Publicações

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

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.…

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

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,…

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

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…

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

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…

A new strengthening technique for increasing the load carrying capacity of rectangular reinforced concrete columns subjected to axial compressive loading

In this work, a new technique for the efficient confinement of reinforced concrete (RC) columns of rectangular crosssection is described and its effectiveness is assessed experimentally. This technique is based on the concept of applying strips of carbon fiber reinforced polymer (CFRP) wet layup sheets with a certain prestress level using a mechanical device. The influence of the cross-section aspect…

Performance Assessment of a Semi-Circular Breakwater through CFD Modelling

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…

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

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…

Urban furniture in fiber reinforcemenet concrete with high durability

Within the scope of the “NG_TPfib” R&D project, Exporplás and CiviTest have, in the recent past, developed a new typology of polypropylene fibers for the production of urban furniture of high durability by eliminating conventional steel reinforcements susceptive to corrosion. This reinforcement replacement strategy also allows the development of lighter and more elegant urban furniture with complex geometries at competitive…

Appraisal of MC2010 shear resistance approaches coupled with a residual flexural strength prediction model

In the present work the predictive performance of the two approaches proposed by Model Code 2010 for the evaluation of the shear capacity of fiber reinforced concrete (FRC) elements flexurally reinforced with conventional steel bars is assessed considering a database (DBs) constituted by 80 FRC beams do not including conventional transverse reinforcements. The accuracy of these shear models is evaluated…

Shear strengthening of RC beams with thin panels of mortar reinforced with recycled steel fibres

The use of thin cement based panels reinforced with relatively high content of Recycled Steel Fibres (RSF) for the shear strengthening of Reinforced Concrete (RC) beams is investigated in the present work. The mechanical properties of this Recycled Steel Fibre Reinforced Mortar (RSFRM) are characterised. The panels are produced by using a mixing technique similar to the one used in…

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