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

COLLECTIONS

Sort publications:

Alex Barbat's technical and research reports

Scope

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

0
0
5/5
read

Alex Barbat's monographs

Scope

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

26
876
5/5
read

Alex Barbat's chapters of books

Scope

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

22
394
5/5
read

Alex Barbat's articles in WoS/Scopus journals

Scope

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

112
2790
5/5
read

Documents published in Scipedia

Prioritizing interventions to reduce seismic vulnerability in school facilities in Colombia
M. Mora, J. Valcárcel, O. Cardona, A. Barbat, L. Pujades, G. Bernal

Earthquake Spectra (2015). 31(4), 2535-2552, DOI: 10.1193/040412 EQS151T

Abstract
Colombian seismic code NSR-98 establishes the requirement for the seismic vulnerability analysis and, if necessary, the strengthening of public facilities (schools). Due to the investments required by risk reduction programs, it is necessary to establish criteria for assigning priorities for the interventions. This article proposes a methodology for obtaining a Benefit-Cost Ratio (BCR) at the subnational level, by assessing the expected annual average loss of the built area of public schools and the retrofitting cost. The BCR is estimated as the difference between the estimates of the net present value for status quo and retrofitted states, these two divided by the retrofitting costs. According to the BCR, 47.3% of the total school built area of Colombia should be retrofitted where the retrofitting costs correspond to 25% of the total investment. Proposed BCR is useful for prioritizing regions in function of the feasibility of reducing the seismic vulnerability of the schools.
Abstract
Colombian seismic code NSR-98 establishes the requirement for the seismic vulnerability analysis and, if necessary, the strengthening of public facilities (schools). Due to [...]
- 6
- read
Computational Tool for Post-Earthquake Evaluation of Damage in Buildings
M. Carreño, O. Cardona, A. Barbat

Earthquake Spectra (2010). 26(1), 63–86

Abstract
A method and a computational tool oriented to assist the damage and safety evaluation of buildings after strong earthquakes is described in this article. The input of the model is the subjective and incomplete information on the building state, obtained by inspectors which are possibly not expert professionals of the field of building safety. The damage levels of the structural components are usually described by linguistic qualifications which can be adequately processed by computational intelligence techniques based on neuro-fuzzy systems what facilitate the complex and urgent tasks of engineering decision-making on the building occupancy after a seismic disaster. The hybrid neuro-fuzzy system used is based on a special three-layer feedforward artificial neural network and fuzzy rule bases and is an effective tool during the emergency response phase providing decisions about safety, habitability, and reparability of the buildings. Examples of application of the computer program are given for two different building classes.
Abstract
A method and a computational tool oriented to assist the damage and safety evaluation of buildings after strong earthquakes is described in this article. The input of the [...]
- 29
- read
Damage scenarios simulation for seismic risk assessment in urban zones
A. Barbat, F. Moya, J. Canas

Earthquake Spectra (1996). 12(3), 371-394

Abstract
A methodology for simulating seismic damage of unreinforced mansonry buildings for seismic risk assessment of urban areas is presented in this paper. The methodology is based on the Italian vulnerability index and on the results of a post earthqueke damage survey study whose main result was an observed vulnerability function. The Monte Carlo method was than used to simulate damage probability matrices, fragility curves and vulnerability functions, all of which are the basis of a seismic risk study. The simulation process required the generation of thousands of hypothetical buildings, the analysis of their seismic behaviour and probabilistic studies of the computed results. As an example, probable damage scenarios werw developed for an urban area of Barcelona, Spain.
Abstract
A methodology for simulating seismic damage of unreinforced mansonry buildings for seismic risk assessment of urban areas is presented in this paper. The methodology is based [...]
- 16
- read
Revealing the socioeconomic impact of small disasters in Colombia using the DesInventar database
M. Marulanda, O. Cardona, A. Barbat

Disasters (2010). 34(2), 552 − 570

Abstract
Small disasters are usually the product of climate variability and climate change. Analysis of them illustrates that they increase difficulties for local development—frequently affecting the livelihoods of poor people and perpetuating their level of poverty and human insecurity—and entail challenges for a country’s development. In contrast to extreme events, small disasters are often invisible at the national level and their effects are not considered as relevant from a macroeconomic standpoint. Nevertheless, their accumulated impact causes economic, environmental and social problems. This paper presents the results of an evaluation of the DesInventar database, developed in 1994 by the Network for Social Studies in Disaster Prevention in Latin America. In addition, it proposes a new version of the Local Disaster Index developed in 2005 within the framework of the Disaster Risk and Management Indicators Program for the Americas, with the support of the Inter-American Development Bank.
Abstract
Small disasters are usually the product of climate variability and climate change. Analysis of them illustrates that they increase difficulties for local development—frequently [...]
- 6
- read
Disaster risk from a macroeconomic perspective: a metric for fiscal vulnerability evaluation
O. Cardona, M. Ordaz, M. Marulanda, M. Carreño, A. Barbat

Disasters (2010). 34(4), 1064 − 1083

Abstract
The Disaster Deficit Index (DDI) measures macroeconomic and financial risk in a country according to possible catastrophic scenario events. Extreme disasters can generate financial deficit due to sudden and elevated need of resources to restore affected inventories. The DDI captures the relationship between the economic loss that a country could experience when a catastrophic event occurs and the availability of funds to address the situation. The proposed model utilises the procedures of the insurance industry in establishing probable losses, based on critical impacts during a given period of exposure; for economic resilience, the model allows one to calculate the country’s financial ability to cope with a critical impact. There are limitations and costs associated with access to resources that one must consider as feasible values according to the country’s macroeconomic and financial conditions. This paper presents the DDI model and the results of its application to 19 countries of the Americas and aims to guide governmental decision-making in disaster risk reduction.
Abstract
The Disaster Deficit Index (DDI) measures macroeconomic and financial risk in a country according to possible catastrophic scenario events. Extreme disasters can generate [...]
- 7
- read
A numerical procedure simulating RC structures reinforced with FRP using the serial/parallel mixing theory
X. Martinez, S. Oller, F. Rastellini, A. Barbat

Computers and Structures (2008). 86, 1604–1618

Abstract
The use of fiber reinforced polymers (FRP) to reinforce and retrofit reinforced concrete (RC) structures has become one of the main applications of composites in civil engineering. This paper describes a procedure, based on a finite element formulation, that can be used to perform numerical simulations of RC structures reinforced with FRP. Composites are treated using the serial/parallel mixing theory, which deduces the composite behavior from the constitutive equations of its components. A new construction-stages algorithm is developed for simulating retrofitted structures. The performance of the proposed formulation is proved comparing numerical and experimental results. Finally, the developed code is used to obtain the optimum FRP reinforcement configuration for a RC frame structure.
Abstract
The use of fiber reinforced polymers (FRP) to reinforce and retrofit reinforced concrete (RC) structures has become one of the main applications of composites in civil engineering. [...]
- 7
- read
Plastic–damage seismic model for reinforced concrete frames
J. Faleiro, S. Oller, A. Barbat

Computers and Structures (2008). 86, 581–597

Abstract
A plastic–damage model for reinforced concrete frames is developed in this article, based on the classical plastic model and the continuum damage model. The plastic–damage constitutive law is implemented into a beam model for framed structures, in which these are described by elastic beams and columns with two inelastic hinges at their ends. A numerical procedure for predicting the member and global damage in framed structures using the matrix analysis is developed. Additionally, the article introduces a damage index useful in evaluating the state of structural members and a meaningful global damage index for whole structure. The plastic–damage model, together with the member and global damage indices, are adequate for the computation of the limit load of reinforced concrete frames subjected to seismic actions. Examples of applications of the methodology to the non-linear analysis of reinforced concrete framed structures are finally given.
Abstract
A plastic–damage model for reinforced concrete frames is developed in this article, based on the classical plastic model and the continuum damage model. The plastic–damage [...]
- 8
- read
EFFECTIVENESS OF BLOCK ITERATIVE SCHEMES IN COMPUTING THE SEISMIC RESPONSE OF BUILDINGS WITH NONLINEAR BASE ISOLATION
A. Barbat, N. Molinares, R. Codina

Computers and Structures (1996). 58(1), 133-141

Abstract
The conventional form of solving the equations of motion governing the seismic response of building structures with nonlinear base isolation consists of using monolithic step by step integrationmethods. As an alternative, the application of a block iterative scheme is examined in this paper. After describing the particularities of the equations of motion of the structure with base isolation, different block iterative schemes are described. Their effectiveness is discussed and compared with that of monolithic step by step integration methods. Adequate examples are used with the aim of performing numerical comparisons.
Abstract
The conventional form of solving the equations of motion governing the seismic response of building structures with nonlinear base isolation consists of using monolithic step [...]
- 7
- read
Parameter identification of large-scale magnetorheological dampers in a benchmark building
A. Bahar, F. Pozo, L. Acho, J. Rodellar, A. Barbat

Computers and Structures (2010). 88, 198–206

Abstract
Magnetorheological (MR) dampers are devices that can be used for vibration reduction in structures. However, to use these devices in an effective way, a precise modeling is required. In this sense, in this paper we consider a modified parameter identification method of large-scale magnetorheological dampers which are represented using the normalized Bouc–Wen model. The main benefit of the proposed identification algorithm is the accuracy of the parameter estimation. The validation of the parameter identification method has been carried out using a black box model of an MR damper in a smart base-isolated benchmark building. Magnetorheological dampers are used in this numerical platform both as isolation bearings as well as semi-active control devices.
Abstract
Magnetorheological (MR) dampers are devices that can be used for vibration reduction in structures. However, to use these devices in an effective way, a precise modeling is [...]
- 14
- read
Hierarchical semi-active control of base-isolated structures using a new inverse model of magnetorheological dampers
A. Bahar, F. Pozo, L. Acho, J. Rodellar, A. Barbat

Computers and Structures (2010). 88, 483–496

Abstract
Magnetorheological (MR) dampers have received special attention as semi-active devices for mitigation of structural vibrations. Because of the inherent nonlinearity of these devices, it is difficult to obtain a reasonable mathematical inverse model. This paper is concerned with two related concepts. On one hand, it presents a new inverse model of MR dampers based on the normalized Bouc–Wen model. On the other hand, it considers a hybrid seismic control system for building structures, which combines a class of passive nonlinear base isolator with a semi-active control system. In this application, the MR damper is used as a semi-active device in which the voltage is updated by a feedback control loop. The management of MR dampers is performed in a hierarchical way according to the desired control force, the actual force of the dampers and its capacity to react. The control is applied to a numerical three-dimensional benchmark problem which is used by the structural control community as a state-of-the-art model for numerical experiments of seismic control attenuation. The performance indices show that the proposed semi-active controller behaves satisfactorily.
Abstract
Magnetorheological (MR) dampers have received special attention as semi-active devices for mitigation of structural vibrations. Because of the inherent nonlinearity of these [...]
- 7
- read

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

information

Submit your paper

Become a journal editor

Create a new collection

Create an organization profile

Open access

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

Prioritizing interventions to reduce seismic vulnerability in school facilities in Colombia

Computational Tool for Post-Earthquake Evaluation of Damage in Buildings

Damage scenarios simulation for seismic risk assessment in urban zones

Revealing the socioeconomic impact of small disasters in Colombia using the DesInventar database

Disaster risk from a macroeconomic perspective: a metric for fiscal vulnerability evaluation

A numerical procedure simulating RC structures reinforced with FRP using the serial/parallel mixing theory

Plastic–damage seismic model for reinforced concrete frames

EFFECTIVENESS OF BLOCK ITERATIVE SCHEMES IN COMPUTING THE SEISMIC RESPONSE OF BUILDINGS WITH NONLINEAR BASE ISOLATION

Parameter identification of large-scale magnetorheological dampers in a benchmark building

Hierarchical semi-active control of base-isolated structures using a new inverse model of magnetorheological dampers

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

information

Sign up at Scipedia and complete your profile

Click on "CREATE A DOCUMENT" in your profile page

Upload your manuscript in LaTeX or Word, or create it from scratch with our online editor

Click on "SUBMIT FOR PUBLICATION" at the manuscript page, and select your preferred journal or collection

Click on "SUBMIT FOR PUBLICATION" at the manuscript page, select your preferred collection and complete the submission form

The editorial board will ensure that the publishing requirements are adhered to, before your paper is published

Colleagues

Followers

Lakhani, Bhavinbhai 489

Quezon, Emer T. 12372

Narvaez, Alejandro 19

Jurado Granados, Joel 171

contributions

external references