Browsing by author "Dias-da-Costa, D."
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ASSESSING STEEL STRAINS ON REINFORCED CONCRETE MEMBERS FROM SURFACE CRACKING PATTERNS
Carmo, R.N.F.; Valença, J.; Silva, D.; Dias-da-Costa, D.Published 2015-01-01The measurement of steel strains in reinforced concrete structures is often critical to characterise stresses and forces along the member. In this scope, this manuscript describes the development of a method to assess steel ...Open AccessArticle -
Assessment of the Behavior of FRP-Strengthened RC Slabs Using a Discrete Crack Model
Dias-da-Costa, D.; Graça-e-Costa, Rui; Ranzi, Gianluca; Smith, Scott T.Published 2018-01-01Open AccessArticle -
Chattering-free sliding mode control with a fuzzy model for structural applications
Baghaei, K.; Ghaffarzadeh, H.; Hadigheh, A.; Dias-da-Costa, D.Published 2019-01-01This paper proposes a chattering-free sliding mode control (CFSMC) method for seismically excited structures. The method is based on a fuzzy logic (FL) model applied to smooth the control force and eliminate chattering, ...Open AccessArticle -
Comparison of Reynolds averaging Navier-Stokes (RANS) turbulent models in predicting wind pressure on tall buildings
Mohotti, D.; Wijesooriya, K.; Dias-da-Costa, D.Published 2019-01-01This paper presents a detailed comparison of using Reynolds Averaging Navier-Stokes (RANS) approach in predicting wind pressure on a super-tall 406 m slender tower with circular cross-section. The results obtained from ...Open AccessArticle -
Coupling finite elements for modelling fluid flow in fractured porous media
Vafajou, B.; Dias-da-Costa, D.; Bitencourt, L.A.G.; Manzoli, O.L.Published 2018-01-01The presence of discontinuities such as cracks and faults in porous media can remarkably affect the fluid pressure distribution. This is due to considerable contrast between hydraulic properties of porous matrix and ...Open AccessConference paper -
Crack growth modelling: enriched continuum vs. discrete models
Nguyen, V.P.; Nguyen, G.D.; Dias-da-Costa, D.; Shen, L.; Nguyen, C.T.Published 2015-01-01Failure in quasi-brittle materials usually appears in the form of narrow bands called fracture process zones, where all inelastic deformation takes place, while the surrounding bulk material outside those areas typically ...Conference paper -
Crack propagation monitoring using an image deformation approach
Dias-da-Costa, D.; Valença, J.; Julio, E.; Araujo, H.Published 2017-01-01An image deformation method is herein proposed to monitor the crack propagation in structures. The proposed approach is based on a computational algorithm that uses displacements measured by photogrammetry or image correlation ...Open AccessArticle -
A discrete framework for fracture simulation based on the embedment of strong discontinuities with minimum degrees of freedom
Dias-da-Costa, D.; Ranzi, G.Published 2017-01-01There are many situations where the ability to predict the premature failure of structures requires fracture models with high level of detail. For example, this is the case of concrete structures strengthened with CFRP ...Conference paper -
An embedded strong discontinuity approach based on local degrees of freedom for modelling fracture in concrete structures
Carvalho, M.; Dias-da-Costa, D.Published 2018-01-01In this paper, a new purely local embedded formulation is proposed for the simulation of crack propagation in concrete structures. The degrees of freedom related with the opening of the discontinuities are condensed when ...Conference paper -
An FDM study of particle breakage under rotational point loading
Wei, D.; Zhao, B.; Dias-da-Costa, D.; Gan, Y.Published 2019-01-01The most commonly adopted method to test the strength of single sand particles is based on platen experiments. This setup tends to align the loading direction towards the particle minimum axis and provide an upper limit ...Open AccessArticle -
Fracture toughness testing using photogrammetry and digital image correlation
Kan, W. H.; Albino, C.; Dias-da-Costa, D.; Dolman, K.; Lucey, T.; Tang, X.; Cairney, J.; Proust, G.Published 2018-01-01Digital image correlation (DIC) is an optical technique commonly used for measuring displacement fields by tracking artificially applied random speckle patterns, which can sometimes be a problem for tracking small-scale ...Open AccessArticle -
Influence of concrete strength and steel fibre geometry on the fibre/matrix interface
Simões, T.; Octávio, C.; Valença, J.; Costa, H.; Dias-da-Costa, D.; Júlio, E.Published 2017-01-01The main objective of the research described in this paper was to evaluate how the concrete compressive strength and the geometry of the steel fibres influence the behaviour of the fibre/matrix interface. With this aim, ...Open AccessArticle -
Influence of fibres on the mechanical behaviour of fibre reinforced concrete matrixes
Simões, T.; Costa, H.; Dias-da-Costa, D.; Júlio, E.Published 2017-01-01An experimental analysis focused on the mechanical behaviour of fibre reinforced concrete matrixes (FRCM) is presented using a total of three hundred and twelve specimens. A reference plain mixture was first defined and ...Open AccessArticle -
Influence of rebar diameter in concrete cracking studied using a discrete crack approach
Dias-da-Costa, D.; Graça-e-Costa, R.Published 2017-01-01The ability to model fracture propagation is critical to predict the structural response of a concrete member and possible failure mechanisms. Even for structures under normal service loads, good estimations on the overall ...Open AccessConference paper -
Influence of type and dosage of micro-fibres on the physical properties of fibre reinforced mortar matrixes
Simões, T.; Costa, H.; Dias-da-Costa, D.; Júlio, E.Published 2018-01-01An experimental study is herein presented focusing the physical properties of fibre-reinforced mortar. A reference mortar mixture was adopted and three different types of reinforcement with micro fibres (steel, polypropylene ...Open AccessArticle -
Microstructure characterisation and mechanical properties of a functionally-graded NbC/high chromium white cast iron composite
Kan, W. H.; Albino, C.; Dias-da-Costa, D.; et al.Published 2018-01-01A functionally graded NbC – high chromium white cast iron composite was successfully fabricated by centrifugal casting for high wear applications. The migration of primary NbC particles to the outer periphery, as predicted ...Open AccessArticle -
Mixed-mode fracture and load misalignment on the assessment of FRP-concrete bond connections
Neto, P.; Alfaiate, J.; Dias-da-Costa, D.; Vinagre, J.Published 2016-01-01Considerable dispersion is usually found in experimental data concerning the material properties of FRP-concrete bond connections. In pure shear models, the direction of FRP loading is assumed to be parallel to the axis ...Open AccessArticle -
Model uncertainty in discrete and smeared crack prediction in RC beams under flexural loads
Dias-da-Costa, D.; Cervenka, V.; Graça-e-Costa, R.Published 2018-01-01Advanced non-linear finite element models are currently available to perform the design of concrete structures. The development and calibration of the safety factors for the next generation of design guidelines will require ...Open AccessArticle -
Modeling reinforced concrete structures using coupling finite elements for discrete representation of reinforcements
Bitencourt Jr, L.G.A.; Manzoli, O.; Trindade, Y.; Rodrigues, E. A.; Dias-da-Costa, D.Published 2018-01-01This paper presents a new and general methodology to represent rebars and their bond-slip behavior against concrete based on coupling nite elements. Among the main features and advantages of the proposed technique are: ...Open AccessArticle -
Modelling complex cracks with finite elements: a kinematically enriched constitutive model
Nguyen, V.; Nguyen, G.; Nguyen, C.; Shen, L.; Dias-da-Costa, D.; El Zein, A.; Maggi, F.Published 2017-01-01A continuum constitutive framework with embedded cohesive interface model is presented to describe the failure of quasi-brittle materials. Both cohesive behaviour for cracking inside the fracture process zone and elastic ...Open AccessArticle
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