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<p>Mitigating seismic responses in steel structures remains a major challenge in structural engineering, especially for base-isolated (BI) structures such as those using Lead Rubber Bearings (LRBs). This study investigates the effectiveness of a Nonlinear Tuned Mass Damper Inerter (NTMDI) system in reducing structural vibrations during earthquakes. The NTMDI system is innovative in combining nonlinear stiffness with an inerter to enhance energy dissipation and structural resilience. Key parameters—damping, frequency, mass, and inertance ratios—are fine-tuned using the Crayfish Optimization Algorithm (COA), which enables adaptation to various seismic scenarios. A 10-story shear frame steel structure was modeled in OpenSees for nonlinear dynamic analysis using ten real earthquake records with diverse characteristics. Results show that the NTMDI system significantly reduces key response metrics: LRB force by 34.18%, roof displacement by 27.45%, acceleration by 21.33%, base shear by 31.54%, and kinetic energy by 29.88%. These findings highlight the NTMDI system’s potential as a robust solution for enhancing seismic performance in mid-rise steel structures.</p>

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Mitigating dynamic response in base-isolated mid-rise steel structures using NTMDI under earthquake excitation

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Mohammad Alibabaei Shahraki,
  • Ahmadreza Hajipour,
  • Nima Rabiei

摘要

Mitigating seismic responses in steel structures remains a major challenge in structural engineering, especially for base-isolated (BI) structures such as those using Lead Rubber Bearings (LRBs). This study investigates the effectiveness of a Nonlinear Tuned Mass Damper Inerter (NTMDI) system in reducing structural vibrations during earthquakes. The NTMDI system is innovative in combining nonlinear stiffness with an inerter to enhance energy dissipation and structural resilience. Key parameters—damping, frequency, mass, and inertance ratios—are fine-tuned using the Crayfish Optimization Algorithm (COA), which enables adaptation to various seismic scenarios. A 10-story shear frame steel structure was modeled in OpenSees for nonlinear dynamic analysis using ten real earthquake records with diverse characteristics. Results show that the NTMDI system significantly reduces key response metrics: LRB force by 34.18%, roof displacement by 27.45%, acceleration by 21.33%, base shear by 31.54%, and kinetic energy by 29.88%. These findings highlight the NTMDI system’s potential as a robust solution for enhancing seismic performance in mid-rise steel structures.