João Pereira

João Pereira
University of Minho · Institute for Sustainability and Innovation in Structural Engineering (ISISE)

PhD

About

51
Publications
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218
Citations

Publications

Publications (51)
Article
In civil engineering there is a need for lightweight structural elements, specifically in applications such as the rehabilitation of degraded floors in existing buildings and modular construction. Metaheuristic search procedures are suitable to tackle optimization problems concerning material efficiency, but their use in real design applications is...
Chapter
A new lightweight floor system was developed to tackle the sustainability issue in the construction sector. The proposed flooring system is suited for rehabilitation of degraded timber floors in existing building. Despite the great potential that sandwich construction shows as load bearing elements their use has been hindered by the high initial co...
Chapter
In the scope of the research project “Lightslab - development of innovative slab solutions using sandwich panel” a new floor system based on sandwich panel has been developed. The lightweight structural system shall be a competitive solution when compared to traditional rehabilitation technique of degraded timber floors in old buildings. The layout...
Article
Full-text available
Historic monuments and construction capture the knowledge of civilizations of the past and are a source of pride for people of the present. Over the centuries, these buildings have been at risk from natural and man-made causes. The Alhambra, a UNESCO World Heritage Site in Granada, Spain, is one of such places. This paper aims to evaluate the struc...
Article
Industrial vessels used in high temperature processes of steel and cement production are protected by refractory linings built with mortarless joints. These dry joints, formed by stacked bricks have a crucial importance on the mechanical behaviour of the lining. The stiffness and consequently the stresses generated by the thermal elongation are red...
Article
The seismic assessment and modelling of unreinforced masonry structures require an adequate understanding of masonry behaviour under shear loading. In particular, the behaviour of the interfaces connecting brick and mortar are of key importance during seismic actions. This is because the unit-joint interface may act as the main plane of weakness in...
Article
Vessels used in industrial high temperature processes of steel and cement production are protected by refractory linings built with dry-stacked masonry, which plays a crucial role on the overall behaviour of the vessels. This paper presents the results of an experimental and numerical research on dry-joint refractory masonry subjected to uniaxial c...
Article
Masonry is one of the oldest and most traditional materials in building construction. Nevertheless, the knowledge on the structural fire behaviour of masonry elements is not yet well consolidated. The literature on the load-bearing capacity of masonry walls in case of fire showed an enhanced performance of these elements, however the lack of normat...
Article
Unreinforced masonry construction is predominant in many urban areas world-wide. Many of these constructions are vulnerable to earthquakes, which are the main cause of damage and loss of cultural heritage. Understanding the in-plane behaviour of masonry walls when subjected to horizontal loadings will improve the society capacity to preserve and pr...
Article
Confined masonry (CM) is a widely used solution for buildings in developing countries and has potential for worldwide application when considering its economic and constructive advantages. Although a large background of experimental testing of CM walls is available, numerical studies are further needed to extend the existing knowledge and derive an...
Article
This paper presents mesoscale thermo-mechanical analyses of plain (unreinforced) concrete based on the discrete element method (DEM). The proposed discontinuum modelling strategy represents the aggregates and matrix as a system of deformable polyhedral blocks, interacting along their boundaries. The nodal velocities of each block are calculated via...
Article
This paper presents a 2-D finite element (FE) based micro modelling framework for thermo-mechanical response history analysis of solid brick masonry structures subjected to fire. The 2-D FE framework considers geometric and material nonlinearities, and transient states of strain in conjunction with the temperature-dependent material properties. Mat...
Conference Paper
In the scope of a R&D project, the design of three new lightweight flooring panels with distinct characteristics was performed, namely: i) two steel face sheets, steel webs and polyurethane (PUR) foam as core system; ii) steel face sheets, glass fiber-reinforced polymer (GFRP) webs and PUR foam core system; iii) two steel face sheets and two steel...
Conference Paper
This paper presents a numerical study on the structural behaviour of concrete masonry at elevated temperatures. Based on an experimental research previously performed on half-scale walls in fire situations, numerical models were developed and validated. The heat transfer models led to thermal fields with good agreement with the temperatures measure...
Conference Paper
The understanding of the compressive and tangential behaviour of mortarless joints is mandatory to optimize the design of refractory linings. The joints play an important role during the heating of the equipment, as they reduce the stresses generated due to thermal expansion. This study investigates the normal and tangential behaviour of joints in...
Conference Paper
Refractory masonry in its application is usually exposed to chemical, thermal and mechanical loads in service. Mechanical loads develop from the thermal expansion of the refractories which is confined either by the regions of different temperature within the structure or by the boundary conditions. The aim of this work is to investigate, using nume...
Conference Paper
Full-text available
The response of masonry structures is well studied in the context of static and dynamic mechanical loading. However, studies pertaining to thermo-mechanical response characterization of masonry structures subjected to fire are very limited. Moreover, within the limited investigations pertaining to the numerical response of masonry structures subjec...
Conference Paper
Refractory masonry in its application is usually exposed to chemical, thermal and mechanical loads in service. Mechanical loads develop from the thermal expansion of the refractories which is confined either by the regions of different temperature within the structure or by the boundary conditions. The aim of this work is to investigate, using nume...
Conference Paper
Refractories are unique materials used in linings of vessels to contain and process fluids at high temperatures. They can withstand complex combination of thermo-mechanical stresses and chemical wear generated by fluids and chemical agents during process. The main challenges for the usage of refractories are linked to the cost, availability of raw...
Article
Full-text available
As alvenarias têm sido usadas ao longo dos séculos em paredes estruturais ou simples de compartimentação. Nos últimos 50 anos, houve algumas investigações para avaliar a resistência ao fogo de paredes de alvenaria de diversos materiais, sendo um deles o concreto. Em 1970, Byrne [1] realizou 14 ensaios de resistência ao fogo em paredes estruturais d...
Conference Paper
Fiber Reinforced Polymers have become a popular material for strengthening of masonry structures. The performance of this technique is strongly dependent on the bond between the FRP and the substrate. This work aims to study the behavior of the bond between different strengthening systems (EBR and NSM), different materials (GFRP and CFRP) and diffe...
Conference Paper
Unreinforced masonry construction is predominant in many urban areas worldwide. Many of these constructions are vulnerable to earthquakes, which are the main cause of damage and loss of cultural heritage. Understanding the in-plane behavior of masonry walls when subjected to horizontal loadings will improve the society capacity to preserve and prot...
Conference Paper
The construction in masonry is one of the oldest ways of construction. However, the knowledge regarding its structural behavior is still not well consolidated, especially regarding extreme conditions, such as fire. Although the few available studies regarding structural masonry under fire conditions show some promising results, still the available...
Chapter
This chapter presents the analysis of the structural condition and stability of the Medieval Armenian Church in Famagusta. The chapter includes photographic survey, visual inspection, non-destructive testing, and advanced computational analyses. The structural performance of the Church was analyzed by means of a numerical model, which helped simula...
Article
The strain rate effect influences the mechanical properties on most construction materials and its investigation is critical for structural engineering. Current materials such as steel or concrete have been intensively investigated. However, similar studies on the dynamic properties of masonry or masonry components such as clay brick or mortar are...
Article
Fibre reinforced polymers (FRP) have become a popular material for strengthening of masonry structures. The performance of this technique is strongly dependent on the bond between the FRP and the substrate. Understanding the strain rate effect on these materials and strengthening techniques is important for proper design and proper modelling of the...
Conference Paper
Full-text available
The occurrence of unanticipated extreme events in modern societies typically induces significant damage and losses to the built heritage and people, but also concern and fear in the population. The capacity of structures to resist to extreme events has been deserving the attention of researchers during the last decades. The occurrence of explosion-...
Article
The vulnerability of the masonry envelop under blast loading is considered critical due to the risk of loss of lives. The behaviour of masonry infill walls subjected to dynamic out-of-plane loading was experimentally investigated in this work. Using confined underwater blast wave generators (WBWG), applying the extremely high rate conversion of the...
Conference Paper
This work intends to present a newly developed test setup for dynamic out-of-plane loading using underWater Blast Wave Generators (WBWG) as loading source. Underwater blasting operations have been, during the last decades, subject of research and development of maritime blasting operations (including torpedo studies), aquarium tests for the measure...
Article
Full-text available
The work presented in this paper was performed in collaboration with one of the largest Public Transportation Operator in Portugal and addresses the problem of risk assessment due to terrorist actions involving explosions at different levels. First, a region of the Operator is selected. The elements in the Operator's network with the highest associ...
Conference Paper
Full-text available
Fiber Reinforced Polymer (FRP) composites have received extensive attention in the last years for Externally Bonded Reinforcement (EBR) of masonry structures. It is well known that the FRP-to-masonry bond behavior is a critical mechanism in this strengthening technique. Several experimental and numerical investigations have thus been devoted to inv...
Conference Paper
Full-text available
Investigation of the dynamic properties of construction materials is critical for structural engineering. The strain rate effect influences the properties of most constructions materials and this effect on materials such as concrete or steel has been intensively investigated. However, such studies on masonry materials are scarce. Understanding the...
Conference Paper
Full-text available
The vulnerability of the masonry envelop under blast loading is considered critical due to the risk of loss of lives. The dynamic behaviour of masonry infill walls subjected to dynamic out-of-plane loading was experimentally investigated in this work. Confined underwater blast wave generators (WBWG) allows applying an extremely high rate conversion...
Thesis
The work presented in this thesis was developed at the Department of Civil Engineering of University of Minho. This work involves experimental and numerical campaigns and intends to give a contribution for a better understanding of the effect of explosions. Blast loading is a subject of much actuality and considerable lack of expertise. Europe has...
Conference Paper
Full-text available
The vulnerability of the masonry envelop under blast loading is considered critical due to the risk of loss of lives. The dynamic behaviour of masonry infill walls subjected to dynamic out-of-plane loading was experimentally investigated in this work. Using confined underwater blast wave generators (WBWG), applying the extremely high rate conversio...
Conference Paper
Full-text available
Underwater blasting operations have been, during last decades, subject of research and development of maritime blasting operations, including torpedo studies. Aquarium tests, for the measurement of blasting energy of industrial explosives, are based in studies of confined underwater blast wave generators (WBWG). The present study shows the behavior...
Conference Paper
Investigation of the dynamic properties of construction materials is critical for structural engineering. The strain rate effect influences the properties on most constructions materials. This effect on materials such as concrete or steel has been intensively investigated. However, such studies on masonry materials such as clay bricks cannot be fou...
Article
In this paper the blast resistance of cracked steel structures repaired with fibre-reinforced polymer (FRP) composite patch are investigated. The switch box which has been subjected to blast loading is chosen to study. The steel material is modelled using isotropic hardening model, pertaining to Von Mises yield condition with isotropic strain harde...
Article
Full-text available
This article presents a study of the seismic behavior of the “Old Municipal Chambers” building in Christchurch, which was damaged by earthquakes in 2010 and 2011. In view of its seismic vulnerability and retrofitting, finite element and equivalent frame models were used for pushover analysis. Predictions allow identifying the weak parts of the buil...
Conference Paper
Full-text available
The Old Municipal Chambers is a Category I heritage building situated in Worcester Street, Christchurch. It was designed by architect Samuel Hurst Seager in the Queen Anne Arts and Crafts Style and was opened in 1887. The two storey building is constructed in solid brick and incorporates several decorative features, and it is an important part of t...
Article
Full-text available
Experimental and finite element analysis have been carried out for the static and dynamic response of lightweight metal boxes that are similar to the steel junction boxes on the site of Buncefield explosion [1,2]. During the Buncefield Explosion Mechanism Phase I research, the lightweight steel junction boxes on the site located within the area cov...
Article
The paper reports on two series of studies carried out to understand the Buncefield explosions (Explosion Mechanism Advisory Group, 2007; HSE, 2009). The first series of studies were carried out to aid understanding of the severe damages which indicated the possibility of explosion overpressures well above those in an open turbulent deflagration. T...
Conference Paper
Full-text available
In this paper the blast resistance of cracked steel structures repaired with fibre-reinforced polymer (FRP) composite patch are investigated. The switch box which has been subjected to blast loading is chosen for a detailed study. For impulsively loaded structures, the structural damage and response depends on the impulse rather than the pressure p...

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Projects

Projects (2)
Project
The ATHOR (Advanced THermomechanical multiscale mOdelling of Refractory linings) network is firstly dedicated to train researchers in multi engineering required fields for a better understanding of thermomechanical behaviour of refractory linings used in I&S applications. The project will cover all the main features of thermomechanical analysis of refractory linings including material characterization, impact of corrosion on thermomechanical properties, thermal shock resistance, modelling of non-linear thermomechanical behaviours, instrumentation of industrial devices and measurement in operation conditions. New testing methods and models will be developed to address the Scientific/Technological (S/T) challenges for these applications and help to design better performing refractory materials and linings. The research training is implemented through strong relationships between academia and industrial partners across the EU. The ATHOR network is structured to take full advantage of intensive cooperation between academia (AGH, MUL, RWTH, UMINHO, UNILIM, UORL), raw material suppliers (ALTEO, IMERYS), refractory producers (RHI-MAGNESITA, PYROTEK, ST-GOBAIN) and consumers (TATASTEEL) with a direct link to the FIRE federation. The main scientific objective of the ATHOR network is to adapt and develop the most advanced modelling strategies and experimental technologies to the field of refractory to be able to perform reliable computations and measurement in the temperature range of the applications of these materials. ATHOR targets the development of high-end engineering technologies in the fields of material’s science and numerical simulations to give a substantial contribution through the design of more robust and reliable refractory linings. Ultimately, it represents a reduction of the refractory costs, an increase of the equipment’s availability and an enhanced process control.
Project
This project is a part of ETN-EU project ATHOR (Advanced THermomechanical multiscale mOdeling of Refractory linings), which is an innovative, collaborative and interdisciplinary project that brings together 6 academic beneficiaries and 8 private partners. More information on this link: http://www.etn-athor.eu/