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<p>The non-uniform distribution of forces and deformations in lateral force resisting elements (LFREs) is a challenge to the seismic design of asymmetric structures according to current seismic codes. However, the effects of the asymmetry on the seismic design parameters of such buildings is often neglected in current seismic design codes directly. It is evident that a new seismic design methodology is necessary to minimize the non-uniformity of deformation and ductility demands at each level of asymmetry. In the present research, buildings with different levels of normalized yield displacement eccentricity (e<sub>d</sub>/A) were designed according to the ASCE/SEI 07-22 seismic code (code-design model) and were compared with the balance-25% and symmetric-strength models. The seismic design parameters of the response modification factor (R), period-based ductility (µ<sub>T</sub>), overstrength factor (Ω), deflection amplification factor (C<sub>d</sub>) and adjusted collapse margin ratio (ACMR) were calculated and evaluated according to FEMA P695. The results indicate that R and µ<sub>T</sub> were relatively more uniform in the balance-25% model, but decreased strongly in the code-design model with an increase in e<sub>d</sub>/A. This can be challenging in seismic design codes. Two solutions have been proposed for the seismic design of asymmetric buildings The first is the implementation of modified relationships for seismic design parameters, in order to improve the safety margin of asymmetric structures. The second is application of the balance-25% model as the preferred approach for minimal dependence on e<sub>d</sub>/A.</p>

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Modification of seismic design parameters for multi-story asymmetric buildings with improvement of safety margin

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Omid Makhdoom,
  • Armin Aziminejad,
  • Panam Zarfam,
  • Abdolreza S. Moghadam

摘要

The non-uniform distribution of forces and deformations in lateral force resisting elements (LFREs) is a challenge to the seismic design of asymmetric structures according to current seismic codes. However, the effects of the asymmetry on the seismic design parameters of such buildings is often neglected in current seismic design codes directly. It is evident that a new seismic design methodology is necessary to minimize the non-uniformity of deformation and ductility demands at each level of asymmetry. In the present research, buildings with different levels of normalized yield displacement eccentricity (ed/A) were designed according to the ASCE/SEI 07-22 seismic code (code-design model) and were compared with the balance-25% and symmetric-strength models. The seismic design parameters of the response modification factor (R), period-based ductility (µT), overstrength factor (Ω), deflection amplification factor (Cd) and adjusted collapse margin ratio (ACMR) were calculated and evaluated according to FEMA P695. The results indicate that R and µT were relatively more uniform in the balance-25% model, but decreased strongly in the code-design model with an increase in ed/A. This can be challenging in seismic design codes. Two solutions have been proposed for the seismic design of asymmetric buildings The first is the implementation of modified relationships for seismic design parameters, in order to improve the safety margin of asymmetric structures. The second is application of the balance-25% model as the preferred approach for minimal dependence on ed/A.