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<p>This study investigates the seismic performance of eleven-story reinforced concrete buildings with flat slabs featuring plan irregularities (floor rotations of 5°) and vertical irregularities (varying floor areas from 7900 to 2025&#xa0;m<sup>2</sup>). A novel macro-modeling approach was developed to capture the nonlinear behavior of shear walls, achieving 5–8% prediction accuracy compared to experimental results. Four configurations were analyzed: bare frame, core shear walls, corner shear walls, and combined systems. Seismic performance evaluation measured lateral displacements, story drifts, shear wall contribution factors, and drift reduction effectiveness through static and dynamic analyses. Results demonstrate significant performance improvements with strategic shear wall placement. Core configurations showed superior performance with contribution factors exceeding 95% and drift reduction factors of 1.8–2.2. Corner configurations achieved substantial improvements with factors of 1.6–2.0. The performance-based optimization framework yielded 15–18% system strength enhancement while maintaining controlled deformation capacity, achieving 42–52% drift reductions compared to 35–40% reported in previous studies on regular buildings. This methodology successfully addresses design challenges in buildings with multiple simultaneous irregularities, providing engineers with tools for safer, more efficient earthquake-resistant structures in seismic regions.</p>

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Seismic Behavior of Multistory Flat Slab Buildings with Plan and Vertical Irregularities and Shear Wall Configurations

  • 期刊论文

  • 发表日期：

    2025年12月7日

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  • Akash Jaiswal,
  • Mahesh Chandra,
  • Arti Sahu

摘要

This study investigates the seismic performance of eleven-story reinforced concrete buildings with flat slabs featuring plan irregularities (floor rotations of 5°) and vertical irregularities (varying floor areas from 7900 to 2025 m2). A novel macro-modeling approach was developed to capture the nonlinear behavior of shear walls, achieving 5–8% prediction accuracy compared to experimental results. Four configurations were analyzed: bare frame, core shear walls, corner shear walls, and combined systems. Seismic performance evaluation measured lateral displacements, story drifts, shear wall contribution factors, and drift reduction effectiveness through static and dynamic analyses. Results demonstrate significant performance improvements with strategic shear wall placement. Core configurations showed superior performance with contribution factors exceeding 95% and drift reduction factors of 1.8–2.2. Corner configurations achieved substantial improvements with factors of 1.6–2.0. The performance-based optimization framework yielded 15–18% system strength enhancement while maintaining controlled deformation capacity, achieving 42–52% drift reductions compared to 35–40% reported in previous studies on regular buildings. This methodology successfully addresses design challenges in buildings with multiple simultaneous irregularities, providing engineers with tools for safer, more efficient earthquake-resistant structures in seismic regions.