Paulo J. S. Cruz

University of Minho

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Fernão D. Magalhães

Universidade do Porto

Isabel Valente

University of Minho

Adélio Mendes

Universidade do Porto

Luísa Carvalho

Universidade do Porto

Bruno Figueiredo

University of Minho

Jorge Martins

Polytechnic Institute of Viseu

João Ferra

Sonae (Portugal)

Jorge M. Branco

University of Minho

João Pereira

Universidade Federal do Rio Grande do Norte

José C. Matos

University of Minho

Cooperative Institutions

University of Minho

Universidade do Porto

University of Coimbra

University of Aveiro

University of Lisbon

École Polytechnique Fédérale de Lausanne

Universitat Politècnica de Catalunya

University of Beira Interior

Institute for Sustainability

University of Trás-os-Montes and Alto Douro

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Lifetime analysis of infrastructures

CRC Press eBooks (2014)

Paulo J. S. Cruz Helena Gervásio L da Silva

10.1201/b17063-158

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Citations (1)

Estructuras de hielo reforzado

Paulo J. S. Cruz J. Belis

Es bien sabido que la exposicion del hormigon a varios ciclos de hielodeshielo disminuye su resistencia. Por esa razon hay una gran demanda de materiales de construccion adecuados a los ambientes criogenicos. Varios aditivos se han utilizado y estudiado para hacer el hielo mas fuerte y mas duro. Aparas de madera, arena, fibra de vidrio, telas y otros materiales geotecnicos, entre otros materiales, se han utilizado como soluciones de refuerzo de hielo. Las mezclas que pueden ser moldeadas en cualquier forma y congeladas, suelen ser extremadamente resistente y duraderas, siempre y cuando se mantengan por debajo de una temperatura de congelacion. Por otro lado, la mayoria de los tipos de materiales compuestos de hielo tienen un comportamiento mas ductil si se compara con hielo normal. La conductividad de materiales compuestos de hielo es mas baja que la del el hielo tradicional, resultando en una tasa de fusion mas baja. Las estructuras construidas con estos materiales compuestos de hielo son mas fuertes y capaces de soportar cargas mas elevadas, por lo que sera posible la construccion de estructuras mas ligeras. Esto se traduce en un menor consumo y manejo de materiales, lo que implica que el tiempo de fabricacion de una estructura se reduzca. En 2016 un consorcio de profesores y estudiantes de varias universidades europeas, en estrecha cooperacion con la comunidad local de Juuka (Finlandia), utilizo un material compuesto de celulosa con hielo para construir modelos de gran escala de dos estructuras impresionantes: un puente de arco inspirado en un dibujo de Leonardo Da Vinci y una cascara hiperboloide inspirada en el Restaurante los Manantiales, disenada por Felix Candela. Ambas estructuras fueron construidas utilizando un metodo rapido y economico: (1) la construccion de un encofrado 3D mediante el inflado de una membrana 2D anclada al suelo; (2) el revestimiento de la membrana por sucesivas capas de material compuesto de celulosa-hielo. Este articulo describe el proceso de diseno y construccion de la cascara hiperboloide.

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Perforated steel plate to laminated glass adhesive properties

P. A. S. Carvalho Paulo J. S. Cruz Fred Veer

The adhesive properties of steel perforated plates laminated inside two glass panes are determined by the type of interlayer but also by the hollowed surface of the perforated steel, which is fiduring the lamination process. The infl uence of both parameters has been investigated by a series of “pull-out” tests using perforated and non-perforated plates, with the same embedded area, laminated with PVB or a ionoplast interlayer. The results show that the anchoring effect when comparing perforated and non-perforated plate does not result in an increase of the adhesive strength (ionoplast specimens with perforated plates show a decrease), but gives a more ductile failure behaviour, in the case of PVB due a stretching-out of the interlayer infl uencing its slip mechanism and in the ionoplast caused by the earlier elongation of the perforated plate.

Laminated Glass

Lamination

Elongation

Anchoring

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Citations (9)

2‐D wavelet‐based adaptive‐grid method for the resolution of PDEs

AIChE Journal (2003)

J.C. Santos Paulo J. S. Cruz Fernão D. Magalhães Adélio Mendes

Abstract An efficient interpolating wavelet‐based adaptive‐grid numerical method is described for solving systems of bidimensional partial differential equations. The grid is dynamically adapted in both dimensions during the integration procedure so that only the relevant information is stored, saving allocation memory. The spatial derivatives are directly calculated in a nonuniform grid using cubic splines. Numerical results for five typical problems presented illustrate the efficiency and robustness of the method. The adaptive strategy significantly reduces the computational times and the memory requirements, as compared to the fixed‐grid approach.

Robustness

Multiresolution analysis

Grid method multiplication

10.1002/aic.690490314

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¹³C NMR study of presence of uron structures in amino adhesives and relation with wood‐based panels performance

Journal of Applied Polymer Science (2013)

Nuno Costa Daniela Martins João Pereira Jorge Martins João Ferra

ABSTRACT The chemical structure of amino adhesives produced by the strongly acid process was investigated by 13 C Nuclear Magnetic Resonance spectroscopy. This technique allowed the identification of functional groups and its quantitative determination. Concentration of cyclic polymeric structures (urons) was shown to be related with adhesive performance and with particleboard physico‐mechanical properties and formaldehyde content. Higher urons concentration presented lower viscosity and reactivity. Particleboards produced with resins with lower urons concentration presented lower formaldehyde content, but also lower internal bond strength. Wood‐based panels produced fulfilled E1 class requirements for formaldehyde emissions, indicating that strongly acid process is an alternative to the conventional alkaline–acid process. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4500–4507, 2013

Reactivity

Characterization

10.1002/app.39688

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Citations (11)

ECONOMIC STUDIES OF STEEL BUILDING FRAMES

Elsevier eBooks (1999)

Paulo J. S. Cruz

10.1016/b978-0-08-043570-1.50067-x

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Lifetime multi-objective optimization of maintenance of existing steel structures

Luís Neves Dan M. Frangopol Paulo J. S. Cruz

In this paper, the lifetime performance of deteriorating structures, defined by their time dependent condition index and reliability index, is analyzed. The effect of preventive and essential maintenance actions on performance and cost in predicted, and the optimal times of application of preventive and essential maintenance actions are found. Due to significant uncertainty in the initial performance, effects of deterioration and of maintenance actions, as well as, times of application and cost of maintenance actions, the analysis is performed in a probabilistic framework. The reduction in performance due to deterioration is simulated using an extension of the model proposed by Frangopol (1998). The probabilistic condition index, reliability index, and cumulative cost profiles are computed using Latin Hypercube simulation. Optimization of times of application is performed using genetic algorithms. Results show the significant importance of preventive maintenance actions in reducing the lifetime cost of existing structures, but also their fundamental role of essential maintenance action in keeping structures safe and serviceable during the entire lifetime.

Maintenance actions

Latin Hypercube Sampling

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Citations (7)

Experimental analysis of Perfobond shear connection between steel and lightweight concrete

Journal of Constructional Steel Research (2003)

Isabel Valente Paulo J. S. Cruz

Slab

Ductility (Earth science)

10.1016/s0143-974x(03)00124-x

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