Publicações

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…

Desenvolvimento de painel sanduíche multifuncional para a reabilitação sustentável de edifícios porticados de betão armado: caracterização de componentes

Esta comunicação apresenta um trabalho de investigação dedicado ao desenvolvimento de um painel sanduíche compósito multifuncional concebido para a reabilitação estrutural e térmica de edifícios porticados de betão armado construídos em Portugal a partir da década de 1960 e até meados da década de 1980. Este painel é composto essencialmente por três componentes que visam assegurar a multifuncionalidade pretendida, nomeadamente:…

Influência da corrosão no comportamento pós-fendilhação do betão reforçado com fibras de aço recicladas

O betão reforçado com fibras de aço recicladas (BRFAR) possui elevadas potencialidades técnicas, ambientais e económicas para ser utilizado em aplicações estruturais, constituindo uma solução sustentável que promove a eficiência e durabilidade das estruturas e a sustentabilidade ambiental. A investigação da durabilidade do BRFAR é ainda escassa, nomeadamente, sobre os efeitos da corrosão das fibras no comportamento pré- e pós-fendilhação…

FRCcalc – Software for design of fiber reinforced concrete elements according to MC2010 recommendations

A new software, denominated FRCcalc, was developed for the analysis and design of fiber reinforced concrete (FRC) members based on the recommendations and design guidelines of MC2010. The software is guided for the analysis of FRC cross-sections with and without conventional steel reinforcements, submitted to bending and shear, in order to assess the ultimate and serviceability limit state safety verifications…

Reforço ao corte de vigas em betão armado recorrendo a painéis em micro betão auto compactável reforçado com fibras metálicas de pneus reciclados

No passado recente, o grupo de investigação “Structural Composites” da Universidade do Minho e a empresa CiviTest – Pesquisa de Novos Materiais para a Engenharia Civil, Lda. têm realizado vários estudos experimentais e numéricos avançados, em parceria, que permitiram a aquisição de conhecimento e o desenvolvimento de materiais de matriz cimentícia reforçados com fibras recicladas (BRFR), nomeadamente as provenientes da…

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