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Svikt i bjälklag
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2012 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Deflection in joists (English)
Abstract [sv]

För att träbjälklag med långa spännvidder ska klara av kraven för svikt krävs det att man utnyttjar samverkan, lastfördelning och om möjligt ramverkan. Lättelement AB använder dessa utformningar av elementen som de själva utvecklar och producerar.

I det här examensarbetet beräknas svikten för Lättelement ABs element. Dessa kontrolleras sedan mot de krav som ställs på svikt i Sverige för att se om elementen är tillräckligt bra. För att Lättelement AB enkelt ska kunna utföra dessa beräkningar på element med andra spännvidder, material och geometrier har har jag gjort ett flexibelt program där användaren själv kan välja egna förutsättningar. Även en parameterstudie har gjorts där elementens kompontenter testats i olika riktningar samt hur stor skillnad svikten blir utan ramverkan.

De flesta elementen klarade kraven för svikt eftersom man utnyttjar samverkan, lastfördelning och ramverkan i dessa.

Abstract [en]

For wooden joists with long spans to meet the requirements with respect to springiness or deflection caused by a static midpoint load, composite action, load sharing and possibly frame action need to be used. The elements developed and produced by Lättelement AB are designed to include these type of actions.

In this thesis work, the vertical deflection of Lättelement AB’s floor elements of different designs, are evaluated. The deflection criteria according to Eurocode 5 and the Swedish standards is then used to determine the acceptability of the different floor designs. A generalized program has been developed to calculate the deflection, where different parameters such as material quality, geometrical dimensions, cross-section properties and span lengths easily can be varied. Using this program, the behavior and and design of the floor elements can more easily be improved.

A parameter study has been conducted to evaluate the influence of varying the directions of the components and the effect of the frame action.

Most of Lättelement AB’s floor designs pass the criterion for springiness due to the fact that composite action, load sharing and frame action can be utilized.

Place, publisher, year, edition, pages
2012. , 43 p.
Series
BY, 1220
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:umu:diva-58226OAI: oai:DiVA.org:umu-58226DiVA: diva2:547419
External cooperation
Lättelement AB
Educational program
Bachelor of Science Programme in Civil Engineering
Presentation
2012-06-04, 14:30 (Swedish)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-29 Created: 2012-08-28 Last updated: 2012-08-29Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf