Javier Ortega Heras

Javier Ortega Heras
Spanish National Research Council | CSIC · Centro de Tecnologías Físicas "Leonardo Torres Quevedo"

PhD

About

44
Publications
12,812
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283
Citations
Introduction
Javier Ortega is an architect with a PhD in Civil Engineering. His research focused on the field of conservation of historical and vernacular structures (e.g. non-destructive testing, structural analysis, seismic vulnerability assesment). He is currently a MSCA fellow at ITEFI, aiming to develop novel non-destructive inspection tools for the mechanical characterization of historical masonry, through the 3D internal reconstruction of masonry assemblies using acoustic wave propagation techniques.
Additional affiliations
January 2022 - present
Spanish National Research Council
Position
  • PostDoc Position
Description
  • Participation in research projects related with the preservation of historical constructions and development of novel non-destructive tools and techniques. DocumeNDT Research Project: https://cordis.europa.eu/project/id/101030275
August 2018 - October 2021
University of Minho
Position
  • PostDoc Position
Description
  • Participation in R&D projects within the historical masonry group dedicated to the preservation of historical constructions
January 2014 - July 2018
University of Minho
Position
  • PhD Student
Description
  • Participation in research projects related with the preservation of historical constructions and vernacular architecture within the historical masonry group (HMS)
Education
March 2014 - July 2018
University of Minho
Field of study
  • Civil Engineering
April 2013 - July 2013
University of Minho
Field of study
  • Civil Engineering
September 2012 - March 2013
University of Padova
Field of study
  • Civil Engineering

Publications

Publications (44)
Article
Full-text available
A new versatile and geometrically reconfigurable ultrasonic tomography system (UTS) has been designed to inspect and obtain information about the internal structure and inner damage of columns in heritage buildings. This nondestructive system is considered innovative because it aims to overcome common limitations of existing systems. Tomographic in...
Article
Full-text available
The Alhambra is a UNESCO World Heritage Site located in Granada, which is the area with the highest seismic hazard in Spain. The present work focuses on the seismic safety evaluation of the Torre de la Vela, the main tower of the Alcazaba, the fortress of the Alhambra and the first area of the citadel built in the 13th century. The safety evaluatio...
Article
Full-text available
Brick masonry veneer walls connected to infill walls inserted in a reinforced concrete (RC) frame are a common constructive system in Portugal. The stability of the veneer wall is ensured by ties that make the connection with the masonry infill walls. These ties enable the transferring of out-of-plane loads to the main structure due to wind, and pa...
Conference Paper
Full-text available
El presente trabajo de investigación muestra los avances realizados a partir del proyecto DBMC 2020 en el estado de Michoacán, México, respecto al estudio y análisis de la vivienda vernácula y el patrimonio arquitectónico monumental de la región. A partir de una metodología interdisciplinar de estudio se combinaron el trabajo de campo en comunidade...
Book
Full-text available
The Heritage Within (HWITHIN) European Research Project aimed to develop an innovative approach to present buildings and archaeological ruins. The project proposed to implement state-of-the-art technologies to produce an innovative visualization of the cultural heritage by showing what is hidden to our naked eye and the unknown, nonvisible features...
Conference Paper
Full-text available
Built vernacular heritage embraces buildings that are not designed by specialists, but are part of a process that involves many people over many generations and relies on empirical knowledge. Its value as a key-element for cultural identity is unquestionable. However, precisely due to its empirical and traditional nature, it is often seen as an obs...
Conference Paper
Full-text available
Santa Maria de Azurara church is a XVI century church in Portugal, classified as a national monument since 1910. The building shows not only the influence of the Manueline architectural style (Portuguese late Gothic style), but also Baroque and Mannerism styles. Presently, the church presents some structural and non-structural problems, so an inspe...
Article
The shear properties are key characteristics for evaluating masonry elements under in-plane horizontal actions. Historical structures may need the evaluation of these properties in order to perform safety evaluations, diagnoses, retrofitting, etc. These properties are often difficult to estimate and may be measured using Destructive Testing (DT) me...
Article
Full-text available
Structural assessment and seismic vulnerability of ancient masonry buildings is a difficult task even when employing advanced specialized technical skills, which requires a complex study. This paper aims to assess the structural and seismic safety of the Esfahan Shah Mosque in Iran by numerically investigating the nonlinear behavior of the mosque f...
Article
The work presents the study carried out to build a database of mechanical properties related to the most recurring two-leaf stone masonry wall typologies. The main objectives of this study are: (1) to perform a systematic review of experimental studies (2) to apply a data fusion technique, based on a Bayesian framework, to update the selected mecha...
Chapter
As it is recognized, the definition of rehabilitation and seismic retrofitting strategies and solutions for traditional buildings with load-bearing masonry walls requires an adequate characterization of their material properties and construction solutions. The lack of knowledge on the behavior of traditional constructions frequently leads to the ad...
Preprint
Discontinuous double shell domes (DDDs) are a construction typology commonly used in Iranian architecture. They are very diverse in terms of geometry and construction techniques. The preservation of these domes, which often represent the most vulnerable parts of the buildings, requires adequate structural analysis. However, this is still an insuffi...
Article
Discontinuous double shell domes (DDDs) are a construction typology commonly used in Iranian architecture. They are very diverse in terms of geometry and construction techniques. The preservation of these domes, which often represent the most vulnerable parts of the buildings, requires adequate structural analysis. However, this is still an insuffi...
Article
The city of Vila Real de Santo António (VRSA) was erected after the 1755 Lisbon earthquake following a Pombaline development similar to the well-known reconstruction of Lisbon downtown. It included seismic-resistant measures at an urban and architectural level, but most original buildings have nowadays been replaced or are highly altered. A researc...
Conference Paper
Traditional masonry buildings located in seismic prone areas often present construction techniques empirically developed to improve the buildings seismic performance, for example by enhancing their box-behaviour in order to avoid premature out-of-plane failure of masonry walls. Often, earthquake-resistant techniques consist of a combination of loca...
Article
The main goal of the work is to assess the efficiency of traditional earthquake resistant solutions to improve the out-of-plane performance of stone masonry walls. Therefore, the present paper presents the results of an experimental campaign and numerical analysis performed on three stone masonry walls with a U-shaped plan configuration. Two of the...
Article
Aiming at protecting the vernacular heritage located in earthquake prone areas, the paper presents the development and validation of the numerical tool that constitutes the core of a novel seismic vulnerability assessment method: Seismic Assessment of the Vulnerability of Vernacular Architecture Structures (SAVVAS). An extensive numerical modeling...
Article
Full-text available
Tendo como principal objetivo contribuir para o melhor entendimento do comportamento fora de plano dos elementos de alvenaria de pedra, este artigo apresenta os resultados de uma campanha experimental e numérica realizada em duas paredes em forma de U e representativas da arquitetura vernacular portuguesa. Foram realizados ensaios não destrutivos n...
Article
The valorization and preservation of vernacular architecture, as well as traditional construction techniques and materials, is a key-element for cultural identity. Conservation efforts are often mainly focused on historical constructions and monuments. Furthermore, more detailed and sophisticated seismic vulnerability assessment approaches typicall...
Article
The paper presents and discusses the application of two large scale seismic vulnerability assessment methods on the island of Faial in Azores (Portugal). The two methods are specifically conceived to assess the seismic vulnerability of vernacular architecture. The first method follows a classical seismic vulnerability index approach and is referred...
Poster
Full-text available
This work primarily aims at the comparison of the results obtained with two different modelling strategies applied to simulate the behaviour of two U-shaped stone masonry walls built with earthquake-resistant techniques. The tested stone masonry walls prototypes have characteristics commonly found in vernacular buildings in northern Portugal. The...
Conference Paper
Despite the research interest concerning the study of the out-of-plane behaviour of masonry walls, there is still a limited understanding of this phenomenon. The paper presents the experimental campaign carried out in order to characterize the OOP behaviour of three U-shaped stone masonry walls. WALL 0 is unreinforced whereas WALL 1 and WALL 2 were...
Conference Paper
FE method is a useful and powerful tool widely applied to the structural analysis of masonry constructions. One of the main challenges related to the numerical simulations is the use of adequate constitutive materials models able to replicate, in an accurate way, the non-linear behaviour of masonry. Thus, the experimental characterization of the ma...
Article
Specific architectural elements can be identified in constructions located in regions frequently exposed to earthquakes. These earthquake resistant features were developed empirically by local communities to protect their built-up environment. Research in these traditional practices, resulting from a local seismic culture, is a relevant and positiv...
Article
Full-text available
The awareness and preservation of the vernacular heritage and traditional construction techniques and materials is crucial as a key element of cultural identity. However, vernacular architecture located in earthquake prone areas can show a particularly poor seismic performance because of inadequate construction practices resulting from economic res...
Article
Aiming at contributing to the better understanding of the out-of-plane behavior of unreinforced stone masonry structures, this paper presents the results of an experimental and numerical campaign performed on two U-shaped walls with different masonry bonds representative of Portuguese vernacular architecture. The experimental campaign included non-...
Article
Specific architectural elements can be identified in constructions located in regions frequently exposed to earthquakes. These earthquake resistant features were developed empirically by local communities to protect their built-up environment. Research in these traditional earthquake resistant practices, resulting from a local seismic culture, is a...
Conference Paper
Full-text available
RESUMO Este artigo apresenta o trabalho experimental para a caracterização de paredes de alvenaria de pedra (granito) para ações fora do plano. A parede tem uma configuração em U e o aparelho é de junta seca. Procura-se com este ensaio identificar a capacidade resistente e de deformação, o padrão de fendilhação, os mecanismos de colapso da alvenari...
Chapter
The well-known timber frame Pombalino construction system was devised after the 1755 Lisbon earthquake by the Portuguese government and its use was mandatory for the complex reconstruction process carried out in the city. It can be considered as the first technical regulation regarding seismic resistance. However, its use was not limited to Lisbon...
Chapter
Full-text available
This paper presents the numerical seismic analysis of isolated vernacular buildings characteristic of Alentejo region, which is considered a medium seismic hazard region in Portugal. A representative isolated building was selected from a database and geometric model was defined for the numerical pushover analysis. Subsequently, a parametric analysi...
Chapter
Full-text available
Following with detailed studies of Portuguese vernacular building typologies, this paper deals with buildings located in historical urban centers. An analysis of the history of the urban centre and, in particular, of some vernacular buildings is pointed. Additionally, a discussion of the influence of changes of the geometry and of added built volum...
Chapter
Full-text available
Considering that vernacular architecture may bear important lessons on hazard mitigation, this chapter focuses on the European Mediterranean countries and studies traditional seismic resistant architectural elements and techniques that local populations developed to prevent or repair earthquake damage. This area was selected as a case study because...
Conference Paper
Full-text available
Considering that vernacular architecture may bear important lessons on hazard mitigation and that well-constructed examples showing traditional seismic resistant features can present far less vulnerability than expected, this study aims at understanding the resisting mechanisms and seismic behavior of vernacular buildings through detailed finite el...
Conference Paper
Full-text available
The well-known timber frame Pombalino construction system was devised after the 1755 Lisbon earthquake by the Portuguese government and its use was mandatory for the complex reconstruction process carried out in the city. It can be considered as the first technical regulation regarding seismic resistance. However, its use was not limited to Lisbon...
Article
Box-buildings are structural masonry buildings named as such because of their shape. There are around 5000 of them in Recife, Brazil. This paper presents a safety analysis of one box-building that suffered collapse on December 2007. The research aims at quantifying the safety of this type of existing buildings and at better understanding their stru...
Conference Paper
Full-text available
Specific architectural elements can be identified in vernacular constructions located in regions frequently exposed to earthquakes. Such elements are the result of a seismic culture which has been empirically developed during centuries so that the vulnerability of the buildings is reduced. This research is based on the fact that vernacular architec...

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Projects

Projects (4)
Project
The RAMBEA project aims at developing a novel computational strategy for accurate and efficient simulations of historical masonry bridges subject to extreme environmental actions, including loadings induced by earthquakes and flooding. The aim is to provide a comprehensive tool for realistic assessment with the potential of transforming current practice related to strengthening of critical assets, contributing to an increased resilience of the built environment and the preservation of important elements of the architectural heritage, thus responding to the safety and socio-economic needs. Old masonry bridges still play a critical role within the European transportation system. Moreover, they belong to the architectural heritage representing a valuable expression of past construction technology. Many of these structures are located in seismic regions and in areas subject to floods and hydrogeological instability which have been aggravated by climate change. Thus they can be exposed to extreme environmental actions which may potentially lead to bridge failure causing significant economic damage and the loss of structures with cultural and historical value. Currently, the response of masonry bridges under extreme loading is evaluated using simplified models due to the lack of efficient detailed models. However, these approaches do not allow for the complex 3D behaviour potentially leading to unrealistic and unsafe predictions. The main challenge of this project is the development of a more advanced strategy, based on a novel numerical description allowing for the 3D interaction between the different bridge components under extreme loading. More specifically, within the project it will be developed an efficient 3D finite element representation with macro-elements for the masonry parts of the bridge, an accurate description for the physical interface between masonry and backfill and an effective model calibration strategy utilising the results of non-destructive tests.
Project
The present research aims to: - Gather insight on the influence of key factors in the out-of-plane behavior of multiple-leaf stone masonry walls. It is also intended to account for the uncertainty of the key factors, such as material properties, boundary conditions or connection level. - Propose a method to estimate out-of-plane strength and deformation capacity according to different key influencing factors; - Propose effective strengthening solutions to reduce seismic vulnerability