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Granskning av svensk standard för dimensionering av stålfiberbetongkonstruktioner: Jämförelse av plattor enligt SS 812310 och SS-EN 1992
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
2014 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Examination of Swedish standard design of steel fibre concrete : Comparison of plates according to SS 812310 and SS-EN 1992 (English)
Abstract [sv]

En svensk standard, SS 812310­ – Dimensionering av fiberbetongkonstruktioner, har nyligen tagits fram som skall säkerhetsställa kvalitén och underlätta dimensioneringen av stålfiberbetongkonstruktioner. Tidigare har det inte funnits en dimensioneringsstandard som täcker in området stålfiberbetong. Det har varit upp till enskilda konstruktörer att dimensionera utifrån metoder angivna ur ”Svenska Betongföreningens rapport nr 13”. Materialdata har hämtats från stålfiberleverantörer eller balkprovning. Detta har ibland medfört felaktiga dimensioneringar och en osäkerhet till användandet av stålfiberbetong som material. Förhoppningen med den nyutkomna standarden är att den skall underlätta dimensioneringen av konstruktioner med stålfiberbetong och därigenom att materialet börjar användas i bredare utsträckning.

Syftet med examensarbetet är att granska den nyutkomna standarden genom att applicera dess beräkningsmetoder på en konkret dimensioneringsuppgift.

I examensarbetet har två olika fält av ett bostadsbjälklag, med olika randvillkor, undersökts. Dimensionering med hänsyn till moment- och tvärkraftskapacitet har utförts i brottgränstillstånd, och med hänsyn till sprickbredd och deformationer i bruksgränstillstånd. Dimensioneringen har utförts dels med enbart traditionell armering och dels i en kombination av traditionell armering och stålfibrer.

Resultatet av arbetet visar att användandning av stålfibrer i kombination med armeringsjärn ger en betydande minskning av sprickbredden, deformationerna blir mindre och tvärkraftskapaciteten ökar.

Vi kunde dra slutsatsen att det är bra att en svensk standard för stålfiberbetong har tagits fram så att konstruktionsföretag i Sverige har något att förhålla sig till. Den behöver dock förtydligas i vissa avseenden samt revideras där vi upptäckte några brister.

Abstract [en]

A Swedish standard, SS 812310 – Design of Fibre Concrete Structures, have recently been developed to ensure the quality and facilitate the design of steel fiber concrete. Previously, there was no design standard that covered the material steel fiber concrete. It was up to the individual engineer to design the constructions based methods from the Swedish report “Svenska Betongföreningens rapport nr 13”. Material data was gathered from the steel fibre suppliers or beam test. This sometimes led to incorrect designs and also an uncertainty to the use of steel fiber concrete as a material. The expectation with the newly published standard is to ease the process of designing the constructions of steel fiber concrete and thereby the material will be used in a wider extent.

The purpose of this thesis is to examine the recently published standard by applying its calculation methods on a design task.

In this thesis, two different slab panels of a residential floor, with different boundary conditions, was investigated. Design with respect to moment- and shear force capacity has been carried out in the ultimate limit state, and with respect to crack width and deflections at serviceability limit state. The dimensioning has been performed partly with only traditional reinforcement and partly with traditional reinforcement in combination (Svenska Betongföreningen, 2008) with steel fibers.

The result of this thesis shows that the use of steel fibers combined with reinforcing bar provides a significant reduction in crack width, the deformations become smaller and the shear resistance increases.

We could conclude that it is good that a Swedish standard for steel fiber concrete has been developed so that construction companies in Sweden have something to relate to. However, it needs to be clarified at some aspects and revised because of some deficiencies we discovered.

Place, publisher, year, edition, pages
2014. , 59 p.
Keyword [en]
cracks, reinforcement, steel fibre concrete, SS 812310, Swedish standard
Keyword [sv]
armering, sprickor, SS 812310, stålfiberbetong, svensk standard
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-148665OAI: oai:DiVA.org:kth-148665DiVA: diva2:736944
External cooperation
Byggnadstekniska Byrån AB, BTB
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Supervisors
Examiners
Available from: 2014-08-11 Created: 2014-08-11 Last updated: 2014-08-11Bibliographically approved

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