The Experts below are selected from a list of 16806 Experts worldwide ranked by ideXlab platform
Humberto Varum - One of the best experts on this subject based on the ideXlab platform.
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Seismic Vulnerability of vernacular buildings in urban centres the case of vila real de santo antonio
Seismic Retrofitting: Learning from Vernacular Architecture - Vernacular Seismic Culture in Portugal Research Project Funded under the National Resear, 2015Co-Authors: Javier Ortega Heras, Paulo B Lourenco, Graca Vasconcelos, Hugo Rodrigues, Humberto VarumAbstract:Following detailed studies of Portuguese vernacular building typologies, this paper deals with buildings located in historical urban centres. An analysis of the history of the urban centre and, in particular, of some vernacular buildings is enhanced. Additionally, a discussion on the influence of changes of the geometry, and on added built volumes to original buildings in the Seismic Vulnerability of the buildings is also provided.
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Seismic Vulnerability of building aggregates through hybrid and indirect assessment techniques
Bulletin of Earthquake Engineering, 2015Co-Authors: Rui Maio, Antonio Formisano, Romeu Vicente, Humberto VarumAbstract:This work approaches the Seismic Vulnerability assessment of an old stone masonry building aggregate, located in San Pio delle Camere (Abruzzo, Italy), slightly affected by the 2009 April 6th earthquake occurred in L’Aquila and its districts. This building aggregate has been modelled by using the 3muri® software for Seismic analysis of masonry constructions. On one hand, static non-linear numerical analyses were performed to obtain capacity curves together with the prediction of damage distributions for the input Seismic action (hybrid technique). On the other hand, indirect techniques, based on different Vulnerability index formulations, were used for assessing the building aggregate’s behaviour under earthquake action. The activities carried out have provided a clear framework on the Seismic Vulnerability of building aggregates, as well as aid future retrofitting interventions.
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Seismic Vulnerability assessment of historical urban centres case study of the old city centre in seixal portugal
Bulletin of Earthquake Engineering, 2013Co-Authors: Tiago Miguel Ferreira, Humberto Varum, Romeu Vicente, J Mendes A R Silva, Anibal CostaAbstract:The Seismic Vulnerability assessment of old masonry buildings is essential not only to buildings with recognised historical and heritage value but also to ordinary residential masonry buildings. This paper approaches the Seismic Vulnerability assessment of masonry buildings by applying a simplified methodology to the old city centre of Seixal in Portugal. The methodology adopted in this study was based on a Vulnerability index used for the evaluation of damage and the study of loss scenarios on a large scale. Over 500 buildings were assessed using this methodology, and the results were analysed using an integrated Geographical Information System tool. The integration of the Vulnerability and loss results could allow city councils or regional authorities to plan interventions based on a global view of the site under analysis, leading to more accurate and comprehensive risk mitigation strategies that support the requirements of safety and emergency planning.
Zelang Miao - One of the best experts on this subject based on the ideXlab platform.
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an object based image analysis for building Seismic Vulnerability assessment using high resolution remote sensing imagery
Natural Hazards, 2014Co-Authors: Zhiping Cheng, Zelang Miao, Wenzhong ShiAbstract:Building Seismic Vulnerability assessment plays an important role in formulating pre-disaster mitigation strategies for developing countries. The occurrence of high-resolution satellite sensors has greatly motivated it by providing a promising approach to obtain building information. However, this also brings a big challenge to the accurate building extraction and its coherent integration with the assessment model. The main objective of this paper is to investigate how to extract building attributes from high-resolution remote sensing imagery using the object-based image analysis (OBIA) method, so as to accurately and conveniently assess building Seismic Vulnerability by the combination of in situ field data. A general framework for the assessment of building Seismic Vulnerability is presented, including (1) the extraction of building information using OBIA, (2) building height estimation, and (3) the support vector machine (SVM)-based building Seismic Vulnerability assessment. Particularly, an integrated solution is proposed that merges the strengths of multiple spatial contextual relationships and some typical image object measures, under the unified framework to improve building information extraction at different scale levels as well as for different interest objects. With the aid of 35 building samples from two powerful earthquakes in China, the cloud-free WorldView-2 images and some building structure parameters from field survey were used to quantity the grades of building Seismic Vulnerability in Wuhan Optics Valley, China. The results show that all 48 buildings among the study area have been well detected with an overall accuracy of 80.67 % and the mean error of heights estimated from building shadow is less than 2 m. This indicates that the integrated analysis strategy based on OBIA is suitable for extracting the building information from high-resolution remote sensing imagery. Additionally, the assessment results using SVM show that the building Seismic Vulnerability is statistically significantly related to structure types and building heights. Both the proposed OBIA method and its integration strategy with SVM are easily implemented and provide readily interpretable assessment results for building Seismic Vulnerability. This reveals that the proposed method has a great potential to assist urban planners for making local disaster mitigation planning through the prioritization of intervention measures, such as the reinforcement of walls and the dismantlement of endangered houses. Copyright Springer Science+Business Media Dordrecht 2014
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An object-based image analysis for building Seismic Vulnerability assessment using high-resolution remote sensing imagery
Natural Hazards, 2014Co-Authors: Hao Wu, Zelang Miao, Wenzhong Shi, Zhiping Cheng, Chenchen XuAbstract:Building Seismic Vulnerability assessment plays an important role in formulating pre-disaster mitigation strategies for developing countries. The occurrence of high-resolution satellite sensors has greatly motivated it by providing a promising approach to obtain building information. However, this also brings a big challenge to the accurate building extraction and its coherent integration with the assessment model. The main objective of this paper is to investigate how to extract building attributes from high-resolution remote sensing imagery using the object-based image analysis (OBIA) method, so as to accurately and conveniently assess building Seismic Vulnerability by the combination of in situ field data. A general framework for the assessment of building Seismic Vulnerability is presented, including (1) the extraction of building information using OBIA, (2) building height estimation, and (3) the support vector machine (SVM)-based building Seismic Vulnerability assessment. Particularly, an integrated solution is proposed that merges the strengths of multiple spatial contextual relationships and some typical image object measures, under the unified framework to improve building information extraction at different scale levels as well as for different interest objects. With the aid of 35 building samples from two powerful earthquakes in China, the cloud-free WorldView-2 images and some building structure parameters from field survey were used to quantity the grades of building Seismic Vulnerability in Wuhan Optics Valley, China. The results show that all 48 buildings among the study area have been well detected with an overall accuracy of 80.67 % and the mean error of heights estimated from building shadow is less than 2 m. This indicates that the integrated analysis strategy based on OBIA is suitable for extracting the building information from high-resolution remote sensing imagery. Additionally, the assessment results using SVM show that the building Seismic Vulnerability is statistically significantly related to structure types and building heights. Both the proposed OBIA method and its integration strategy with SVM are easily implemented and provide readily interpretable assessment results for building Seismic Vulnerability. This reveals that the proposed method has a great potential to assist urban planners for making local disaster mitigation planning through the prioritization of intervention measures, such as the reinforcement of walls and the dismantlement of endangered houses.
Romeu Vicente - One of the best experts on this subject based on the ideXlab platform.
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Seismic Vulnerability assessment of stone masonry facade walls calibration using fragility based results and observed damage
Soil Dynamics and Earthquake Engineering, 2017Co-Authors: Tiago Miguel Ferreira, Rui Maio, Alexandre A Costa, Romeu VicenteAbstract:Abstract This paper is focused on the calibration of a simplified Seismic Vulnerability index method for masonry facade walls, through an innovative two-step calibration process based on two complementary approaches. The first one is based on a set of fragility curves constructed from out-of-plane damage limit states obtained from experimental data, which are used to calibrate the weights associated to the parameters of the Vulnerability index method that rule the out-of-plane response of the masonry facade walls. The second approach, subsequently used to calibrate the weights of the remaining Vulnerability parameters, is based on post-earthquake damage data collected after the Seismic event that struck the Azores Archipelago in July 1998. The results obtained from such calibration are then presented and critically discussed taking into account not only the calibration itself, but also their reliability from the methodological point of view. Finally, the addition of three new evaluation parameters is further proposed and analysed. This two-step calibration process represents a valuable contribution for the current state-of-art of the simplified Seismic Vulnerability assessment methodologies which, up to the present, have been developed and calibrated only on the basis of empirical data.
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Seismic Vulnerability assessment of the old city centre of horta azores calibration and application of a Seismic Vulnerability index method
Bulletin of Earthquake Engineering, 2017Co-Authors: Tiago Miguel Ferreira, Rui Maio, Romeu VicenteAbstract:The Seismic Vulnerability assessment of old masonry buildings is essential not only to buildings with recognised historical and heritage value but also to ordinary residential masonry buildings. Thus, and resorting a wide set of damage data collected after the 1998 Azores earthquake, this paper addresses the topic of the Seismic Vulnerability assessment of traditional masonry buildings through the calibration and application of a simplified Vulnerability assessment method to the old city centre of Horta (Faial Island), in Portugal. In this case study, 192 buildings were assessed using this methodology, and Vulnerability and loss scenarios were analysed using an integrated Geographical Information System tool. As is discussed in this paper, such procedure could allow city councils or regional authorities to plan interventions based on a global view of the site under analysis, leading to more accurate and comprehensive risk mitigation strategies, which can than support the requirements of safety and emergency planning.
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Seismic Vulnerability assessment of historical urban centres case study of the old city centre of faro portugal
Journal of Risk Research, 2016Co-Authors: Rui Maio, Romeu Vicente, Tiago Miguel Ferreira, Joao Manuel Carvalho EstevaoAbstract:The necessity of implementing Seismic Vulnerability assessment procedures to the Portuguese building stock has become urgent as recent predictions indicate the possibility of the occurrence of an earthquake similar to the well-known 1755 Lisbon earthquake within the next 50 years. Obviously, at first instance, large-scale procedures should be used rather than more extensive and accurate methodologies suited for individual buildings assessment. Moreover, it is fundamental to operate in the most vulnerable areas in our built environment, typically, the historical urban centres. As it is recognised, it is within these areas, that old masonry buildings are generally concentrated, being both the most representative and vulnerable constructive typology. Comprising 354 buildings, the case study of the old city centre of Faro is herein presented aiming at analysing and evaluating the Seismic Vulnerability of its old masonry building stock. In order to achieve these objectives, a Vulnerability-index-based methodol...
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Seismic Vulnerability of building aggregates through hybrid and indirect assessment techniques
Bulletin of Earthquake Engineering, 2015Co-Authors: Rui Maio, Antonio Formisano, Romeu Vicente, Humberto VarumAbstract:This work approaches the Seismic Vulnerability assessment of an old stone masonry building aggregate, located in San Pio delle Camere (Abruzzo, Italy), slightly affected by the 2009 April 6th earthquake occurred in L’Aquila and its districts. This building aggregate has been modelled by using the 3muri® software for Seismic analysis of masonry constructions. On one hand, static non-linear numerical analyses were performed to obtain capacity curves together with the prediction of damage distributions for the input Seismic action (hybrid technique). On the other hand, indirect techniques, based on different Vulnerability index formulations, were used for assessing the building aggregate’s behaviour under earthquake action. The activities carried out have provided a clear framework on the Seismic Vulnerability of building aggregates, as well as aid future retrofitting interventions.
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Seismic Vulnerability assessment of historical urban centres case study of the old city centre in seixal portugal
Bulletin of Earthquake Engineering, 2013Co-Authors: Tiago Miguel Ferreira, Humberto Varum, Romeu Vicente, J Mendes A R Silva, Anibal CostaAbstract:The Seismic Vulnerability assessment of old masonry buildings is essential not only to buildings with recognised historical and heritage value but also to ordinary residential masonry buildings. This paper approaches the Seismic Vulnerability assessment of masonry buildings by applying a simplified methodology to the old city centre of Seixal in Portugal. The methodology adopted in this study was based on a Vulnerability index used for the evaluation of damage and the study of loss scenarios on a large scale. Over 500 buildings were assessed using this methodology, and the results were analysed using an integrated Geographical Information System tool. The integration of the Vulnerability and loss results could allow city councils or regional authorities to plan interventions based on a global view of the site under analysis, leading to more accurate and comprehensive risk mitigation strategies that support the requirements of safety and emergency planning.
Tiago Miguel Ferreira - One of the best experts on this subject based on the ideXlab platform.
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Seismic Vulnerability assessment of stone masonry facade walls calibration using fragility based results and observed damage
Soil Dynamics and Earthquake Engineering, 2017Co-Authors: Tiago Miguel Ferreira, Rui Maio, Alexandre A Costa, Romeu VicenteAbstract:Abstract This paper is focused on the calibration of a simplified Seismic Vulnerability index method for masonry facade walls, through an innovative two-step calibration process based on two complementary approaches. The first one is based on a set of fragility curves constructed from out-of-plane damage limit states obtained from experimental data, which are used to calibrate the weights associated to the parameters of the Vulnerability index method that rule the out-of-plane response of the masonry facade walls. The second approach, subsequently used to calibrate the weights of the remaining Vulnerability parameters, is based on post-earthquake damage data collected after the Seismic event that struck the Azores Archipelago in July 1998. The results obtained from such calibration are then presented and critically discussed taking into account not only the calibration itself, but also their reliability from the methodological point of view. Finally, the addition of three new evaluation parameters is further proposed and analysed. This two-step calibration process represents a valuable contribution for the current state-of-art of the simplified Seismic Vulnerability assessment methodologies which, up to the present, have been developed and calibrated only on the basis of empirical data.
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Seismic Vulnerability assessment of the old city centre of horta azores calibration and application of a Seismic Vulnerability index method
Bulletin of Earthquake Engineering, 2017Co-Authors: Tiago Miguel Ferreira, Rui Maio, Romeu VicenteAbstract:The Seismic Vulnerability assessment of old masonry buildings is essential not only to buildings with recognised historical and heritage value but also to ordinary residential masonry buildings. Thus, and resorting a wide set of damage data collected after the 1998 Azores earthquake, this paper addresses the topic of the Seismic Vulnerability assessment of traditional masonry buildings through the calibration and application of a simplified Vulnerability assessment method to the old city centre of Horta (Faial Island), in Portugal. In this case study, 192 buildings were assessed using this methodology, and Vulnerability and loss scenarios were analysed using an integrated Geographical Information System tool. As is discussed in this paper, such procedure could allow city councils or regional authorities to plan interventions based on a global view of the site under analysis, leading to more accurate and comprehensive risk mitigation strategies, which can than support the requirements of safety and emergency planning.
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Seismic Vulnerability assessment of historical urban centres case study of the old city centre of faro portugal
Journal of Risk Research, 2016Co-Authors: Rui Maio, Romeu Vicente, Tiago Miguel Ferreira, Joao Manuel Carvalho EstevaoAbstract:The necessity of implementing Seismic Vulnerability assessment procedures to the Portuguese building stock has become urgent as recent predictions indicate the possibility of the occurrence of an earthquake similar to the well-known 1755 Lisbon earthquake within the next 50 years. Obviously, at first instance, large-scale procedures should be used rather than more extensive and accurate methodologies suited for individual buildings assessment. Moreover, it is fundamental to operate in the most vulnerable areas in our built environment, typically, the historical urban centres. As it is recognised, it is within these areas, that old masonry buildings are generally concentrated, being both the most representative and vulnerable constructive typology. Comprising 354 buildings, the case study of the old city centre of Faro is herein presented aiming at analysing and evaluating the Seismic Vulnerability of its old masonry building stock. In order to achieve these objectives, a Vulnerability-index-based methodol...
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Seismic Vulnerability assessment of historical urban centres case study of the old city centre in seixal portugal
Bulletin of Earthquake Engineering, 2013Co-Authors: Tiago Miguel Ferreira, Humberto Varum, Romeu Vicente, J Mendes A R Silva, Anibal CostaAbstract:The Seismic Vulnerability assessment of old masonry buildings is essential not only to buildings with recognised historical and heritage value but also to ordinary residential masonry buildings. This paper approaches the Seismic Vulnerability assessment of masonry buildings by applying a simplified methodology to the old city centre of Seixal in Portugal. The methodology adopted in this study was based on a Vulnerability index used for the evaluation of damage and the study of loss scenarios on a large scale. Over 500 buildings were assessed using this methodology, and the results were analysed using an integrated Geographical Information System tool. The integration of the Vulnerability and loss results could allow city councils or regional authorities to plan interventions based on a global view of the site under analysis, leading to more accurate and comprehensive risk mitigation strategies that support the requirements of safety and emergency planning.
Rui Maio - One of the best experts on this subject based on the ideXlab platform.
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Seismic Vulnerability assessment of stone masonry facade walls calibration using fragility based results and observed damage
Soil Dynamics and Earthquake Engineering, 2017Co-Authors: Tiago Miguel Ferreira, Rui Maio, Alexandre A Costa, Romeu VicenteAbstract:Abstract This paper is focused on the calibration of a simplified Seismic Vulnerability index method for masonry facade walls, through an innovative two-step calibration process based on two complementary approaches. The first one is based on a set of fragility curves constructed from out-of-plane damage limit states obtained from experimental data, which are used to calibrate the weights associated to the parameters of the Vulnerability index method that rule the out-of-plane response of the masonry facade walls. The second approach, subsequently used to calibrate the weights of the remaining Vulnerability parameters, is based on post-earthquake damage data collected after the Seismic event that struck the Azores Archipelago in July 1998. The results obtained from such calibration are then presented and critically discussed taking into account not only the calibration itself, but also their reliability from the methodological point of view. Finally, the addition of three new evaluation parameters is further proposed and analysed. This two-step calibration process represents a valuable contribution for the current state-of-art of the simplified Seismic Vulnerability assessment methodologies which, up to the present, have been developed and calibrated only on the basis of empirical data.
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Seismic Vulnerability assessment of the old city centre of horta azores calibration and application of a Seismic Vulnerability index method
Bulletin of Earthquake Engineering, 2017Co-Authors: Tiago Miguel Ferreira, Rui Maio, Romeu VicenteAbstract:The Seismic Vulnerability assessment of old masonry buildings is essential not only to buildings with recognised historical and heritage value but also to ordinary residential masonry buildings. Thus, and resorting a wide set of damage data collected after the 1998 Azores earthquake, this paper addresses the topic of the Seismic Vulnerability assessment of traditional masonry buildings through the calibration and application of a simplified Vulnerability assessment method to the old city centre of Horta (Faial Island), in Portugal. In this case study, 192 buildings were assessed using this methodology, and Vulnerability and loss scenarios were analysed using an integrated Geographical Information System tool. As is discussed in this paper, such procedure could allow city councils or regional authorities to plan interventions based on a global view of the site under analysis, leading to more accurate and comprehensive risk mitigation strategies, which can than support the requirements of safety and emergency planning.
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Seismic Vulnerability assessment of historical urban centres case study of the old city centre of faro portugal
Journal of Risk Research, 2016Co-Authors: Rui Maio, Romeu Vicente, Tiago Miguel Ferreira, Joao Manuel Carvalho EstevaoAbstract:The necessity of implementing Seismic Vulnerability assessment procedures to the Portuguese building stock has become urgent as recent predictions indicate the possibility of the occurrence of an earthquake similar to the well-known 1755 Lisbon earthquake within the next 50 years. Obviously, at first instance, large-scale procedures should be used rather than more extensive and accurate methodologies suited for individual buildings assessment. Moreover, it is fundamental to operate in the most vulnerable areas in our built environment, typically, the historical urban centres. As it is recognised, it is within these areas, that old masonry buildings are generally concentrated, being both the most representative and vulnerable constructive typology. Comprising 354 buildings, the case study of the old city centre of Faro is herein presented aiming at analysing and evaluating the Seismic Vulnerability of its old masonry building stock. In order to achieve these objectives, a Vulnerability-index-based methodol...
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Seismic Vulnerability of building aggregates through hybrid and indirect assessment techniques
Bulletin of Earthquake Engineering, 2015Co-Authors: Rui Maio, Antonio Formisano, Romeu Vicente, Humberto VarumAbstract:This work approaches the Seismic Vulnerability assessment of an old stone masonry building aggregate, located in San Pio delle Camere (Abruzzo, Italy), slightly affected by the 2009 April 6th earthquake occurred in L’Aquila and its districts. This building aggregate has been modelled by using the 3muri® software for Seismic analysis of masonry constructions. On one hand, static non-linear numerical analyses were performed to obtain capacity curves together with the prediction of damage distributions for the input Seismic action (hybrid technique). On the other hand, indirect techniques, based on different Vulnerability index formulations, were used for assessing the building aggregate’s behaviour under earthquake action. The activities carried out have provided a clear framework on the Seismic Vulnerability of building aggregates, as well as aid future retrofitting interventions.