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<p>This study investigates and compares the seismic performance of structures with different types of plan irregularities, emphasizing the effects of the simultaneous application of bidirectional ground motion components. C-, L-, and T-shaped buildings, as well as a regular square-shaped building, are analyzed under site-specific recorded PEER ground motions in accordance with seismic code requirements. Structural responses, including interstory drift, story displacement, base shear, floor acceleration, and torsional irregularity are evaluated using modal analysis and nonlinear time-history analysis, considering both simultaneous and non-simultaneous application of bidirectional ground motion components. Three site-specific ground motion records with varying peak PGAs are used for nonlinear dynamic analysis and seismic response evaluation of horizontally uneven buildings. The results indicate that the flexural periods of all analyzed buildings are comparable; however, buildings with plan irregularities exhibit significantly longer torsional periods. The simultaneous application of bidirectional ground motions substantially amplifies structural responses, particularly in irregular buildings. For the regular building, top-story displacement and interstory drift increase by approximately 5%, whereas in irregular buildings these responses increase by 10% to 25% due to simultaneous bidirectional excitation. Similarly, top-floor acceleration increases by about 5% in the regular building, while irregular buildings experience increases ranging from 50% to 90%. The simultaneous application of ground motion components also leads to an increase in base shear of approximately 10% in the regular building and 12% to 20% in irregular buildings. Furthermore, plan irregularities alone result in a 10% to 20% increase in base shear compared to the regular building. These findings underscore the necessity of explicitly accounting for the simultaneous effects of multidirectional seismic loading during the planning and design stages. The study further suggests that current seismic design codes should be refined to better address the heightened vulnerabilities associated with plan-irregular building configurations.</p>

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Performance of Horizontally Irregular Buildings Under Bi-Directional Ground Motions

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Basir Zisan,
  • Sejan Ahmed Liman,
  • Mamun Islam,
  • Naimul Haque

摘要

This study investigates and compares the seismic performance of structures with different types of plan irregularities, emphasizing the effects of the simultaneous application of bidirectional ground motion components. C-, L-, and T-shaped buildings, as well as a regular square-shaped building, are analyzed under site-specific recorded PEER ground motions in accordance with seismic code requirements. Structural responses, including interstory drift, story displacement, base shear, floor acceleration, and torsional irregularity are evaluated using modal analysis and nonlinear time-history analysis, considering both simultaneous and non-simultaneous application of bidirectional ground motion components. Three site-specific ground motion records with varying peak PGAs are used for nonlinear dynamic analysis and seismic response evaluation of horizontally uneven buildings. The results indicate that the flexural periods of all analyzed buildings are comparable; however, buildings with plan irregularities exhibit significantly longer torsional periods. The simultaneous application of bidirectional ground motions substantially amplifies structural responses, particularly in irregular buildings. For the regular building, top-story displacement and interstory drift increase by approximately 5%, whereas in irregular buildings these responses increase by 10% to 25% due to simultaneous bidirectional excitation. Similarly, top-floor acceleration increases by about 5% in the regular building, while irregular buildings experience increases ranging from 50% to 90%. The simultaneous application of ground motion components also leads to an increase in base shear of approximately 10% in the regular building and 12% to 20% in irregular buildings. Furthermore, plan irregularities alone result in a 10% to 20% increase in base shear compared to the regular building. These findings underscore the necessity of explicitly accounting for the simultaneous effects of multidirectional seismic loading during the planning and design stages. The study further suggests that current seismic design codes should be refined to better address the heightened vulnerabilities associated with plan-irregular building configurations.