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<p>Algeria has experienced several seismic events, particularly in the northern part of the country. Historical and cultural heritage cities especially are facing increasing risks due to population growth, urbanization and public awareness. A method for assessing seismic risk mitigation priorities for building structures on a city or regional scale is needed. For this purpose, a proposed Scenario-based seismic damage prediction code named PBESP (proposed Blida earthquake scenario program) is built, using vulnerability curves drawn up for Algerian structural context, as a function of building vulnerability index and macroseismic intensity. In-field Building inventory data base is carried out and integrated in GIS (geographic information system) tool, considering structural parameters of 370 buildings in Blida city. PBESP and RADIUS methodologies (risk assessment tools for the diagnosis of urban areas against seismic disasters) are compiled assuming the Blida fault, to assess potential damage. The resulting seismic risk maps from the two methods, illustrating the spatial damage distribution reveal the high level of Blida city vulnerability, mainly regarding the old masonry structures that make up the city’s heritage. According to the damage rates estimated in previous studies (~ 40%), as well as by RADIUS tool (~ 40%) applied in this work, a significant underestimation is observed compared to those assessed by PBESP (~ 78%) for the considered Blida earthquake scenario, hence the need to involve vulnerability curves of the local context.</p>

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Revisiting seismic scenario based on damage curves of Algerian structures implemented in Blida city

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月30日

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  • Khalida Tadjer,
  • Mahmoud Bensaibi,
  • Nassima Benkaci,
  • Khadidja Abbes,
  • Samira Saadi,
  • Abdelkader Chaid

摘要

Algeria has experienced several seismic events, particularly in the northern part of the country. Historical and cultural heritage cities especially are facing increasing risks due to population growth, urbanization and public awareness. A method for assessing seismic risk mitigation priorities for building structures on a city or regional scale is needed. For this purpose, a proposed Scenario-based seismic damage prediction code named PBESP (proposed Blida earthquake scenario program) is built, using vulnerability curves drawn up for Algerian structural context, as a function of building vulnerability index and macroseismic intensity. In-field Building inventory data base is carried out and integrated in GIS (geographic information system) tool, considering structural parameters of 370 buildings in Blida city. PBESP and RADIUS methodologies (risk assessment tools for the diagnosis of urban areas against seismic disasters) are compiled assuming the Blida fault, to assess potential damage. The resulting seismic risk maps from the two methods, illustrating the spatial damage distribution reveal the high level of Blida city vulnerability, mainly regarding the old masonry structures that make up the city’s heritage. According to the damage rates estimated in previous studies (~ 40%), as well as by RADIUS tool (~ 40%) applied in this work, a significant underestimation is observed compared to those assessed by PBESP (~ 78%) for the considered Blida earthquake scenario, hence the need to involve vulnerability curves of the local context.