Alex Barbat Profile : Scipedia

Alex Barbat 3535

Professor Emeritus at the Department of Civil and Environmental Engineering
Universitat Politècnica de Catalunya - BarcelonaTech International Centre for Numerical Methods in Engineering

Alex Barbat 3535

Professor Emeritus at the Department of Civil and Environmental Engineering
Universitat Politècnica de Catalunya - BarcelonaTech International Centre for Numerical Methods in Engineering

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Alex Barbat's technical and research reports

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Alex Barbat's Technical Reports is an online archive aimed at collecting, preserving, and disseminating digital copies of the technical reports written by prof [...]

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Alex Barbat's monographs

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Alex Barbat's Monographs is an online archive aimed at collecting, preserving, and disseminating digital copies of the monographs written by prof Alex [...]

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Alex Barbat's chapters of books

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Alex Barbat's Research Reports is an online archive aimed at collecting, preserving, and disseminating digital copies of the research reports written by prof [...]

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Alex Barbat's articles in WoS/Scopus journals

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Alex's Barbat Journal Papers is an online archive aimed at collecting, preserving, and disseminating digital copies of the scientific papers published [...]

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Documents published in Scipedia

Holistic Evaluation of Seismic Risk in Barcelona
M. Carreño, A. Barbat, O. Cardona, M. Marulanda

(2014). Assessment of Vulnerability to Natural Hazards, Elsevier, ISBN: 978-0-12-410528-7, 21-52

Abstract
Within the framework described in Chapter 1, this chapter shows the evaluation of the seismic risk of the city of Barcelona, Spain, by applying a probabilistic analysis. On this basis a holistic evaluation of risk is performed taking into account social fragilityand lack of resilience aspects. Finally, the evaluation of the disaster risk management performance is conducted.
Abstract
Within the framework described in Chapter 1, this chapter shows the evaluation of the seismic risk of the city of Barcelona, Spain, by applying a probabilistic analysis. On [...]
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Theoretical and Conceptual Framework for the Assessment of Vulnerability to Natural Hazards and Climate Change in Europe
J. Birkmann, A. Barbat, O. Cardona, M. Carreño, M. Pelling, S. Schneiderbauer, S. Kienberger, M. Keiler, D. Alexander, P. Zeil, T. Welle

(2014). Assessment of Vulnerability to Natural Hazards, Elsevier, ISBN: 978-0-12-410528-7, 1-19

Abstract
This chapter outlines a framework for multidimensional, holistic vulnerability assessment that is understood as part of risk evaluation and risk management in the context of Disaster Risk Management and Climate Change Adaptation. As a heuristic, the framework is a thinking tool to guide systematic assessments of vulnerability and to provide a basis for comparative indicators and criteria development to assess key factors and various dimensions of vulnerability, particularly in regions in Europe. However, it can also be applied in other world regions. The framework has been developed within the context of the research project MOVE (Methods for the Improvement of Vulnerability Assessment in Europe; www.move-fp7.eu) sponsored by the European Commission within the framework of the FP 7 program.
Abstract
This chapter outlines a framework for multidimensional, holistic vulnerability assessment that is understood as part of risk evaluation and risk management in the context [...]
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Numerical analysis of of repair and reinforcement of structures with FRP
S. Oller, M. Molina, J. Vielma, X. Martínez, A. Barbat, L. Nallim

(2014). Aplicaciones avanzadas de los materiales compuestos, Omnia Publishers, ISBN: 978-84-941872-9-2, 261-291

Abstract
In this chapter, we present a procedure to evaluate the local damage and global damage in structures subjected to static and dynamic actions, with special emphasis on the seismic problem. In addition to the formulation for the evaluation of damage, we introduce the concept of reinforcement and structural repair by using laminated epoxy matrix composites with carbon fiber reinforcement. For this purpose, the theory of mixtures is used to define a composite material from its basic components. Damage is also evaluated in these reinforced and/or repaired structures and the influence of these improvements on the overall damage assessment of the structure is discussed.
Abstract
In this chapter, we present a procedure to evaluate the local damage and global damage in structures subjected to static and dynamic actions, with special emphasis on the [...]
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Revealing the Impact of Small Disasters to the Economic and Social Development
M. Marulanda, O. Cardona, A. Barbat

(2011). Coping with Global Environmental Change, Disasters and Security, Springer, ISBN 978-3-642-17776-7, 575-584

Abstract
This chapter presents the results of the evaluation of the proneness of Colombia to small scale and chronic disasters, and the type of impact they have for the local and country development. This analysis detected the spatial variability and dispersion of vulnerability and risk in the country because of events that rarely enter the international or even national disaster databases. But these events pose an accumulative development problem for local areas and, given their overall probable impacts, for the country as a whole. First, the database of small disasters used is described to identify the strengths and weaknesses of the available data and how that information was prepared for this research. A conceptual framework regarding the impact of small disasters is then presented, to characterize the risk associated to this type of disasters together with a quantification of their effects and their economic costs in order to illustrate their relevance due to the accumulated impact and recurrence. Finally, the conclusions of the study are given, which identify new risk concepts: The concept of ‘intensive risk’ to refer to the concentrated risk manifesting infrequently in specific locations, and the concept of ‘extensive risk’ to refer to the diffuse risk manifesting frequently over wide territories.
Abstract
This chapter presents the results of the evaluation of the proneness of Colombia to small scale and chronic disasters, and the type of impact they have for the local and country [...]
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Holistic Urban Seismic Risk Evaluation of Megacities: Application and Robustness
M. Carreño, O. Cardona, M. Marulanda, A. Barbat

(2009). The 1755 Lisbon Earthquake: Revisited, Springer, ISBN 978-1-4020-8609-0, 167-183

Abstract
From a holistic perspective, disaster risk requires a multidisciplinary evaluation that takes into account not only the expected physical damage, the number and type of casualties or economic losses, but also the conditions related to social fragility and lack of resilience conditions, which favor the second order effects when a hazard event strikes an urban center. In this chapter, the urban risk is evaluated using composite indicators or indices. Expected building damage and losses in the infrastructure, obtained from loss scenarios are basic information for the evaluation of the physical risk index in each unit of analysis. The holistic evaluation of disaster risk is achieved affecting the physical risk with an impact factor, obtained from contextual conditions, such as the socioeconomic fragility and the lack of resilience, that aggravate the physical risk. Available data about these conditions at urban level are necessary to apply the method. The model is explained and the benefits of this approach are illustrated, inviting to the risk management of urban centers.
Abstract
From a holistic perspective, disaster risk requires a multidisciplinary evaluation that takes into account not only the expected physical damage, the number and type of casualties [...]
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Neuro-fuzzy assessment of building damage and safety after an earthquake
M. Carreño, O. Cardona, A. Barbat

(2007). Intelligent computational paradigms in earthquake engineering, IDEA Group Publishing, ISBN: 1-59904-099-9, 123-157

Abstract
This chapter describes the algorithmic basis of a computational intelligence technique, based on a neuro-fuzzy system, developed with the objective of assisting nonexpert professionals of building construction to evaluate the damage and safety of buildings after strong earthquakes, facilitating decision-making during the emergency response phase on their habitability and reparability. A hybrid neuro-fuzzy system is proposed, based on a special three-layer feedforward artificial neural network and fuzzy rule bases. The inputs to the system are fuzzy sets, taking into account that the damage levels of the structural components are linguistic variables, defined by means of qualifications such as slight, moderate or severe, which are appropriate to handle subjective and incomplete information. The chapter is a contribution to the understanding of how soft computing applications, such as artificial neural networks and fuzzy sets, can be used to complex and urgent processes of engineering decision-making, like the building occupancy after a seismic disaster.
Abstract
This chapter describes the algorithmic basis of a computational intelligence technique, based on a neuro-fuzzy system, developed with the objective of assisting nonexpert [...]
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Seismic Evaluation of Low Rise RC Framed Building Designed According to Venezuelan Codes
J. Vielma, A. Barbat, R. Ugel, R. Herrera

(2013). Geotechnical and Structural Earthquake Engineering, INTECH, DOI: 10.5772/55158

Abstract
This chapter uses a mechanical method that involves non-linear analysis with deterministic and probabilistic approaches, as well as procedures of analysis based on limits states defined by displacements, in order to evaluate the behavior of a low rise RC building with plan irregularity designed according to Venezuelan codes and subjected to seismic actions. By using adequate structural models and computational tools, the seismic behavior of the building is obtained in a suitable way. Among these tools, the quadrants method was chosen, which provides the rapid assessment of the seismic capacity of a structure through its non-linear response. The results of the research show that the current design of this kind of structures is not safe when they are designed for the maximum seismic actions prescribed by codes. Therefore, it is necessary to review the design procedures in order to fulfill the goals of the performance-based design.
Abstract
This chapter uses a mechanical method that involves non-linear analysis with deterministic and probabilistic approaches, as well as procedures of analysis based on limits [...]
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Monte Carlo analysis of structural systems using neural networks
J. Hurtado, D. Álvarez, A. Barbat

(2001). MonteCarlo Simulation, Balkema, 265-271, ISBN: 90-5809-188-0

Abstract
Monte Carlo simulation is increasingly being used in the analysis of large and complex structural systems for the assessment of the uncertainty spread and the reliability. A major handicap for the popularization of this technology is the large number of deterministic evaluations needed to such purposes, inasmuch as linear or nonlinear finite element solvers are required for each output sample calculation. In order to simplify this task neural networks are evaluated in this paper as a partial surrogate of the deterministic solver. The neural networks are trained with the input/output pairs resulting from a few number of finite element simulations, and are henceforth used in a Monte Carlo context. It is shown that when employed in this way, neural networks constitute a promising tool for a drastic reduction of the computational cost needed by a Monte Carlo simulation in this field of application. Three types of networks have been selected for the study, two of which correspond to supervised and the other one to hybrid learning procedures. The paper compares the network designs in their more relevant aspects, which are the training speed and accuracy, the extrapolation ability and the accuracy of the estimated probabilities.
Abstract
Monte Carlo simulation is increasingly being used in the analysis of large and complex structural systems for the assessment of the uncertainty spread and the reliability. [...]
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Soil-structure-fluid seismic interaction
J. Miquel, A. Barbat

(2000). Estructuras sometidas a acciones dinámicas, CIMNE, 2000, 477-534, ISBN: 84-89925-68-2

Abstract
The behavior of structures subjected to earthquakes demonstrates that the phenomena of soil-structure and fluid-structure interaction have a great influence on the structural response, especially in the case of structures such as dams, tanks, elevated water tanks, marine platforms, intake towers, etc. The numerical study of these phenomena requires solving problems in which the coupling between two solids or between a solid and a fluid occurs only at the surfaces of contact between them. This chapter describes several numerical procedures used to solve the problem of seismic interaction. For this, it is necessary to have a record of seismic motion on the interface that separates the area of the soil considered in the analysis, which defines a theoretical surface sometimes called base rock. Below this, the soil can be assumed infinitely stiff or with a certain flexibility. To obtain an accelerogram at the level of the base rock, a deconvolution of the seismic motion available on the ground surface must be made. Then, this calculated accelerogram is applied on the soil-structure-fluid system.
Abstract
The behavior of structures subjected to earthquakes demonstrates that the phenomena of soil-structure and fluid-structure interaction have a great influence on the structural [...]
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Seismic risk of structures
O. Cardona, A. Barbat

(2000). Estructuras sometidas a acciones dinámicas, CIMNE, 2000, 369-397, ISBN: 84-89925-68-2

Abstract
From the perspective of disasters, risk has been defined in order to carry out its management, as well as to control the possible economic, social and environmental consequences that may occur in a specific area and time. This means that to estimate the risk it is necessary to take into account, from a multidisciplinary point of view, not only the expected physical damage, the victims or equivalent economic losses, but also social, organizational and institutional factors related to the development of the communities. At the urban level, for example, vulnerability, as an internal risk factor, must be related not only to the exposure of the material context or its physical susceptibility to being affected, but also to the social fragilities and the lack of resilience of the communities. In this chapter, conceptual, theoretical and practical problems related to seismic risk are presented. The definitions of hazard and seismic vulnerability, necessary to analyze the risk, are introduced. All the developments that are carried out are examined from the point of view of the possibilities of preventing seismic risk.
Abstract
From the perspective of disasters, risk has been defined in order to carry out its management, as well as to control the possible economic, social and environmental consequences [...]
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Articles (Documents not available in Scipedia)

Analysis of Ultra Low Cycle Fatigue problems with the Barcelona plastic damage model and a new isotropic hardening law
X Martinez, S Oller, LG Barbu, AH Barbat, AMP De Jesus

International Journal of Fatigue 73, 132-142, 2015
Hybrid loss exceedance curve (HLEC) for disaster risk assessment
CA Velásquez, OD Cardona, MG Mora, LE Yamin, ML Carreño, ...

Natural hazards 72 (2), 455-479, 2014
Capacity, fragility and damage in reinforced concrete buildings: a probabilistic approach
YF Vargas, LG Pujades, AH Barbat, JE Hurtado

Bulletin of earthquake engineering 11 (6), 2007-2032, 2013
Seismic safety of RC framed buildings designed according to modern codes
JC Vielma, Barbat A., Oller S.

Journal of Civil Engineering and Architecture 5 (7), 2011
Probabilistic seismic risk assessment for comprehensive risk management: modeling for innovative risk transfer and loss financing mechanisms
OD Cardona, MG Ordaz, L Yamín, S Arámbula, MC Marulanda, A Barbat

The 14th World Conference on Earthquake Engineering, 2008
Viscous damage model for Timoshenko beam structures
AH Barbat, S Oller, E Onate, A Hanganu

International Journal of Solids and Structures 34 (30), 3953-3976, 1997

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COLLECTIONS

Alex Barbat's technical and research reports

Alex Barbat's monographs

Alex Barbat's chapters of books

Alex Barbat's articles in WoS/Scopus journals

Documents published in Scipedia

Holistic Evaluation of Seismic Risk in Barcelona

Theoretical and Conceptual Framework for the Assessment of Vulnerability to Natural Hazards and Climate Change in Europe

Numerical analysis of of repair and reinforcement of structures with FRP

Revealing the Impact of Small Disasters to the Economic and Social Development

Holistic Urban Seismic Risk Evaluation of Megacities: Application and Robustness

Neuro-fuzzy assessment of building damage and safety after an earthquake

Seismic Evaluation of Low Rise RC Framed Building Designed According to Venezuelan Codes

Monte Carlo analysis of structural systems using neural networks

Soil-structure-fluid seismic interaction

Seismic risk of structures

Articles (Documents not available in Scipedia)

Analysis of Ultra Low Cycle Fatigue problems with the Barcelona plastic damage model and a new isotropic hardening law

Hybrid loss exceedance curve (HLEC) for disaster risk assessment

Capacity, fragility and damage in reinforced concrete buildings: a probabilistic approach

Seismic safety of RC framed buildings designed according to modern codes

Probabilistic seismic risk assessment for comprehensive risk management: modeling for innovative risk transfer and loss financing mechanisms

Viscous damage model for Timoshenko beam structures

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