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<p>This paper presents a comparison and quantification of seismic responses in typical low-rise steel and reinforced concrete buildings standing on the soft soil of Langol (high seismic zone), considering both rigid-base and realistic soil-base conditions. The foundation design incorporates local geotechnical parameters with settlement corrections, and inelastic time history analysis is performed on building models using tested data of Langol’s multilayered soil profile. Results show that Soil-Structure Interaction (SSI) significantly increases inter-storey drifts particularly in steel buildings, while Reinforced Cement Concrete (RCC) buildings exhibit better seismic resistance. Under Nonlinear Time History Analysis (NLTHA), steel buildings display considerably higher ISDRs than RCC buildings, and these effects intensify when SSI is included reflecting the flexible behaviour of steel under dynamic conditions. Fragility analysis are conducted for five performance levels; Operational (OP), Immediate Occupancy (IO), Damage Control (DC), Life Safety (LS), and Collapse Prevention (CP). RCC buildings sustain higher PGA thresholds for each damage state compared to steel buildings. When SSI is considered, both RCC and steel buildings become more vulnerable to earthquakes. The Peak Ground Acceleration (PGA) needed to reach each damage level decreases by about 10 to15% for RCC and 30 to 40% for steel buildings, meaning the likelihood of damage increases to around 25 to 44% for RCC and 35 to 47% for steel structures. The results emphasize the importance of incorporating realistic soil-base conditions in seismic design and highlight the superior seismic performance of RCC buildings over steel buildings founded on similar geotechnical conditions.</p>

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Seismic fragility assessment of low rise RCC and steel frame buildings founded on soft soil of Langol, Manipur

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Sunil Singh Mayengbam,
  • Nisha Maibam

摘要

This paper presents a comparison and quantification of seismic responses in typical low-rise steel and reinforced concrete buildings standing on the soft soil of Langol (high seismic zone), considering both rigid-base and realistic soil-base conditions. The foundation design incorporates local geotechnical parameters with settlement corrections, and inelastic time history analysis is performed on building models using tested data of Langol’s multilayered soil profile. Results show that Soil-Structure Interaction (SSI) significantly increases inter-storey drifts particularly in steel buildings, while Reinforced Cement Concrete (RCC) buildings exhibit better seismic resistance. Under Nonlinear Time History Analysis (NLTHA), steel buildings display considerably higher ISDRs than RCC buildings, and these effects intensify when SSI is included reflecting the flexible behaviour of steel under dynamic conditions. Fragility analysis are conducted for five performance levels; Operational (OP), Immediate Occupancy (IO), Damage Control (DC), Life Safety (LS), and Collapse Prevention (CP). RCC buildings sustain higher PGA thresholds for each damage state compared to steel buildings. When SSI is considered, both RCC and steel buildings become more vulnerable to earthquakes. The Peak Ground Acceleration (PGA) needed to reach each damage level decreases by about 10 to15% for RCC and 30 to 40% for steel buildings, meaning the likelihood of damage increases to around 25 to 44% for RCC and 35 to 47% for steel structures. The results emphasize the importance of incorporating realistic soil-base conditions in seismic design and highlight the superior seismic performance of RCC buildings over steel buildings founded on similar geotechnical conditions.