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<p>Assessing the seismic response of reinforced concrete structures for fragility analysis is a multifaceted endeavour, as it depends upon the interaction between the behavior of the superstructure, the type of foundation utilized, and the characteristics of the underlying soil strata. This study focuses on developing Incremental Dynamic Analysis Curves specific to building vulnerability assessment by integrating various damage measures incorporating soil-structure interaction effects. Using finite element analysis software, Incremental Dynamic Analysis (IDA) was performed on three-dimensional RC building models with aspect ratio in the range of 1.1 to 4.4 considering both fixed and flexible bases founded on varying soil conditions. The 3D building models were generated with detailed finite element modelling of all reinforcements in beams, columns and slabs to represent the real field conditions. IDA curves were developed using three engineering demand parameters: maximum roof displacement, inter-storey drift, and seldom considered plastic energy dissipation. Findings reveal that maximum roof displacement and inter storey drift parameters for flexible base models under seismic excitations having a peak ground acceleration (PGA) of 0.2&#xa0;g showed a maximum increase of 35% when compared to fixed base condition and this increase diminishes as the PGA surpasses 0.6&#xa0;g. The results show that SSI amplifies seismic response up to 0.6&#xa0;g PGA, emphasizing the need to consider both global and local damage measures for ensuring safety, serviceability, and stability in seismic design. In flexible base models, plastic energy dissipation within the superstructure decreased significantly by 75% in the four-storey and 84% in the sixteen-storey models due to the foundation and surrounding soil absorbing seismic energy, reducing plastic hinge formation and structural damage. Both roof displacement and inter-storey drift are effective damage measures—offering global and localized insights respectively—while plastic energy dissipation, though less effective under SSI conditions, remains a valuable indicator for identifying localized failures and estimating the PGA at which the elastic limit is exceeded in fixed-base models.</p>

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Effect of Soil Strata on Selection of Damage Measure for Vulnerability Assessment of RC Buildings

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Merin Mathews,
  • B. R. Jayalekshmi,
  • Katta Venkataramana

摘要

Assessing the seismic response of reinforced concrete structures for fragility analysis is a multifaceted endeavour, as it depends upon the interaction between the behavior of the superstructure, the type of foundation utilized, and the characteristics of the underlying soil strata. This study focuses on developing Incremental Dynamic Analysis Curves specific to building vulnerability assessment by integrating various damage measures incorporating soil-structure interaction effects. Using finite element analysis software, Incremental Dynamic Analysis (IDA) was performed on three-dimensional RC building models with aspect ratio in the range of 1.1 to 4.4 considering both fixed and flexible bases founded on varying soil conditions. The 3D building models were generated with detailed finite element modelling of all reinforcements in beams, columns and slabs to represent the real field conditions. IDA curves were developed using three engineering demand parameters: maximum roof displacement, inter-storey drift, and seldom considered plastic energy dissipation. Findings reveal that maximum roof displacement and inter storey drift parameters for flexible base models under seismic excitations having a peak ground acceleration (PGA) of 0.2 g showed a maximum increase of 35% when compared to fixed base condition and this increase diminishes as the PGA surpasses 0.6 g. The results show that SSI amplifies seismic response up to 0.6 g PGA, emphasizing the need to consider both global and local damage measures for ensuring safety, serviceability, and stability in seismic design. In flexible base models, plastic energy dissipation within the superstructure decreased significantly by 75% in the four-storey and 84% in the sixteen-storey models due to the foundation and surrounding soil absorbing seismic energy, reducing plastic hinge formation and structural damage. Both roof displacement and inter-storey drift are effective damage measures—offering global and localized insights respectively—while plastic energy dissipation, though less effective under SSI conditions, remains a valuable indicator for identifying localized failures and estimating the PGA at which the elastic limit is exceeded in fixed-base models.