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

Framing vulnerability, risk and societal responses: the MOVE framework
J. Birkmann, O. Cardona, M. Carreño, A. Barbat, M. Pelling, S. Schneiderbauer, S. Kienberger, M. Keiler, D. Alexander, P. Zeil, T. Welle

Natural Hazards (2013). 67, 193–211, DOI 10.1007/s11069-013-0558-5

Abstract
The paper deals with the development of a general as well as integrative and holistic framework to systematize and assess vulnerability, risk and adaptation. The framework is a thinking tool meant as a heuristic that outlines key factors and different dimensions that need to be addressed when assessing vulnerability in the context of natural hazards and climate change. The approach underlines that the key factors of such a common framework are related to the exposure of a society or system to a hazard or stressor, the susceptibility of the system or community exposed, and its resilience and adaptive capacity. Additionally, it underlines the necessity to consider key factors and multiple thematic dimensions when assessing vulnerability in the context of natural and socio-natural hazards. In this regard, it shows key linkages between the different concepts used within the disaster risk management (DRM) and climate change adaptation (CCA) research. Further, it helps to illustrate the strong relationships between different concepts used in DRM and CCA. The framework is also a tool for communicating complexity and stresses the need for societal change in order to reduce risk and to promote adaptation. With regard to this, the policy relevance of the framework and first results of its application are outlined. Overall, the framework presented enhances the discussion on how to frame and link vulnerability, disaster risk, risk management and adaptation concepts.
Abstract
The paper deals with the development of a general as well as integrative and holistic framework to systematize and assess vulnerability, risk and adaptation. The framework [...]
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Methodology and applications for the benefit cost analysis of the seismic risk reduction in building portfolios at broadscale
J. Valcárcel, M. Mora, O. Cardona, L. Pujades, A. Barbat, G. Bernal

Natural Hazards (2013). 69, 845–868, DOI 10.1007/s11069-013-0739-2

Abstract
This article presents a methodology for an estimate of the benefit cost ratio of the seismic risk reduction in buildings portfolio at broadscale, for a world region, allowing comparing the results obtained for the countries belonging to that region. This methodology encompasses (1) the generation of a set of random seismic events and the evaluation of the spectral accelerations at the buildings location; (2) the estimation of the buildings built area, the economic value, as well as the classification in structural typologies; (3) the development of vulnerability curves for each typology; (4) the estimation of the annual average loss of the buildings portfolio in the current conditions as well as in the case of a hypothetical structural intervention. The benefit cost ratio is estimated as the difference between the estimates of the present value of these two annual average losses, divided by the retrofitting costs. This methodology has been applied to the portfolio of public schools of 14 countries ofLatinAmerica and the Caribbean, for evaluating the feasibility of the seismic risk reduction at a national scale.
Abstract
This article presents a methodology for an estimate of the benefit cost ratio of the seismic risk reduction in buildings portfolio at broadscale, for a world region, allowing [...]
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Hybrid loss exceedance curve (HLEC) for disaster risk assessment
C. Velásquez, O. Cardona, M. Mora, L. Yamin, A. Barbat, M. Carreño, A. Barbat

Natural Hazards (2014). 72, 455–479, DOI 10.1007/s11069-013-1017-z

Abstract
Taken into account that the natural hazard risk is a contingent liability and, therefore, a sovereign risk for national governments, it is important to assess properly the potential losses to design a suitable risk reduction, retention and transfer strategy. In this article, a disaster risk assessment methodology is proposed based on two approaches: on the one hand, the empiric estimation of losses, using information available from local disaster databases, allowing estimating losses due to small-scale events and, on the other hand, probabilistic evaluations to estimate losses for greater or even catastrophic events, for which information usually is not available due to the lack of historical data. A ‘‘hybrid’’ loss exceedance curve is thus determined, which combines the results of these two approaches and represents the disaster risk in a proper and complete way. This curve merges two components: the corresponding to small and moderate losses, calculated using an inductive and retrospective analysis, and the corresponding to extreme losses, calculated using a deductive and prospective analysis. Applications of this risk assessment technique are given in this article for eleven countries.
Abstract
Taken into account that the natural hazard risk is a contingent liability and, therefore, a sovereign risk for national governments, it is important to assess properly the [...]
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Probabilistic earthquake risk assessment using CAPRA: application to the city of Barcelona, Spain
M. Marulanda, M. Cardona, M. Ordaz, A. Barbat

Natural Hazards (2013). 69(1), 59–84, DOI 10.1007/s11069-013-0685-z

Abstract
The risk evaluation model CAPRA (Comprehensive Approach to Probabilistic Risk Assessment) is a techno-scientific methodology and information platform, composed of tools for evaluating and communicating risk at various territorial levels. The model allows evaluating losses on exposed elements using probabilistic metrics, such as the loss exceedance curve, the expected annual loss and the probable maximum loss, useful for multi-hazard risk analyses. In this article, the process of probabilistic seismic risk analysis is described, explaining the main features of the CAPRA modules of hazard, vulnerability and risk estimation applied to the city of Barcelona, Spain. In addition, according to the physical risk results and the information on the socioeconomic indicators of the city, this article presents the holistic evaluation of seismic risk, which is a valuable result to facilitate the integrated risk management by the different stakeholders involved in risk reduction decision making.
Abstract
The risk evaluation model CAPRA (Comprehensive Approach to Probabilistic Risk Assessment) is a techno-scientific methodology and information platform, composed of tools for [...]
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Deterministic and Probabilistic Earthquake Scenarios for the Seismic Risk Analysis of URM Buildings
J. Avila-Haro, J. González-Drigo, Y. Vargas, L. Pujades, A. Barbat

Key Engineering Materials (2013). 525-526, 537-540, doi:10.4028/www.scientific.net/KEM.525-526.537

Abstract
Barcelona, as well as a large number of cities in the Mediterranean basin, has a housing stock composed of a large number of unreinforced brick masonry buildings. Motivated by different factors, the enlargement of the city (Eixample in Catalan) was held from the second half of the 19th century and the beginning of the 20th, a period in which a large number of buildings of this type were built, many of which are still used as dwellings. Although the buildings were built individually, some of them are linked to adjacent buildings by the side walls. This feature leads to the analysis of the buildings as isolated structures and also as an aggregate. Barcelona is located in a seismic region of low to moderate hazard, with macroseismic intensity between the grades VI and VII of the European macroseismic scale EMS'98. Based on the deterministic and probabilistic response spectra for the different types of soils present in Barcelona obtained in the work of Irizarry (2004), the seismic risk of four individual buildings and an aggregate is evaluated. The buildings are modeled and analyzed using the TREMURI program and MATLAB routines under the guidance of RISK-UE project.
Abstract
Barcelona, as well as a large number of cities in the Mediterranean basin, has a housing stock composed of a large number of unreinforced brick masonry buildings. Motivated [...]
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Nonlinear Response of Structures with Sliding Base lsolation
. L.Bozzo, A. Barbat

Journal of Structural Control (1995). 2(2), 59-77

Abstract
It is accepted that sliding or friction base isolation systems effectively protect structures subjected to severe earthquakes. Precise modeling of the sliding connection is, however, still difficult since various parameters influence the friction coefficient. Simplified models, such as those based on a constant friction coefficient, are convenient to understand the behavior of sliding structures and to identify general trends. However, this article shows that for final structural designs (and in particular if the building enters in the nonlinear range) these trends should be used carefully. The purpose oí the article is to discuss the general behavior of structures supported on sliding connections and to describe a simple numeric model to take into account variations in the friction coefficient. The numeric model enables to represent complex force-displacement relationships for the sliding bearings. The model is used to perform a preliminary evaluation of the influence in the response caused by changes in the friction coefficient for elastic and elasto-plastic structures. The variations in the friction coefficient are obtained from experimental testing for a class of teflon-based connections.
Abstract
It is accepted that sliding or friction base isolation systems effectively protect structures subjected to severe earthquakes. Precise modeling of the sliding connection is, [...]
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Seismic performance of buildings with a class of adaptive nonlinear hybrid systems
A. Barbat, J. Rodellar, N. Molinares, E. Ryan

Journal of Structural Control (1994). 1(1-2), 117-141

Abstract
A class of hybrid control system which combines a passive nonlinear base isolator with an active controller is analyzed. The passive component of the system has a hysteretic behaviour. A single control force is applied on the structural base by means of a new adaptive control strategy, not requiring knowledge of the system parameters and the excitation and able to handle the typical nonlinearities associated with base isolators. A numerical study is performed to assess the improvement of the behaviour of buildings equipped with this control system.
Abstract
A class of hybrid control system which combines a passive nonlinear base isolator with an active controller is analyzed. The passive component of the system has a hysteretic [...]
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Dynamic System Characterization via Eigenvalue Orbits
J. Marczyk, J. Rodellar, A. Barbat

JOURNAL OF GUIDANCE , CONTROL , AND DYNAMICS (1999). 22(3), 447-454, doi.org/10.2514/2.4417

Abstract
A new model-free approach for the description of general dynamicalsystems with unknownstructure, order, and excitation is introduced. The approach is based on the new concept of eigenvalue orbit. The eigenorbits are obtained by building an associated linear time-variant system through a matrix that relates the output measurements in a moving horizon window and viewing the trajectories of its time-varying eigenvalues. How the eigenorbits may be computed from the measurements and used for the characterization of the original system is shown. The basic properties of the eigenorbits are presented via a series of theorems for the case of a discrete-time, linear timeinvariant system. A set of examples are included to illustrate these properties for more general classes of systems and to suggest some practical issues that can be drawn from the orbits.
Abstract
A new model-free approach for the description of general dynamicalsystems with unknownstructure, order, and excitation is introduced. The approach is based on the new concept [...]
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Procedures Based on Composite FEM Technology for the Resolution of Concrete-Framed Structures with Masonry in-fills: Comparison with Mexican Building Code
C. Escudero, S. Oller, X. Martinez, A. Barbat

Journal of Engineering Mechanics, ASCE (2017). 143(9), 04017080-1 -- 04017080-19

Abstract
The construction of confined masonry buildings has become a good choice to meet the housing needs of low-income families in big cities. Despite this, current building codes for such construction allow the use of highly simplified analysis techniques that have hardly changed in the last 40 years. This paper is based on numerical simulation and discusses the need to combine and improve existing techniques in finite-element method (FEM) analysis for composite materials, to assess the overall structural behavior of reinforced concrete structures with masonry in-fills, and consequently to support the derivation of rational rules for analysis and design. Through the use of a simple yet powerful shell finite element (FE), state-of-the-art theories of mixtures to analyze composite materials, a computational tool to generate the volume fraction of composites, and the Mexican building code, this paper attempts to be a guide to numerical reproduction of the overall behavior of confined masonry structures.
Abstract
The construction of confined masonry buildings has become a good choice to meet the housing needs of low-income families in big cities. Despite this, current building codes [...]
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Predictive control of structures
J. Rodellar, A. Barbat, J. Martín-Sánchez

Journal of Engineering Mechanics, ASCE (1987). 113(6), 797-812

Abstract
Different continuous-time approches have been proposed in recent years to formulate active control algorithms to reduce the response of civil engineering structures under dynamic excitations. In this paper, a general formulation of a new discrete-time control methodology is presented and applied to structural control. This methodology, based on the concept of predictive control, is discussed and compared to the optima! control methodology by means of numerical examples.
Abstract
Different continuous-time approches have been proposed in recent years to formulate active control algorithms to reduce the response of civil engineering structures under [...]
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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

Framing vulnerability, risk and societal responses: the MOVE framework

Methodology and applications for the benefit cost analysis of the seismic risk reduction in building portfolios at broadscale

Hybrid loss exceedance curve (HLEC) for disaster risk assessment

Probabilistic earthquake risk assessment using CAPRA: application to the city of Barcelona, Spain

Deterministic and Probabilistic Earthquake Scenarios for the Seismic Risk Analysis of URM Buildings

Nonlinear Response of Structures with Sliding Base lsolation

Seismic performance of buildings with a class of adaptive nonlinear hybrid systems

Dynamic System Characterization via Eigenvalue Orbits

Procedures Based on Composite FEM Technology for the Resolution of Concrete-Framed Structures with Masonry in-fills: Comparison with Mexican Building Code

Predictive control 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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