Research Interests: Constructive and Nave
Research Interests:
Research Interests:
Research Interests:
Research Interests: Engineering, Geography, Geology, Photogrammetry, Cultural Heritage, and 15 moreDocumentation, Heritage Conservation, LiDAR, Architectural Heritage, Correlation, Classification, Laser Scanning, Key words, Landslide, Digital Elevation Model, Digital Photogrammetry, Multi View Stereo, Data Processing, Orthoimage, and digital terrain model
Research Interests:
Research Interests:
Old masonry walls, which present a limited bending capacity, generally need strengthening in order to provide an overall seismic resistance to old buildings. To achieve such purpose an innovative strengthening technique was developed,... more
Old masonry walls, which present a limited bending capacity, generally need strengthening in order to provide an overall seismic resistance to old buildings. To achieve such purpose an innovative strengthening technique was developed, consisting in the application of an exterior render layer with a structural role. The flexural resistance improvement of such technique results from the mechanical properties of the materials used and requires a proper application procedure. This innovative solution, henceforth designated as “CFRP reinforced render”, consists of a lime base mortar reinforced with a carbon mesh, applied on one or both faces of the masonry wall. The reinforced render solution, developed within this study, aims to provide improved mechanical capabilities to the strengthened masonry walls while respecting the main principles for rehabilitation of ancient buildings. In particular, it complies with material authenticity/compatibility principle, because it is based on a lime base mortar, and with the structural compatibility principle, as it involves a distributed strengthening all over the main original structural elements—the masonry walls, instead of imposing unbalanced concentrated strength. In this context, an extensive experimental campaign was developed involving in-plane and out-of-plane full-scale bending tests on plain and on strengthened wall specimens reproducing the mechanical and geometrical characteristics of old masonry walls. Based on the experimental results obtained, a numerical approach was developed to simulate the behaviour of the plain and of the strengthened masonry walls for different geometrical configurations and for different mechanical parameters. Besides allowing a better understanding of the behaviour of the strengthening technique, the developed models presented in this paper may aid the design of CFRP reinforced render solutions.
Research Interests:
ABSTRACT An in-situ experimental testing campaign on stone masonry walls performed in the Volterra (Pisa, Italy) hospital complex is described herein. The test-site is a disused building, dated back to the early 1930s, which offered the... more
ABSTRACT An in-situ experimental testing campaign on stone masonry walls performed in the Volterra (Pisa, Italy) hospital complex is described herein. The test-site is a disused building, dated back to the early 1930s, which offered the opportunity to perform destructive and non-destructive tests with multiple purposes: the masonry mechanical characterization of a wide group of nearby similar buildings, the comparison of several testing methods applied on masonry with chaotic texture and the development of the innovative twin panel test procedure. In this context, the failure mode for panels under shear and compression forces was interpreted and, through the results obtained from different techniques (flat-jack test, drilling test, diagonal compression test and shear compression test), a safety domain shear vs. compression for the rubble masonry type was also drawn up. The cross validation of several testing methods can suggest strategies to determine shear strength, deformation properties and ductility capacity of stone masonry walls with highly irregular texture.
Research Interests:
Seismic Tests on the S. Vicente de Fora Model
O presente artigo debruca-se sobre a forma no âmbito da construcao tradicional abobadada. Trata-se duma abordagem dual da forma, isto e, considerada-a, por um lado, como um resultado de varios condicionalismos que a influenciam a... more
O presente artigo debruca-se sobre a forma no âmbito da construcao tradicional abobadada. Trata-se duma abordagem dual da forma, isto e, considerada-a, por um lado, como um resultado de varios condicionalismos que a influenciam a montante, como as caracteristicas dos materiais, natureza e magnitude das cargas e as leis da natureza que regem o seu comportamento e, por outro, explanam-se as consequencias estruturais e as influencias esteticas que resultam da adocao de determinada forma. Apresenta-se uma retrospetiva sumaria da evolucao das caracteristicas das construcoes ao longo dos tempos e relacionam-se essas caracteristicas com as formas adotadas pelas varias civilizacoes, de acordo com o dominio das tecnicas construtivas disponiveis. Aflora-se a forma numa perspetiva muitas vezes subalternizada, a sua vertente mecânica. Na verdade, a adocao de determinada forma esta intimamente relacionada com o desempenho mecânico que lhe esta subjacente, pelo que se referem alguns aspetos segun...
Research Interests:
... Prior to that, longitudinal cracks appeared in the arch ring beneath the inside edges of the spandrel walls. ... However, as mentioned in the report, longitudinal cracks ap-peared in the arch ring beneath the inside edges of the... more
... Prior to that, longitudinal cracks appeared in the arch ring beneath the inside edges of the spandrel walls. ... However, as mentioned in the report, longitudinal cracks ap-peared in the arch ring beneath the inside edges of the spandrel walls. ...
Research Interests:
RESUMO Neste artigo utilizaram-se os resultados de um ensaio experimental realizado na ponte de Bargower, tendo em vista dois objectivos essenciais: i) verificar a capacidade de um modelo numérico de elementos finitos para a simulação do... more
RESUMO Neste artigo utilizaram-se os resultados de um ensaio experimental realizado na ponte de Bargower, tendo em vista dois objectivos essenciais: i) verificar a capacidade de um modelo numérico de elementos finitos para a simulação do comportamento real de estruturas de alvenaria e ii) calibrar os parâmetros dos modelos não-lineares adoptados. O ensaio experimental referido, conduzido até à rotura da ponte, é simulado através de elementos finitos bidimensionais considerando dois níveis de discretização: i) um modelo simplificado onde o efeito do enchimento no extradorso do arco é simulado por molas horizontais de comportamento não-linear; ii) um modelo mais sofisticado onde o enchimento no extradorso é incluído explicitamente na malha de elementos finitos. Em ambos os casos, considera-se que os blocos que constituem o arco têm comportamento elástico linear; as juntas entre blocos do arco são simuladas através de interfaces de espessura nula e sem resistência à tracção. No modelo ...
Static loading and impact tests of ceramic alumina tiles have shown a very interesting behaviour of a tough, brittle, and high energy absorbing material. Strain gauges techniques and data acquisition were used throughout this research. A... more
Static loading and impact tests of ceramic alumina tiles have shown a very interesting behaviour of a tough, brittle, and high energy absorbing material. Strain gauges techniques and data acquisition were used throughout this research. A static-dynamic equivalence is done through a calibration procedure of the measuring system. The experimental strain history is completely acquired till the failure of the ceramic tile. Numerical simulation of impact tests gives additional insight on the complicated phenomena. Low velocity impact testing revealed different patters of failure, depending on the conditions of impact, and the capacity of this material to be used in particular purpose designed applications.
Research Interests:
The Church S. Francisco in Évora (Portugal) was built in the 15th century over a previous gothic church built at the end of the 13th century. To the splendour of the building contributed some of the most famous Portuguese architects,... more
The Church S. Francisco in Évora (Portugal) was built in the 15th century over a previous gothic church built at the end of the 13th century. To the splendour of the building contributed some of the most famous Portuguese architects, sculptors and painters of the 15th and 16th ...
Research Interests:
Reference : FP6 PROHITECH project: Volume 1: Intervention strategies for the seismic protection of h... ... Books : Book published as author, translator, etc. ... Jaspart, Jean-Pierre mailto [Université de Liège - ULg >... more
Reference : FP6 PROHITECH project: Volume 1: Intervention strategies for the seismic protection of h... ... Books : Book published as author, translator, etc. ... Jaspart, Jean-Pierre mailto [Université de Liège - ULg > Département Argenco : Secteur MS2F > Adéquat. struct. aux exig. de fonct.& perfor. techn.-écon. >] ... There is no file associated with this reference. ... All documents in ORBi are protected by a user license.
This paper presents the main characteristics of the Portuguese timbrel vault, known in Portugal as "abobadilha" or "abobadilha alentejana", after the region Alentejo where most examples are found. This... more
This paper presents the main characteristics of the Portuguese timbrel vault, known in Portugal as "abobadilha" or "abobadilha alentejana", after the region Alentejo where most examples are found. This research is part of an extensive study that culminates in a set of experimental and computational tests which aims to determine appropriate design rules for this type of structure. The rules, shapes and proportions of the timbrel vaults are compared with the geometric features of those described in European treaties of the 18th and 19th centuries. Experimental loading tests were performed on two simple timbrel vaults, the results of which are summarized in the present paper. The numerical model (based on the discrete element method) is intended to be used in the simulation of real structures, anticipating their structural capacity, without the need to perform new experimental tests. A comparison of the experimental results and the predictions obtained is also presented.
Research Interests: Engineering and CRC
Research Interests:
Research Interests:
This paper contains an overview of the seismic strengthening interventions in school buildings, within the scope of the School Building Modernization Programme. The selection of the schools to be retrofitted was based in the analysis of... more
This paper contains an overview of the seismic strengthening interventions in school buildings, within the scope of the School Building Modernization Programme. The selection of the schools to be retrofitted was based in the analysis of the time-frame for structural design codes in Portugal and the correspondent evolution of the construction practices and materials. This analysis led also to the identification of five building groups – “historical”, masonry wall with RC slabs, “no code” RC; “low code” RC, and other less typified building solutions (e.g.: precast RC). The major problems for each of the former five school building groups are generally presented. Some of these problems stem from the absence or use of outdated structural design codes, aggravated by constructive or detailing flaws. The implemented seismic strengthening procedures are outlined through a brief presentation of a collection of cases that exemplify the interventions in all the former main school building groups.
This article describes the research carried out to assess the efficiency and mechanical performance of aluminum alloys to be used in the production of hysteretic dissipative brace devices for the seismic protection of old reinforced... more
This article describes the research carried out to assess the efficiency and mechanical performance of aluminum alloys to be used in the production of hysteretic dissipative brace devices for the seismic protection of old reinforced concrete buildings. Two different standard aluminum alloys were considered: the 6082 and the 5083 alloys, supplied with the T6 and H111 tempers, respectively. Features such as the inelastic deformation capacity and energy dissipation under cyclic loading were evaluated from experimental results and several performance indexes were computed. Additionally, four heat treatments (tempers) were applied to the 6082 alloy, namely: two tempers considering solubilization followed by two different aging cycles (AG); and two tempers considering two different annealing treatments (AN). The influence of these tempers on the mechanical behavior of the 6082 alloy was assessed through monotonic tensile and cyclic tension-compression tests. The results and discussion about the mechanical performance of each of the tested alloys and tempers are also presented. A comparative analysis between mechanical performance of the standard alloys and the tempered 6082 alloys demonstrates the potential benefits induced by these tempers. The 6082 alloy annealed at 350 °C for 120 min (6082-AN350/120) has proved to be a promising solution in terms of its damage capacity and energy dissipation, representing a cost-effective solution in the production of extruded profiles with non conventional cross sections.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
In this work diagonal compression tests and triplet tests on rubble stone masonry specimens are described and the results obtained presented. For the tests carried out different dimensions of masonry specimens were adopted and two... more
In this work diagonal compression tests and triplet tests on rubble stone masonry specimens are described and the results obtained presented. For the tests carried out different dimensions of masonry specimens were adopted and two different types of mortar were used in the specimen’s construction, namely hydraulic and air lime mortar. The general objectives of the work presented herein are to determine: i) initial shear strength (cohesion) of masonry via diagonal compression test and ii) initial shear strength, or cohesion and coefficient of friction by triplet test. This study was developed within the scope of the national research project SEVERES (www.severes.org).
Rafter roofs, either gabled or hipped, were the traditional way to cover buildings in Portugal until the second half of the sixteenth century. Foreign architects and engineers, who designed in the late sixteenth century some Portuguese... more
Rafter roofs, either gabled or hipped, were the traditional way to cover buildings in Portugal until the second half of the sixteenth century. Foreign architects and engineers, who designed in the late sixteenth century some Portuguese large buildings, inspired local designers and new types of roof structures, allowing covering large spans, were adopted at the beginning of the seventeenth century. In what concerns roof structures, São Roque Church, in Lisbon, built in 1584, was one of the cases that greatl y influenced the Portuguese civil engineering. The main nave of São Roque Church is 17 meters wide and the traditional roof structures were not able to overcome such span. For that, the Italian architect Fillipo Terzi based his design in a roofing structure widely used in Italy, the “Palladiana” truss roof, but until then, unknown in Portugal. This “innovation” had become known by the Portuguese architects, engineers and building masters and in eighteenth century it was used when ...
Research Interests:
Rafter roofs, either gabled or hipped, were the traditional way to cover buildings in Portugal until the second half of the sixteenth century. Foreign architects and engineers, who designed in the late sixteenth century some Portuguese... more
Rafter roofs, either gabled or hipped, were the traditional way to cover buildings in Portugal until the second half of the sixteenth century. Foreign architects and engineers, who designed in the late sixteenth century some Portuguese large buildings, inspired local designers and new types of roof structures, allowing covering large spans, were adopted at the beginning of the seventeenth century. In what concerns roof structures, São Roque Church, in Lisbon, built in 1584, was one of the cases that greatl y influenced the Portuguese civil engineering. The main nave of São Roque Church is 17 meters wide and the traditional roof structures were not able to overcome such span. For that, the Italian architect Fillipo Terzi based his design in a roofing structure widely used in Italy, the “Palladiana” truss roof, but until then, unknown in Portugal. This “innovation” had become known by the Portuguese architects, engineers and building masters and in eighteenth century it was used when ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
This work presents the preliminary results for a retrofitting technique to use on the seismic reinforcement of ancient structures (buildings and others). The technique involves the replacement of masonry walls exterior or interior... more
This work presents the preliminary results for a retrofitting technique to use on the seismic reinforcement of ancient structures (buildings and others). The technique involves the replacement of masonry walls exterior or interior plasters or renders, with a retrofitting material that will significantly enhance the out-of-plane and in-plane mechanical behaviour of such walls, with major significance for the seismic response of the intervened structure. The reinforcement material (UHPPl) must respect the physical features and traits of the substratum in which it will be applied, as also its mechanical characteristics have the specific need to be consistent with the same substratum.
Research Interests:
ABSTRACT
Research Interests:
Research Interests:
Pseudo-dynamic and cyclic tests on a full-scale model of part of the cloisters of the São Vicente de Fora Monastery, in Lisbon, are reported. After a first set of pseudo-dynamic and quasi-static cyclic tests performed on the original... more
Pseudo-dynamic and cyclic tests on a full-scale model of part of the cloisters of the São Vicente de Fora Monastery, in Lisbon, are reported. After a first set of pseudo-dynamic and quasi-static cyclic tests performed on the original model, where local damages were observed, the model was retrofitted with four internal continuous bond anchors. A final campaign of quasi-static cyclic tests was carried out on the retrofitted model in order to investigate the effects of this retrofitting technique. The tests were carried out at the ELSA laboratory, JRC, and aimed at the characterization of the non-linear behavior of limestone-block structures under earthquake loading. Moreover, the assessment of the effectiveness of the retrofitting system was also a major objective of the test campaign. Local and overall stability of the stone-blocks, including columns and arches were assessed for large displacement amplitudes. Comparisons between the tests results before and after retrofitting allowe...
Research Interests:
In Lisbon and other southern European cities, old masonry buildings are generally exposed to a very high seismic risk due to high probability of earthquake occurrence. In order to preserve this architectural heritage and reduce the... more
In Lisbon and other southern European cities, old masonry buildings are generally exposed to a very high seismic risk due to high probability of earthquake occurrence. In order to preserve this architectural heritage and reduce the seismic risk, structural studies should be conducted to decide where and how strengthening techniques should be used. However, to obtain reliable results the structural models should be based on experimental results. This paper describes experimental and numerical studies carried to characterize the shear strength of rubble stone masonry walls. The described work was done within the scope of the research project Seismic Vulnerability of Old Masonry Buildings (www.severes.org). For the experimental program four rubble stone masonry walls (120cm×120cm×70cm) were built using traditional techniques and materials. Two types of mortar were used: air lime mortar (in two masonry specimens) and hydraulic lime mortar (in the other two specimens). The specimens were...
Research Interests:
ABSTRACT The present paper deals with the experimental study performed by diagonal compression tests on four rubble stone masonry panels (120cm120cm70cm) within the scope of the research project SEVERES aiming at characterizing the... more
ABSTRACT The present paper deals with the experimental study performed by diagonal compression tests on four rubble stone masonry panels (120cm120cm70cm) within the scope of the research project SEVERES aiming at characterizing the seismic behavior of old masonry buildings. In this research two types of mortar were used, namely two specimens were built with hydraulic lime and other two speci- mens were built with air lime mortar. The shear strength and the shear modulus of rubble stone panels were obtained. These results were compared with the values obtained by other authors and suggested by the Italian’s standards. It is important to refer that the experimental research allowed characterizing the mechanical properties of masonry panels, which were built using traditional techniques in order to sim- ulate old buildings in Portugal. Together with the experimental research, (additionally) numerical inter- pretation of the tests is also given in order to simulate the behavior of the panels.