New code site classification, amplification factors and normalized response spectra based on a worldwide ground-motion database

Pitilakis, Kyriazis; Riga, Evi; Anastasiadis, Anastasios

doi:10.1007/s10518-013-9429-4

Cited by 152 publications

(105 citation statements)

References 34 publications

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“…In order to further improve design spectra and soil factors Pitilakis et al (2013) proposed a new soil classification system that includes soil type, stratigraphy, thickness, stiffness and fundamental period of soil deposit (T 0 ) and average shear wave velocity of the entire soil deposit (V s,av ). They compiled an important subset of the SHARE database, containing records from sites, which dispose a welldocumented soil profile concerning dynamic properties and depth up to the "seismic" bedrock (V s > 800 m/s).…”

Section: Site Effectsmentioning

confidence: 99%

“…If it ever happens, it will have a profound political, societal and economic impact. Pitilakis et al (2013) …”

Section: Time Dependent Risk Assessmentmentioning

confidence: 99%

“…Soil conditions are very well known (e.g., Anastasiadis et al 2001). Figures 3.12 and 3.13 illustrate the classification of the study area based on the classification schemes of EC8 and Pitilakis et al (2013) respectively. The probabilistic seismic hazard (PSHA) is estimated applying SHARE methodology (Giardini et al 2013), with its rigorous treatment of aleatory and epistemic uncertainties.…”

Section: Background Information and Datamentioning

confidence: 99%

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Earthquake Risk Assessment: Certitudes, Fallacies, Uncertainties and the Quest for Soundness

Pitilakis

2015

Perspectives on European Earthquake Engineering and Seismology

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This paper addresses, from engineering point of view, issues in seismic risk assessment. It is more a discussion on the current practice, emphasizing on the multiple uncertainties and weaknesses of the existing methods and approaches, which make the final loss assessment a highly ambiguous problem. The paper is a modest effort to demonstrate that, despite the important progress made the last two decades or so, the common formulation of hazard/risk based on the sequential analyses of source (M, hypocenter), propagation (for one or few IM) and consequences (losses) has probably reached its limits. It contains so many uncertainties affecting seriously the final result, and the way that different communities involved, modellers and end users are approaching the problem is so scattered, that the seismological and engineering community should probably re-think a new or an alternative paradigm. IntroductionSeismic hazard and risk assessments are nowadays rather established sciences, in particular in the probabilistic formulation of hazard. Long-term hazard/risk assessments are the base for the definition of long-term actions for risk mitigation. However, several recent events raised questions about the reliability of such methods. The occurrence of relatively "unexpected" levels of hazard and loss (e.g., Emilia, Christchurch, Tohoku) and the continuous increase of hazard with time, basically due to the increase of seismic data, and the increase of exposure, make loss assessment a highly ambiguous problem.Existing models present important discrepancies. Sometimes such discrepancies are only apparent, since we do not always compare two "compatible" values. There

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Section: Site Effectsmentioning

confidence: 99%

“…If it ever happens, it will have a profound political, societal and economic impact. Pitilakis et al (2013) …”

Section: Time Dependent Risk Assessmentmentioning

confidence: 99%

Section: Background Information and Datamentioning

confidence: 99%

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Earthquake Risk Assessment: Certitudes, Fallacies, Uncertainties and the Quest for Soundness

Pitilakis

2015

Perspectives on European Earthquake Engineering and Seismology

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“…Com o objetivo de mitigar os danos provocados pela liquefação, a engenharia civil e, mais especificamente, a geotecnia tem procurado estudar este processo físico, principalmente nas proximidades de zonas povoadas e/ou de serviços que garantem a resiliência das comunidades nas zonas afetadas, como hospitais, quartéis de bombeiros e outros edifícios de serviços públicos. Para o estudo da resiliência das zonas afetadas pelos sismos é fundamental ter uma especial atenção às lifelines (estruturas e infraestruturas de apoio às populações, desde estradas a redes de abastecimento de água, esgotos, eletricidade, gás, comunicações), devido, segundo Pitilakis et al (2013), a três importantes características: (a) grande variabilidade a nível espacial, topológico e de exposição a diferentes tipos de perigos geológicos e geotécnicos; (b) grande variabilidade de tipologia e materiais usados; e (c) especificidade das funções requeridas. É ainda de destacar que a sua reparação, na maioria dos casos, tem um custo de 10% ou 15% do seu custo de construção.…”

Section: -Introduçãounclassified

Microzonamento de suscetibilidade à liquefação: caso de estudo no Vale Inferior do Tejo

Saldanha¹,

Fonseca²,

Ferreira³

et al. 2018

geotecnia

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Este trabalho enquadra-se no projeto europeu de investigação LIQUEFACT, do qual a Faculdade de Engenharia da Universidade do Porto é parceira e associada. Durante a realização deste trabalho, foi recolhida uma vasta informação geológico-geotécnica existente, de modo a constituir uma base de dados sólida para a escolha de um sítio-piloto, para realização de ensaios in situ complementares, com vista à elaboração de um microzonamento de suscetibilidade à liquefação. A análise dessa informação geotécnica (sobretudo SPT, CPT e CH) incluiu a avaliação de índices de risco de liquefação, nomeadamente o Fator de Segurança à liquefação (FSliq), Índice Potencial de Liquefação (LPI) e Número de Severidade de Liquefação (LSN), tendose escolhido um sítio piloto na zona da Lezíria Grande de Vila Franca de Xira. A campanha experimental envolveu ensaios SPT, CPTu, SDMT, diversos métodos geofísicos e ainda a recolha de amostras de alta qualidade para caracterização laboratorial. O tratamento dos resultados destes ensaios foi subdividido em três tipos de análises, em termos de Índices de Risco, da classificação de acordo com VS30, e ainda baseada nos assentamentos e deslocamentos laterais esperados. Destas análises, foi possível estabelecer e propor um microzonamento preliminar de suscetibilidade à liquefação induzida por sismos.

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“…The main International Technical Codes, such as Eurocode 8 [3], ASCE/SEI 7-10 [4], FEMA regulations [5], as well as the Italian one [6], provide a seismic input defined after a soil classification based on the uppermost 30 m shear-wave velocity (v s,30 ) of the site. The evaluation of v s,30 , therefore, plays an important role in the seismic assessment of buildings, even if additional parameters [7], would help achieving a more refined description.…”

Section: Introductionmentioning

confidence: 99%

Aleatory Variability and Site Effects: The Problem of Soil Classification

Viti¹,

Tanganelli²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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New code site classification, amplification factors and normalized response spectra based on a worldwide ground-motion database

Cited by 152 publications

References 34 publications

Earthquake Risk Assessment: Certitudes, Fallacies, Uncertainties and the Quest for Soundness

Earthquake Risk Assessment: Certitudes, Fallacies, Uncertainties and the Quest for Soundness

Microzonamento de suscetibilidade à liquefação: caso de estudo no Vale Inferior do Tejo

Aleatory Variability and Site Effects: The Problem of Soil Classification

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