Sustainability is still an evolving concept, even if its main trends correlated to civil engineer... more Sustainability is still an evolving concept, even if its main trends correlated to civil engineering have been significantly debated in the last twenty years. Model Code 2020 technical committees, still in progress, are clearly highlighting that sustainable evolution has to combine social aspects, environmental aspects and economic aspects: the rational development of advanced societies has to guarantee human resources to future human generations. According to this principle, the paper would like to show how the use of fibre reinforced concrete can respect this complex balance, improving the performance of common reinforced concrete and showing how cementitious construction materials could represent, even nowadays in many cases, the best solution of industrialized and rapidly evolving societies to their need to have efficient and updated structures and infrastructures
In the design of civil structures, the reduction of floor masses represents one of the most found... more In the design of civil structures, the reduction of floor masses represents one of the most foundamental optimization strategies. In the last years, thanks to the spreading of new building materials characterized by remarkable mechanical performance, new innovative solutions were developed, in particular with reference to precast structures. In this paper, a proposal for a semi- precast lightweight slab system is presented, with reference to a research project held at Politecnico di Milano with the financial support of Mangiavacchi Pedercini Spa. This technological solution is composed of high-performance fiber-reinforced concrete beams (HPFRCC) combined with textile reinforced concrete (TRC) disposable formworks and a cast-in-place steel fiber-reinforced concrete (SFRC) finishing layer. The advantages of such technology are proved by the experimental and numerical results present- ed in the following
The paper presents a synthesis of an extensive experimental campaign on linear and two‐dimensiona... more The paper presents a synthesis of an extensive experimental campaign on linear and two‐dimensional steel fiber reinforced concrete (SFRC) structural elements carried out to check the ductility requirements aimed at guaranteeing limit analysis approaches for the computation of ultimate load‐bearing capacity of SFRC structures; special attention is devoted to the role of the degree of redundancy of the structure. In particular, full‐scale shallow beams and slabs reinforced with steel fibers (with or without conventional longitudinal reinforcement) were tested in two different laboratories: the Politecnico di Milano (PoliMI) and the University of Brescia (UniBS). In this experimental campaign, two different fiber contents and fiber types were considered. The experimental investigation, carried out within the activities to support Annex L of Eurocode 2, was fundamental also for developing the design rules included in the fib Model Code 2020 and allowed to formulate conclusions regarding...
fib Bulletin 79. Fibre-reinforced concrete: From design to structural applications, 2017
In the fib Model Code 2010, fibre-reinforced concrete (FRC) is finally recognized as a cement com... more In the fib Model Code 2010, fibre-reinforced concrete (FRC) is finally recognized as a cement composite material for construction: this step favours significant structural applications based on new concept requirements. In the Model Code, a strong effort has been devoted to introducing a material classification in order to standardize a performance-based production and stimulate an open market for every kind of fibre, favouring the rising of a new technological actor: the composite producer. From standard classification, the simple constitutive models introduced allow designers to identify effective design constitutive laws, trying to take into account the fibres contribution in term of performance and suitably orienting its structural use. An FRC application concerning tunnelling is discussed here, focusing on the design requirements and structural advantages offered by fibres addition and on further research needs. In this application a useful combination of strain softening and strain hardening materials allowed by the unified Model Code approach can offer designers interesting opportunities and new structural challenges
Sustainability is still an evolving concept, even if its main trends correlated to civil engineer... more Sustainability is still an evolving concept, even if its main trends correlated to civil engineering have been significantly debated in the last twenty years. Model Code 2020 technical committees, still in progress, are clearly highlighting that sustainable evolution has to combine social aspects, environmental aspects and economic aspects: the rational development of advanced societies has to guarantee human resources to future human generations. According to this principle, the paper would like to show how the use of fibre reinforced concrete can respect this complex balance, improving the performance of common reinforced concrete and showing how cementitious construction materials could represent, even nowadays in many cases, the best solution of industrialized and rapidly evolving societies to their need to have efficient and updated structures and infrastructures
In the design of civil structures, the reduction of floor masses represents one of the most found... more In the design of civil structures, the reduction of floor masses represents one of the most foundamental optimization strategies. In the last years, thanks to the spreading of new building materials characterized by remarkable mechanical performance, new innovative solutions were developed, in particular with reference to precast structures. In this paper, a proposal for a semi- precast lightweight slab system is presented, with reference to a research project held at Politecnico di Milano with the financial support of Mangiavacchi Pedercini Spa. This technological solution is composed of high-performance fiber-reinforced concrete beams (HPFRCC) combined with textile reinforced concrete (TRC) disposable formworks and a cast-in-place steel fiber-reinforced concrete (SFRC) finishing layer. The advantages of such technology are proved by the experimental and numerical results present- ed in the following
The paper presents a synthesis of an extensive experimental campaign on linear and two‐dimensiona... more The paper presents a synthesis of an extensive experimental campaign on linear and two‐dimensional steel fiber reinforced concrete (SFRC) structural elements carried out to check the ductility requirements aimed at guaranteeing limit analysis approaches for the computation of ultimate load‐bearing capacity of SFRC structures; special attention is devoted to the role of the degree of redundancy of the structure. In particular, full‐scale shallow beams and slabs reinforced with steel fibers (with or without conventional longitudinal reinforcement) were tested in two different laboratories: the Politecnico di Milano (PoliMI) and the University of Brescia (UniBS). In this experimental campaign, two different fiber contents and fiber types were considered. The experimental investigation, carried out within the activities to support Annex L of Eurocode 2, was fundamental also for developing the design rules included in the fib Model Code 2020 and allowed to formulate conclusions regarding...
fib Bulletin 79. Fibre-reinforced concrete: From design to structural applications, 2017
In the fib Model Code 2010, fibre-reinforced concrete (FRC) is finally recognized as a cement com... more In the fib Model Code 2010, fibre-reinforced concrete (FRC) is finally recognized as a cement composite material for construction: this step favours significant structural applications based on new concept requirements. In the Model Code, a strong effort has been devoted to introducing a material classification in order to standardize a performance-based production and stimulate an open market for every kind of fibre, favouring the rising of a new technological actor: the composite producer. From standard classification, the simple constitutive models introduced allow designers to identify effective design constitutive laws, trying to take into account the fibres contribution in term of performance and suitably orienting its structural use. An FRC application concerning tunnelling is discussed here, focusing on the design requirements and structural advantages offered by fibres addition and on further research needs. In this application a useful combination of strain softening and strain hardening materials allowed by the unified Model Code approach can offer designers interesting opportunities and new structural challenges
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