides of the planks through tetrahedral notches. The ship’s framing consisted of pre-fashioned made-frames alternating, on the upper sides of the hull, with top-timbers. The frames had trapezoidal sections, were notched over the planking seams on their underside, and were lashed to the hull. The top-timbers had rectangular sections and were both lashed and treenailed to the planking. Notable in this vessel’s construction is the use of tenons as coaks in its original construction, the earliest example of tenon usage in Greek shipbuilding. The hull’s construction features are virtually identical to those of the Cala Sant Vicenç wreck in Majorca, and mostly similar as well to those of wreck 1 at Gela. The Pabuç Burnu and Cala Sant Vicenç ships are further similar in the use of traditional cylindrical dowel coaks for making repairs to the hull, wherein they are inserted obliquely along one side through the face of the replacement plank. These features testify to a critical phase in Greek shipbuilding when tenons replaced dowels as coaks in laced construction, paving the way for the eventual supplanting of lacing by pegged mortise-and-tenon joinery. Furthermore, examination and comparison of numerous construction details of these and other Greek shipwrecks from the sixth through fourth centuries B.C. suggest that mortise-and-tenon technology could have evolved naturally within the Greek tradition of laced construction, rather than being incorporated directly from some foreign—most likely Phoenician—shipbuilding method.
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The Cairo Dahshur boatsCreasman, Pearce Paul 25 April 2007 (has links)
Excavations conducted in A.D. 1894 and 1895 by French archaeologist Jean-
Jacques de Morgan at the funerary complex of the ancient Egyptian Middle Kingdom
pharaoh Senwosret III on the plain of Dahshur revealed some unparalleled finds which
included five or six small boats. These boats provide a unique opportunity in nautical
archaeology—to study contemporaneous hulls. Today, only four of the "Dahshur boats"
can be located with certainty; two are in the United States, one in the Carnegie Museum
of Natural History in Pittsburgh and one in the Field Museum of Natural History in
Chicago. The remaining two are on display in The Egyptian Museum, Cairo.
Since their excavation these boats remained relatively inconspicuous until the
mid-1980s when a study of the two hulls in the United States was conducted. However,
the two boats in Cairo remained largely unpublished.
This thesis combines personal observation and recording of the Cairo boats over
two summers to reveal more unique characteristics of the hulls and will facilitate a future
study of the group as a whole. Each boat is discussed individually and is further divided
into its major components by order of construction.
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The Cairo Dahshur boatsCreasman, Pearce Paul, January 1900 (has links)
Thesis (M. A.)--Texas A&M University, 2005. / "Major Subject: Anthropology" Title from author supplied metadata (automated record created on Apr. 27, 2007.) Vita. Abstract. Includes bibliographical references.
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Lateral Strength and Ductile Behavior of a Mortise-Tenon Connected Timber FrameKouromenos, Alexandros 01 March 2017 (has links)
The primary goals of this project were to examine the amount of lateral force resisted by a single-bay mortise-tenon connected timber moment frame, and to introduce ductile behavior into the mortise-tenon connections by adding a steel sleeve around a traditional wood peg. This research aimed to provide proof that traditional timber frames are capable of ductile racking while reliably complying with ASCE 7-10 building code drift speci! cations, implying an increase in the ASCE 7-10 ductility factor (R) for wood frames when used as lateral force resisting elements. A secondary goal was to promote traditional heavy timber framing as a main structural system. Modern structural framing is dominated by light-wood, steel, and concrete framing. The exploration in this project aspires to demonstrate that heavy timber frames can achieve comparable lateral performance and frame behavior to other current lateral systems, reassuring the reliability of traditional timber frames.
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Stark, starkare, starkast : en jämförelse av fasta tappar och centrumtappar med utgångspunkt i tappens dimensioner, inpassning, komprimering, antal och limning / Optimizing the stability : an investigation of tenon and dowel joints regarding their dimensions, fitting, compression, number and glueingBerglund, Jonas January 2018 (has links)
I mitt examensarbete jämför jag styrkan för sammanfogningar i trämöbler med fasta tappar och centrumtappar utifrån fem parametrar: tappens dimensioner, tappens inpassning, tappens komprimering, tappens antal och tappens limning. Den övergripande frågan har varit, ”är fasta tappar eller centrumtappar starkast?” Målet har varit att sålla i olika teorier rörande dessa två typer av sammanfogningar och skapa ett underlag i syfte att hjälpa möbelsnickare och formgivare att kunna ta medvetna beslut vad gäller sina val av dessa typer av sammanfogningar. Genom litteraturstudier och verkstads besök har jag samlat kunskap som ligger till grund för det hållfasthets test jag sedan gjort i materiallabbet på Linköpings universitet. Testet har utgått från ett scenario där en stols bakben ska fogas samman med en sarg. Testet visar, utifrån ett antal angivna avgränsningar, att fasta tappar utan undantag är starkare än centrumtappar.Det visar också att en dubbel fast tapp fördelar belastningen bättre än en enkel fast tapp och bidrar till en betydligt starkare fog. För c-tappar gäller generellt att ökat antal tappar ökar fogens seghet men inte nödvändigtvis maxbelastningen. Inpassning och komprimering har betydelse för hur seg en fog är. / I have in my thesis compared the strength of mortise and tenon joints and dowel joints in wooden furniture. I´ve made the comparison based on five parameters: the dimensions of the tenon or dowel, the fit of the tenon or dowel, the compression of the tenon or dowel, the number of tenons or dowels and the gluing of the tenon or dowel. The bigger question has been, “is the mortise and tenon joint or the dowel joint the strongest?” The goal has been to go through different theories regarding these two types of joinery and making a foundation to help cabinet makers and designers to make conscious decisions regarding their choices of these two types of joinery. Through studies of literature and visiting workshops I´ve gathered knowledge that lies as a foundation for a test of strength of different joinery made in the material testing facility of Linköping University. The test was based on a scenario of joining the back leg and side rim of a chair. The test shows, from the given definitions, that mortise and tenon joints are without exceptions stronger than dowel joints. It also shows that double tenons better will distribute the load and make for a stronger and tougher joint. Dowel joints will get tougher with an increased number of dowels but it will not necessarily make for a stronger joint. The fit and compression of the tenon or dowel will affect the joints strength.
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Mekanisk prestanda hos traditionella träfogar kontra samtida byggbeslag / Mechanical performance of traditional wood joints compared to contemporary steel fastenersDahl, Arvid, Lindström, Charlie January 2018 (has links)
Samhället efterfrågar idag i allt högre grad miljövänlig och hållbar byggnation. Ett sätt möta dessa nya krav på miljövänlig byggnation är att använda mer trä då detta minskar koldioxidutsläpp genom substitutionseffekten. Syftet att undersöka huruvida traditionella fogningstekniker som helt utförs i trä kan ersätta samtida fogar i framtida byggnation. Målet är att visa att detta är möjligt ur hållfasthetssynpunkt. Undersökningen kommer att begränsas till att undersöka en pelar-balk-anslutning där den traditionella fogen representeras av tre olika varianter tapp i tapphålsfog och den samtida av balksko. Fogarna undersöks beräkningsmässigt samt genom försök där belastningsfallet ämnar ge en hög tvärkraft. Resultaten pekar på att det är möjligt att introducera den undersökta traditionella träfogningstekniken vid samtida byggnation. / Societies demand for environmentally friendly and sustainable construction is ever increasing. One way to meet these new demands on environmentally friendly construction is to use more wood which decreases carbon emissions through the substitution effect. This report aims to research whether traditional joinery techniques entirely executed in wood can replace contemporary joinery techniques in future construction. The goal is to show whether this is possible from a strength standpoint. The research will be limited in that it will strictly seek to study a pillar-beamconnection where the traditional joint researched will be three varying mortise and tenon joints and the contemporary joint is a joist hanger. The joints will be analyzed with calculation and experimentation where the load case aims to produce mainly shear in the joint. The results point towards it being possible to introduce this traditional joint in contemporary construction.
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Gestaltning och dimensionering av metallfria knutpunkter / Design of non-metallic timber connectionsAl-saadi, Mohammed, Hilal, Marwa Abdulnasir Hilal January 2020 (has links)
This thesis aims to develop knowledge of non-metallic connections in order to develop and change the Swedish wood architecture as well as wood structures. The main question being "Are metal-free connections suitable for contemporary timber buildings?". In the theory chapter, facts about wood are introduced, followed by literature studies and previous research. Through literature research in the university database and conducting interviews with an architect, a designer and a carpenter, data was collected for the design process and for the calculation of the dimensions for one of the selected glulam connections. The result showed that there is a lack of knowledge in Sweden regarding non-metallic connections, other countries such as Switzerland are more developed in the area and has accepted the idea of this concept. The result also showed that the lack of strength in wooden connections lead to large dimensions of the timber elements, but an aesthetic advantage can be developed. Finally, the results are discussed and analyzed according to the different requirements set on appearance, durability and manufacturability. / Detta examensarbete syftar till att utveckla kunskap om metallfria knutpunkter för att möjliggöra en mer varierad svensk träarkitektur. Den övergripande frågan har varit ”Hur väl lämpar sig metallfria knutpunkter för nutida byggande av träkonstruktioner?”. I teorikapitlet beskrivs fakta om materialet trä, följt av beskrivning av litteratur och tidigare forskning som är relevant för denna studie. Genom en litteraturstudie via universitetets databaser samt intervjuer med en arkitekt, en konstruktör och en möbeldesigner samlades data för gestaltningsprocessen och dimensionering av en knutpunkt i limträ. Resultatet visade att det finns kunskapsbrist i Sverige gällande metallfria knutpunkter, andra länder som Schweiz är mer utvecklade inom området samt har accepterat tanken på detta koncept. Resultatet visade även att frågor kring hållfasthet leder till stora dimensioner för de ingående träelementen, men att en estetisk fördel kan utvecklas. Slutligen diskuteras och analyseras resultaten utefter olika krav som ställts på utseende, hållfasthet och tillverkning.
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Phoenician ships : types, trends, trade and treacherous trade routesSmith, Anne Marie (Biblical archaeologist) 11 1900 (has links)
Phoenician ships in the broadest sense of the word are the focus of this dissertation
and it encompasses the entire period of both Phoenician and Punic seafaring. The
study is quantitative, largely historical and archaeological, with the use of secondary
sources as well as iconography. The origins of the Phoenician construction technique,
the mortise-and-tenon joints, are investigated as well as the various types of
Phoenician ships. These are analysed under the headings Merchant ships, Warships
and Utility ships.
The materials mentioned in Ezekiel’s prophecy about ‘The Ship Tyre’, are analysed,
whether they fit the purpose for which they are mentioned. The production process of
purple cloth with the use of Murex molluscs is described in detail including an analysis
of the boats used to catch the molluscs.
The possibility is investigated of whether the Ashkelon Dog Burials could be related to
the Phoenician trade in dogs, and whether they could have served as ship dogs.
Lastly the difficulties encountered in sailing through the narrow sea straits of the
Mediterranean Sea are described, which are subject to Internal waves, affecting the
surface water. / Old Testament & Ancient Near Eastern Studies / M. A. (Biblical Archaeology)
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En studie av skador hos stolar från renässansen 1560-tal till biedermeier 1850-tal. : Ett arbete om sambandet mellan konstruktion, material och skadebild.Brolin Nord, Elin January 2018 (has links)
Through the selection of six representative typical Swedish chairs from each era, I present manufacturing techniques and how the craftsmanship has affected the style of the chairs over time. My main source material is the objects themselves. I chose to analyze the constructions and what can distinguish them apart in techniques, material choices, aesthetics and design. The main part of my work has been to find out what are the most occurring damages and its causes. Most damages from renaissance to biedermeier can be linked to the mortise joint. Through interviews with experienced conservators and with my own experiences as a cabinet maker and conservator, I discuss the concept of the ultimate chair design in terms of stability. I have come to the conclusion that the most solid chair is the eight to twelve framed chairs from the Renaissance, but the chair must be adapted to the intended use.
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