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This study investigates the application of direct displacement-based design (DDBD), a methodology rooted in performance-based design, within predefined response limits. This study focuses on two 15-storey reinforced concrete (RC) moment-resisting frames, one with a fixed base and the other considering soil–structure interaction (SSI) on a pile-raft foundation. The frames are designed using the direct displacement-based design (DDBD) approach and are subjected to Indian Standard IS 1893 (Part-1), 2016 design response spectra for Zone-V. The analysis employs a structure-on-spring approach for RC frames, considering soil stiffness and nonlinearity alongside fibre modelling for frame nonlinearity. A displacement profile is generated based on life safety (LS) performance limits as per (FEMA 356 in Prestandard and commentary for the seismic rehabilitation of building. Federal Emergency Management Agency, Washington (DC), 2000). Nonlinear time history analysis is conducted using incremental dynamic analysis (IDA), subjecting the models to 20 earthquake ground motions to capture the seismic demands of soil–structure systems. Results from the fixed base and SSI cases are compared, focusing on inter-storey drift ratios, base shear, and displacements, providing valuable insights into the seismic performance of structures with and without SSI considerations. The DDBD approach proves effective for RC frame design, particularly when considering SSI effects, showcasing enhanced structural flexibility under seismic loading with less probability of collapse.

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Nonlinear Behaviour of Direct Displacement-Based Designed RC Frame Considering SSI Effect

  • 会议论文

  • 发表日期：

    2025年

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  • Twinsy N. Palsanawala,
  • Chaitra Devaraddi,
  • Sandip A. Vasanwala

摘要

This study investigates the application of direct displacement-based design (DDBD), a methodology rooted in performance-based design, within predefined response limits. This study focuses on two 15-storey reinforced concrete (RC) moment-resisting frames, one with a fixed base and the other considering soil–structure interaction (SSI) on a pile-raft foundation. The frames are designed using the direct displacement-based design (DDBD) approach and are subjected to Indian Standard IS 1893 (Part-1), 2016 design response spectra for Zone-V. The analysis employs a structure-on-spring approach for RC frames, considering soil stiffness and nonlinearity alongside fibre modelling for frame nonlinearity. A displacement profile is generated based on life safety (LS) performance limits as per (FEMA 356 in Prestandard and commentary for the seismic rehabilitation of building. Federal Emergency Management Agency, Washington (DC), 2000). Nonlinear time history analysis is conducted using incremental dynamic analysis (IDA), subjecting the models to 20 earthquake ground motions to capture the seismic demands of soil–structure systems. Results from the fixed base and SSI cases are compared, focusing on inter-storey drift ratios, base shear, and displacements, providing valuable insights into the seismic performance of structures with and without SSI considerations. The DDBD approach proves effective for RC frame design, particularly when considering SSI effects, showcasing enhanced structural flexibility under seismic loading with less probability of collapse.