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<p>This study investigates the performance of Negative Stiffness Amplifying Dampers (NSAD) in mitigating the dynamic response of two interconnected single-degree-of-freedom (SDOF) structures subjected to seismic excitations and cyclic pulse inputs. A comparative analysis is conducted to evaluate the response of interconnected and unconnected SDOF structures equipped with NSAD. The proposed passive control device, Negative Stiffness Damper, enhances energy dissipation by amplifying damping effects, thereby significantly reducing acceleration and displacement responses. The study demonstrates the efficacy of NSAD in mitigating seismic responses by analyzing its performance in three configurations: Configuration I, Configuration II, and Configuration III. Governing equations of motion are derived, and numerical integration is performed using the Newmark-beta method. The investigation includes the dynamic behavior of SDOF systems equipped with NSAD under both stochastic (cyclic pulse) and real seismic excitations. A dataset of 22 real seismic events, comprising Near-Field and Far-Field records, is utilized for evaluation. Additionally, the study extends to multi-degree-of-freedom systems equipped with NSAD, exploring the influence of optimal device parameters, such as damping ratios and installation locations, in achieving effective response mitigation. Finally, strategies employing the optimum parameters of NSAD are considered to mitigate dynamic responses of dissimilar adjacent structures by selecting appropriate mass ratios and positions for NSAD installation.</p>

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Dynamic Response Mitigation of Adjacent Structures Using Negative Stiffness Amplifying Dampers Under Seismic and Cyclic Pulse Excitations

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • K. K. Kiran,
  • D. T. Naveenkumar

摘要

This study investigates the performance of Negative Stiffness Amplifying Dampers (NSAD) in mitigating the dynamic response of two interconnected single-degree-of-freedom (SDOF) structures subjected to seismic excitations and cyclic pulse inputs. A comparative analysis is conducted to evaluate the response of interconnected and unconnected SDOF structures equipped with NSAD. The proposed passive control device, Negative Stiffness Damper, enhances energy dissipation by amplifying damping effects, thereby significantly reducing acceleration and displacement responses. The study demonstrates the efficacy of NSAD in mitigating seismic responses by analyzing its performance in three configurations: Configuration I, Configuration II, and Configuration III. Governing equations of motion are derived, and numerical integration is performed using the Newmark-beta method. The investigation includes the dynamic behavior of SDOF systems equipped with NSAD under both stochastic (cyclic pulse) and real seismic excitations. A dataset of 22 real seismic events, comprising Near-Field and Far-Field records, is utilized for evaluation. Additionally, the study extends to multi-degree-of-freedom systems equipped with NSAD, exploring the influence of optimal device parameters, such as damping ratios and installation locations, in achieving effective response mitigation. Finally, strategies employing the optimum parameters of NSAD are considered to mitigate dynamic responses of dissimilar adjacent structures by selecting appropriate mass ratios and positions for NSAD installation.