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Böjprovning av stålförstärkta limträbalkar
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
2017 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

I detta examensarbete undersöks limträbalkars styrka och styvhet och hur dessa parametrar ändrar sig när balkarna förstärks med plåt. En litteraturstudie har genomförts för att ta reda på vad som gjorts tidigare vid diverse förstärkningsförsök av limträbalkar.

Limträbalkar har högre hållfasthet än vanligt konstruktionsvirke. Vid dimensionering i bruksgränstillståndet gäller en viss maximal nedböjning som beror av balkens spännvidd. En förstärkning med stål, som har högre hållfasthetsegenskaper, kan innebära att man kan klara av kraven med ett mindre tvärsnitt. Även balkens styvhet skulle kunna höjas, vilket i så fall leder till att balkens egenfrekvens höjs.

I denna studie undersöks tre olika stålförstärkningar av limträbalkar. Plåtarna limmas fast på balkarna med hjälp av konstruktionslim. Dessa läggs sen på två upplag där en punktlast belastar mitt på balken och trycker tills brott uppstår.

De olika förstärkningarna visar på en kraftökning mellan 23,9-30,7 % och en styvhetsökning mellan 13,2-37,6 %. Med en annan typ av stål, med högre hållfasthet, hade ökningarna antagligen kunnat vara ännu större.

Abstract [en]

In this master thesis the strength and stiffness of glulam beams is being investigated and how these parameters change when you reinforce the beams with steel. A literature review has been conducted to establish what’s been done in this area previously, regarding reinforcements of glulam beams.

Glulam beams got a greater solidity compared to regular construction timber. When dimensioning beams, a certain maximum deflection is allowed, that depends on the beam's span. A reinforcement with steel, that has higher strength properties, can mean that you can handle the requirements with a smaller cross section. Even the stiffness of the beam could be raised, which in turn causes the beam's frequency to be raised.

In this particular study three different types of steel reinforcement has been investigated. The steel plates were glued together with the glulam beams. The beams were placed upon heaps and a point load stressed the beam at the center until the beam fractured.

The reinforced beam showed an increase in strength between 23,9-30,7 % and an increase in stiffness between 13,2-37,6 %. With a different type of steel, with higher solidity, the increases would probably been greater.

Place, publisher, year, edition, pages
2017. , p. 34
Keywords [en]
Glulam, steel, cross section, strength, stiffness
Keywords [sv]
Limträ, plåt, tvärsnitt, styrka, styvhet
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:hig:diva-24065OAI: oai:DiVA.org:hig-24065DiVA, id: diva2:1106496
Subject / course
Building engineering
Educational program
Högskoleingenjör
Supervisors
Examiners
Available from: 2019-01-24 Created: 2017-06-07 Last updated: 2019-01-24Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard-cite-them-right
  • ieee
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Output format
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