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Evaluation of a Tramway’s Track Slab in Conventionally Reinforced Concrete or Steel Fibre Concrete
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The dominant reinforcement used widely for concrete structures is conventional steel bars

(rebars). Nevertheless, the perpetual effort toward evolution and development could not exclude

the engineering field, thus new innovative and sophisticated methods are introduced. It is true

that, due to lack of extended regulations and standards, the fibre reinforced concrete (FRC) was

limited to non-structural applications. However, the last years the situation is changing rapidly

and already the applications of FRC include actual structural members.

The subject of the current thesis was a tramway’s track slab from “Sparvag City” project in

Stockholm. The aim was to evaluate the track slab, in terms of alternative reinforcing ways. In

particular three models were examined; model I – conventional reinforcement, model II – steel

fibre reinforced concrete (SFRC) and model III – SFRC with conventional reinforcement. The

assessment was performed from structural, regulations – compliance, economic and ergonomic

perspective. A static linear analysis of the track slab was performed using Abaqus; a finite

element analysis (FEA) software. The track slab was subjected only to mechanical loads (selfweight

and traffic actions) and thus, the design internal forces were extracted. Thereafter,

Eurocode 2 (EN 1992-1-1, 2004) and Swedish standards for FRC structures (SS 812310:2014)

were utilized for the reinforcement design of the models. The design was performed in ultimate

limit state (ULS), for bending moment and shear resistance, and in serviceability limit state

(SLS), for stress limitation and crack control.

Model I and III were successfully designed abiding with the respective regulations and

requirements, while “only fibres” model was considered valid only for bending moment

resistance according to SS 812310:2014. Consequently only models I and III were compared

with each other. From the economic comparison it was obtained that model I was less

expensive than model III, but on the other hand its construction time was larger. Furthermore

model III contained significantly less total rebars’ mass in comparison to model I. This

particularity was crucial for the ergonomic assessment. The human factors, that were relevant

to the ergonomic assessment, improved the quality of the comparison and the extracted

inferences, but also introduced aspects impossible to be put against economic facts as an

equal quantity. Thus, there was not a final proposal as the best solution for the thesis subject.

Abstract [sv]

Armeringen av betongkonstruktioner domineras av konventionell armering (armeringsjärn).

Med den ständiga strävan mot utveckling och förbättring har inom teknikområdet nya

innovativa och avancerade metoder introducerats. Det är på grund av bristen på normer,

standarder som fiberarmerad betong begränsats till icke- bärande ändamål. Däremot har

situationen förändrats under de senaste åren, redan idag kan man se konstruktioner där

fiberarmering används till bärande ändamål.

Amnet for den aktuella masterexamen var betongplatta i projektet ”Sparvag City” i Stockholm.

Syftet var att utvärdera betongplattan, i form av att undersöka alternativa armeringsmöjligheter.

I synnerhet undersöktes tre modeller; modell I- konventionellt armerad platta, modell IIstålfiberarmerad

platta och modell III stålfiberarmerad platta kombinerad med konventionell

armering. Modellernas möjligheter att uppfylla regelverkens krav undersöktes, men de

jämfördes även ur ekonomiskt samt ergonomiskt perspektiv. En statisk linjär analys av

betongplattan genomfördes i ett finit element program, Abaqus. Betongplattan utsattes för

mekanisk belastning (egenvikt samt trafiklast) för vilken dimensionerande krafter extraherats.

Därefter användes Eurocode 2 (EN 1992-1-1, 2004) och den svenska standarden för

fiberarmerade betong konstruktioner (SS 812310:2014) för vidare konstruktionsberäkningar.

Konstruktionsberäkningarna för betongplattan genomfördes i brottgränstillstånd för

böjmoment samt tvärkraft, i brukgränsmotståndet undersöktes betongplattan för

spänningsbegränsningar samt sprickkontroll.

Konstruktionsberäkningarna kunde genomföras för modell I och III med de existerande

föreskrifterna och kraven, men modellen med ”endast fibrer” kunde endast dimensionerna för

böjmoment enligt SS 812310:2014. Därför kunde endast modell I och III fortsättningsvis

jämföras med varandra. Från den ekonomiska jämförelsen erhölls det att modellen I var

billigare än modell III, men att konstruktionstiden var längre. Dessutom var behoven för

konventionell armering (armeringsjärn) betydligt mindre för modell III till skillnad från modell

I. Modellernas innehåll av konventionell armering var avgörande för den ergonomiska

bedömningen. Den mänskliga faktorn, som var relevanta för den ergonomiska bedömningens,

gav jämförelsen av modellerna en annan dimension, där de viktiga mänskliga faktorerna

Place, publisher, year, edition, pages
2015. , 105 p.
Series
TRITA-BKN-Examensarbete, ISSN 1103-4297 ; 453
Series
CONCRETE STRUCTURES, 2015, ISSN 1103-4297
Keyword [en]
Steel fibre reinforced concrete (SFRC), conventional reinforcement, finite element
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-177890ISRN: KTH/BKN/EX –453—SEOAI: oai:DiVA.org:kth-177890DiVA: diva2:874876
Subject / course
Concrete Structures
Educational program
Master of Science in Engineering - Urban Management
Supervisors
Examiners
Available from: 2015-12-02 Created: 2015-11-30 Last updated: 2015-12-02Bibliographically approved

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