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KL-trä enligt balkteori: En undersökning av beräkningsmetoden från ”KL-trähandbok” utgiven av Svenskt trä (2017)
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2018 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
CLT by beam theory : A study of the calculation procedure from the book ”KL-trähandbok” published by Svenskt trä (2017) (English)
Abstract [sv]

Martinsons utför idag beräkningar på KL-träskivor med FEM-beräkningar. För enklare lastfall skulle det vara tidsbesparande att genomföra beräkningar enligt klassisk balkteori. I samband med att det har tillkommit relativt ny teori om beräkning av KL-trä enligt balkteori från boken ”KL-trähandbok” utgiven av Svenskt trä, önskar Martinson tillägna sig denna kunskap. Målet med rapporten är att skapa en bättre förståelse för teorin dels genom att analysera beräkningsmetoden numerisk vid hjälp av ett Excelverktyg som har utvecklats och dels genom att granska, tillföra och diskutera teorin.

 

Konkreta beräkningsexempel togs fram och data matades in beräkningsmallen i Excel. Resultatet redovisas i tabeller tagit från Excel och verifierar det som beskrivs i teorin. Vissa formler tagen från teorin i KL-trähandboken är begränsad i form av att de gäller under vissa omständigheter som exempelvis skiktskjuvning som bara gäller för en skiva bestående av tre skikt.

 

Delar av teorin som KL-trähandboken redovisar saknar utförliga förklaringar. Under diskussionen har studentens tolkning av teorin presenterats med bakgrund av den teori som finns i rapporten.

 

Examensarbetet exemplifierar beräkningsmetoden från KL-trähandboken och belyser vilka delar av teorin behöver utforskas närmare.

Abstract [en]

Martinsons calculates stresses in CLT by using Finite Element Analysis. This tool can solve complex problems but it is time-consuming to verify results and to build the model, therefore less complex problems concerning verification of CLT with beam theory could prove to be more efficient. A book named “KL-trähandbok” published by “Svenskt trä” presents a chapter on verification of CLT with beam theory. Martinsons aims to learn more about this theory. By using an Excel-tool created by the student based on the equations from this theory numerical results can be analysed. At the same time further research was performed with the aim to get a better understanding of the theory.

 

To get an understanding of how the different variables affects an CLT element, some more specific examples were implemented in the excel-tool. The results from Excel can be used to verify parts of the theory. Some equations were difficult to implement in a practical example and was e.g. restricted to describe only a three-layer board.

 

Some parts of the theory are lacking detailed explanations which gave room for discussion, however further research is needed to get a better understanding.

 

In conclusion it can be said that the work done in this bachelor’s degree of structural engineering resulted in an Excel-tool that can verify and show how different variables changes the characteristics fore CLT elements according to beam theory, but with limitations. Further conclusion is that some of the additional theory and discussion of the theory from “KL-trähandbok” may contribute to a better understanding of the theory.

Place, publisher, year, edition, pages
2018. , p. 42
Keywords [sv]
KL-trä, balkteori
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:umu:diva-149462OAI: oai:DiVA.org:umu-149462DiVA, id: diva2:1222006
External cooperation
Martinsons
Subject / course
Byggteknik
Educational program
Bachelor of Science Programme in Civil Engineering
Supervisors
Examiners
Available from: 2018-06-21 Created: 2018-06-20 Last updated: 2018-06-21Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • nn-NB
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Output format
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  • text
  • asciidoc
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