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- W41897958 abstract "In concrete structures of complex geometries, the formability of concrete is an asset.However, complex geometries introduce time-demanding form and reinforcement works.By streamlining design and production, utilising the benefits of computational tools as wellas modern production technologies, the buildability of complex concrete structures canbe increased. Combinined with the use of alternative reinforcement methods, the scopeof unique concrete structures could be broadened. Conventionally, steel bars have beenused; however, alternative reinforcement methods have been introduced. First, severalreinforcement methods were studied and the focus for the remainder of the work wereset on the structural behaviour of conventional reinforcement and steel fibre reinforcedconcrete (SFRC).It may not be possible to apply standard idealisations to concrete structures of complexgeometry. Two methods for the design of conventional reinforcement, based on linearfinite element analyses, were investigated and both were found to provide a rationalapproach calculating the amount of reinforcement needed.To investigate the structural behaviour of SFRC, an experimental programme was conducted. Two-way slabs with combinations of conventional reinforcement and SFRCwere tested, investigating the effect from steel fibres on load redistribution. To provokeredistribution after cracking, the conventional reinforcement was arranged asymmetrically,forming a weak and a strong direction. As expected, steel fibres increased the load-carryingcapacity and the number of cracks. Furthermore, the steel fibres increased the portion ofapplied load transferred to the supports in the weak direction and contributed to eveningout the load of the length of the support. Material characterisation of the SFRC wasperformed through both uni-axial and three-point bending tests. A numerical approachwas successfully utilised to relate the two test methods to each other.Analytical and numerical analyses of both beams and slabs were conducted, and the resultswere compared with experiments. In these cases, the additional capacity provided by thesteel fibres was observed both experimentally and in numerical analysis. Depending onthe interpretation of analytical proposal in Model Code 2010, the load-carrying capacitywas either underestimated or rather accurately estimated.Through a combination of experimental, numerical and analytical work on both structuraland material levels, this thesis contributes to an improved understanding for the structuraluse of SFRC, especially in structures of complex geometry.Keywords: Concrete structres, Geometrically complex structures, Reinforcement alternatives,Steel fibre reinforcement, Rational design" @default.
- W41897958 created "2016-06-24" @default.
- W41897958 creator A5031693094 @default.
- W41897958 date "2014-01-01" @default.
- W41897958 modified "2023-09-27" @default.
- W41897958 title "Steel Fibres in Reinforced Concrete Structures of Complex Shapes: Structural Behaviour and Design Perspectives" @default.
- W41897958 hasPublicationYear "2014" @default.
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