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<p>This study examines the effects of Soil-Structure Interaction (SSI) on frame buildings of varying heights (G + 1, G + 4, and G + 9) constructed over seven different layered soil deposits, each with soft soil deposit layers positioned at varying depths. The analysis was conducted using Nonlinear Time History Analysis (NTHA) with two seismic scenarios: the Loma Prieta earthquake (1989) as a near-field event and the Denali earthquake (2002) as a far-field event. Key parameters, such as horizontal displacements, percentage drifts across floors, and fragility curves, were evaluated for each building type. Additionally, Reliability Indices (RI) were derived from these fragility curves for different soil-structure combinations. Results highlight that soft soil deposit layers near the surface intensify seismic responses, increasing the vulnerability of taller buildings. G + 9 buildings showed the highest probability of exceeding damage limits, while G + 1 structures were the least vulnerable under identical soil deposit and seismic conditions. Near-field earthquakes presented a higher risk of exceeding limit states compared to far-field events. Across all soil deposit profiles and seismic conditions, low-rise buildings consistently demonstrated lower probabilities of structural failure than taller counterparts. The study further revealed that deeper soft soil deposit layers reduce surface displacements, likely due to greater impedance contrasts between soil deposit layers. In summary, the research underscores that buildings are more susceptible to damage during near-field earthquakes, with high-rise structures being particularly vulnerable.</p>

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Reliability and fragility analysis of multi-story buildings on layered soil deposits under near and far-field earthquakes: a soil structure interaction study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月23日

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  • Amit Shiuly,
  • Debapriya Das,
  • Sukalyan Sarkar,
  • Santosh Kumar Das,
  • Narayan Roy

摘要

This study examines the effects of Soil-Structure Interaction (SSI) on frame buildings of varying heights (G + 1, G + 4, and G + 9) constructed over seven different layered soil deposits, each with soft soil deposit layers positioned at varying depths. The analysis was conducted using Nonlinear Time History Analysis (NTHA) with two seismic scenarios: the Loma Prieta earthquake (1989) as a near-field event and the Denali earthquake (2002) as a far-field event. Key parameters, such as horizontal displacements, percentage drifts across floors, and fragility curves, were evaluated for each building type. Additionally, Reliability Indices (RI) were derived from these fragility curves for different soil-structure combinations. Results highlight that soft soil deposit layers near the surface intensify seismic responses, increasing the vulnerability of taller buildings. G + 9 buildings showed the highest probability of exceeding damage limits, while G + 1 structures were the least vulnerable under identical soil deposit and seismic conditions. Near-field earthquakes presented a higher risk of exceeding limit states compared to far-field events. Across all soil deposit profiles and seismic conditions, low-rise buildings consistently demonstrated lower probabilities of structural failure than taller counterparts. The study further revealed that deeper soft soil deposit layers reduce surface displacements, likely due to greater impedance contrasts between soil deposit layers. In summary, the research underscores that buildings are more susceptible to damage during near-field earthquakes, with high-rise structures being particularly vulnerable.