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Detaljstudie av tryckbrott i betongsliprar: Samband mellan tryckprovsresultat och val av dimensioneringsmetod
Linnaeus University, Faculty of Technology, Department of Building Technology.
Linnaeus University, Faculty of Technology, Department of Building Technology.
2016 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Detail study of compression failure in concrete sleepers : Correlation between pressure test results and choice of design method (English)
Abstract [sv]

En jämförelse av Abetongs beräkningsunderlag och statistik från tryckprov visar att sliprarna klarar mycket mer belastning än vad beräkningarna visar. I den här studien har en utvärdering av använda beräkningsmetoder gjorts, samt en jämförelse mellan olika dimensioneringsprinciper för att komma så nära resultaten vid tryckprov som möjligt.

Beräkningar med förenklat tryckblock och idealiserad-rektangulär parabolisk arbetskurva visade att det senare alternativet gav ett något högre värde på sliprarnas momentkapacitet, men förändringen förklarade inte varför den verkliga momentkapaciteten är så mycket högre än den framräknade.

Den faktor som enligt den här undersökningen påverkar betongens tryckhållfasthet och i sin tur ger en större momentkapacitet än vad tidigare beräkningar visar är förhindrad tvärutvidgning. Studien visar att hänsyn till förhindrad tvärutvidgning bör tas med i beräkningar på betongsliprars hållfasthet. Detta medför att det finns utrymme att minska betongklass på Abetongs slipermodell A26 från C58/70 till C50/60.

Abstract [en]

A comparison of the calculation data from Abetong and statistics from pressure tests shows that the sleepers can handle more load than the calculations show. In this study, an evaluation of used calculation methods has been made and a comparison between different principles of dimensioning to get as close to the result from the pressure tests as possible.

Calculations with rectangular stress distribution and idealized parabola-rectangle diagram showed that the second alternative gave a bit higher value on the sleeper bending moment capacity, but the difference did not explain why the real bending moment capacity is so much higher than the calculated one.

According to this study confined concrete gave a larger capacity than the previous calculations. With regards to that effect the compressive strength of the concrete almost doubled, which together with an increased critical strain gave a bending moment capacity very close the one obtained from the pressure tests. This study concludes that the confined concrete effect should be considered when calculating the concrete strength. This also means that there is a possibility to reduce the concrete strength of Abetong’s sleeper model A26 from C58/70 to C50/60. 

Place, publisher, year, edition, pages
2016. , 73 p.
Keyword [en]
Concrete sleeper, compression failure, design method, testing, cross section dimension, rectangular stress distribution, idealized parabola-rectangle diagram, confined concrete, concrete strength, pressure strength
Keyword [sv]
Betongsliper, tryckbrott, dimensionering, provning, tvärsnittsdimensionering, förenklat tryckblock, parabolisk-rektangulär, arbetskurva, tvärutvidgning, betongklass, tryckhållfasthet
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:lnu:diva-53371OAI: oai:DiVA.org:lnu-53371DiVA: diva2:935647
External cooperation
Abetong AB, Växjö
Subject / course
Byggteknik
Educational program
Civil Engineering Programme, Building and Construction, 180 credits
Presentation
2016-05-31, M1088, Universitetsplatsen 1, Växjö, 08:30 (Swedish)
Supervisors
Examiners
Available from: 2016-06-14 Created: 2016-06-11 Last updated: 2016-06-14Bibliographically approved

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Detaljstudie Tryckbrott(7702 kB)90 downloads
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