期刊
JOURNAL OF STRUCTURAL ENGINEERING
卷 148, 期 9, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)ST.1943-541X.0003454
关键词
Footbridges; Metamaterial beam; Band gap; Vibration reduction; Periodic structures
资金
- National Natural Science Foundation of China [51808208, 51878151]
- Fundamental Research Funds for Central Universities [2242021R20011]
This study introduces a band gap in a footbridge and develops a new technique using inerter-based dynamic vibration absorbers (IDVAs) to suppress the human-induced vibration response. The proposed method converts the conventional box girder into a specially designed periodic metamaterial beam with a local resonance band gap. The band gap structure is validated through test results and numerical experiments, and a computer-based program is presented to determine the reasonable design parameters of IDVAs. The results show that the proposed method exhibits good performance in vibration attenuation.
As footbridges are lightweight and slender structures, they are highly sensitive to human-induced excitation, and control measures are required to suppress undesirable structural vibrations. As wave propagation is improbable within a band gap, this study introduces a band gap in a footbridge and develops a new technique as an alternative to suppress the human-induced vibration response. Inerter-based dynamic vibration absorbers (IDVAs) are arranged periodically in the footbridge, which can convert the conventional box girder into a specially designed periodic metamaterial beam with a local resonance band gap. Following the spectral element method, the band gap structure of the metamaterial beam with IDVAs is proposed and validated by test results and numerical experiments. The band gap structure can be simultaneously tuned by the parameters of the IDVAs, including spring stiffness, inertance, and attached mass. A computer-based program was presented to determine the reasonable design parameters of IDVAs. Finally, a new vibration attenuation method for footbridges is proposed based on the theory of metamaterials and validated by numerical experiments. The results show that the proposed method exhibits good performance in vibration attenuation.
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