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Past seismic events have shown that high-rise Reinforced Concrete Moment Resisting Frames (RC-MRFs) designed according to current building codes often experience significant inelastic deformations. Predicting and controlling these deformations has proven challenging, as there is no precise method available. This study aims to introduce a performance-based plastic design (PBPD) approach for analyzing and designing high-rise RC-MRF frames while accounting for the inelastic behavior of the structure. In this study, a 24-story RC-MRF frame is selected for analysis and design, utilizing both the force-based design (FBD) method and the PBPD method for seismic loads. The PBPD approach considers three performance levels: immediate occupancy (IO), life safety (LS), and collapse prevention (CP). Indian standard code guidelines and principles are applied in the analysis and design of the frame. The performance assessment of the frame is conducted through nonlinear static pushover analysis. The results obtained indicate that the PBPD-LS frame outperforms the other frames. It is noteworthy that design sections in the PBPD-LS frame are found to be the most efficient, and the displacements remain within defined limits. On the other hand, the PBPD-IO frame is found to be highly uneconomical among the frames. Additionally, secondary moment effects (P-delta) appear to dominate in the PBPD-CP frame. Based on these observations, it can be concluded that, among all the frames, the PBPD-LS frame meets the desired PBPD outcomes and performs exceptionally well within the specified limits.

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Strength and Deformation Assessment of a Tall RC-MRF Designed by Force-Based Design Method and Performance-Based Plastic Design Method

  • 会议论文

  • 发表日期：

    2025年

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  • Rohit Vyas,
  • Anoop I. Shirkol

摘要

Past seismic events have shown that high-rise Reinforced Concrete Moment Resisting Frames (RC-MRFs) designed according to current building codes often experience significant inelastic deformations. Predicting and controlling these deformations has proven challenging, as there is no precise method available. This study aims to introduce a performance-based plastic design (PBPD) approach for analyzing and designing high-rise RC-MRF frames while accounting for the inelastic behavior of the structure. In this study, a 24-story RC-MRF frame is selected for analysis and design, utilizing both the force-based design (FBD) method and the PBPD method for seismic loads. The PBPD approach considers three performance levels: immediate occupancy (IO), life safety (LS), and collapse prevention (CP). Indian standard code guidelines and principles are applied in the analysis and design of the frame. The performance assessment of the frame is conducted through nonlinear static pushover analysis. The results obtained indicate that the PBPD-LS frame outperforms the other frames. It is noteworthy that design sections in the PBPD-LS frame are found to be the most efficient, and the displacements remain within defined limits. On the other hand, the PBPD-IO frame is found to be highly uneconomical among the frames. Additionally, secondary moment effects (P-delta) appear to dominate in the PBPD-CP frame. Based on these observations, it can be concluded that, among all the frames, the PBPD-LS frame meets the desired PBPD outcomes and performs exceptionally well within the specified limits.