Publications
Posted in National Journals

Avaliação das potencialidades técnicas e ambientais do betão reforçado com fibras de aço recicladas para aplicações estruturais

by CiviTestPosted on

No presente trabalho pretendeu-se avaliar os benefícios técnicos e ambientais, ao nível do material, da utilização das FAR no reforço do betão, em alternativa às FAI. Para tal, foi realizado um programa experimental de caraterização do comportamento pósfendilhação do BRFAR e do betão reforçado com fibras de aço industriais (BRFAI) constituído por ensaios de flexão em vigas e placas circulares.…
Posted in National ConferencesProject NG_TPfib

Comportamento pós-fendilhação de betão reforçado com fibras exposto a temperaturas elevadas

by CiviTestPosted on

A exposição de estruturas de betão a temperaturas elevadas, como no caso de incêndio, conduz, entre outros, a uma degradação das propriedades mecânicas do material. Dependendo da temperatura e do tempo de exposição, esta ocorrência acidental potencia a ocorrência de fissuração e destacamento do betão – spalling (por vezes de forma explosiva), podendo comprometer irremediavelmente a funcionalidade dos elementos estruturais,…
Posted in National JournalsProject PreSlabTec

PreSlabTec – Novo sistema de laje préfabricada ultraleve e de elevado desempenho estrutural

by CiviTestPosted on

Com o objetivo de explorar o potencial da utilização criteriosa de betão reforçado com fibras (BRF) e perfis de chapa aço enformados a frio para produzir um sistema construtivo inovador de laje aligeirada integralmente pré-fabricada e de elevado desempenho comportamental para edifícios de habitação e comércio, a CiviTest realizou ensaios experimentais preliminares com protótipos de escala reduzida e efetuou modelações…
Posted in International Journals (ISI)Publications

Development of sandwich panels for multi-functional strengthening of RC buildings

by CiviTestPosted on

This paper presents an experimental and numerical study aiming at the development of a sustainable and multifunctional composite sandwich panel for the rehabilitation of reinforced concrete (RC) buildings from the 1960s to the mid-1980s. The sandwich panel, which was designed for the structural, thermal and acoustic refurbishment of building facades, comprises three main components: (i) thin outer layers of Recycled…
Posted in International Journals (ISI)Publications

Blind competition on the numerical simulation of steel-fiber-reinforced concrete beams failing in shear

by CiviTestPosted on

Experimental research has shown the extraordinary potential of the addition of short fibers to cement-based materials by improving significantly the behavior of concrete structures for serviceability and ultimate limit states. Software based on the finite element method has been used for the simulation of the material nonlinear behavior of fiber-reinforced concrete (FRC) structures. The applicability of the existing approaches has…
Posted in International Journals (ISI)Project NG_TPfibPublications

A multiscale model for optimizing the flexural capacity of FRC structural elements

by CiviTestPosted on

In the present work, a multiscale model for fibre reinforced concrete (FRC) beams failing in bending is presented. At the microstructural level, the fibre is modelled as a one-dimensional continuum with axial, shear and bending deformability, with cohesive-like interfaces to simulate the interaction with the surrounding concrete. At the macroscopic level, the response of the beam is simulated by discretising…
Posted in International ConferencesProject NG_TPfibPublicationsSem categoria

A model for optimizing hooked end steel fibre reinforcements in cracked cement composites

by CiviTestPosted on

The addition of metallic fibres in concrete is a widely used technique to increase its resistance to crack opening, energy absorption capacity, and durability. The properties of the resulting composite strongly depend on the geometry of the fibres, which usually dispose of an hooked end, as well as on the mechanical properties of both the fibre and the concrete. The…
Posted in National JournalsProject NG_TPfib

Projeto e monitorização de fundação especial em betão reforçado com sistema híbrido

by CiviTestPosted on

No âmbito do dimensionamento da fundação de uma estrutura com grande desenvolvimento, foi prevista a construção de um elemento com secção transversal tubular de parede delgada em betão com um sistema combinando armaduras convencionais de aço e fibras de polipropileno (PP). A fundação possui umasecção transversal com 1.20×1.20m2 e um desenvolvimento de 22.4m. Nas extremidades e a cerca de ¼…
Posted in International Journals (Non - ISI)Project EcOffShorBEPublications

Performance Assessment of a Semi-Circular Breakwater through CFD Modelling

by CiviTestPosted on

Coastal defence works, such as breakwaters, are structures that aim to support the action of waves and dissipate their energy. Therefore, they provide conditions for stabilizing the coast, protecting ports, beaches and other coastal infrastructures and ecosystems. Semicircular breakwaters have been applied in different locations around the world due to their aesthetic advantages and high structural performance. Marine structures are…
Posted in International ConferencesProject NG_TPfibPublications

Integrated model for predicting the flexural capacity of concrete elements reinforced with non-corrodible discrete reinforcements

by CiviTestPosted on

Polypropylene fibres (PP) have been used mainly in non-structural applications for limiting crack width due to shrinkage effects of cement-based materials. Being insusceptible to corrosion, PP fibres can also be regarded as viable discrete reinforcement elements for the production of thin concrete elements. The relatively low elasticity modulus, tensile strength and almost frictional-based reinforcing nature of PP fibres have been…

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