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Input energy spectra and energy characteristics of the hysteretic nonlinear structure with an inerter system

  • Wang, Yanchao (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Chen, Qingjun (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Zhao, Zhipeng (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Hu, Xiuyan (Shanghai Institute of Technology, College of Urban Construction and Safety Engineering)
  • Received : 2020.05.01
  • Accepted : 2020.08.13
  • Published : 2020.12.25

Abstract

The typical inerter system, the tuned viscous mass damper (TVMD), has been proven to be efficient. It is characterized by an energy-dissipation-enhancement effect, whereby the dashpot deformation of TVMD can be amplified for enhanced energy dissipation efficiency. However, existing studies related to TVMD have mainly been performed on elastic structures, so the working mechanism remains unclear for nonlinear structures. To deal with this, an energy-spectrum analysis framework is developed systematically for classic bilinear hysteretic structures with TVMD. Considering the soil effect, typical bedrock records are propagated through the soil deposit, for which the designed input energy spectra are proposed by considering the TVMD parameters and structural nonlinear properties. Furthermore, the energy-dissipation-enhancement effect of TVMD is quantitatively evaluated for bilinear hysteretic structures. The results show that the established designed input energy spectra can be employed to evaluate the total energy-dissipation burden for a nonlinear TVMD structure. Particularly, the stiffness of TVMD is the dominant factor in adjusting the total input energy. Compared with the case of elastic structures, the energy-dissipation-enhancement effect of TVMD for nonlinear structures is weakened so that the expected energy-dissipation effect of TVMD is replaced by the accumulated energy dissipation of the primary structure.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (grant no. 51778489), the National Science and Technology Pillar Program of China (grant no. 2015BAK17B04), and the Basic Research Project of State Key Laboratory of Ministry of Science and Technology (grant no. SLDRCE19A-02). All support is gratefully acknowledged.

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