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Substructure shake table test for equipment‐adjacent structure–soil interaction based on the branch mode method
Author(s) -
He Tao,
Jiang Nan
Publication year - 2019
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.1573
Subject(s) - substructure , earthquake shaking table , structural engineering , soil structure interaction , dynamic testing , engineering , shake , damping ratio , vibration , flexibility (engineering) , mode (computer interface) , coupling (piping) , reduction (mathematics) , structural system , computer science , mathematics , finite element method , acoustics , physics , mechanical engineering , geometry , statistics , operating system
Summary A substructure shake table test (SSTT) based on the branch mode method was performed to reveal the mechanism and rules of equipment‐adjacent structure–soil interaction (EASSI) under a seismic effect. EASSI system was divided into three substructures, namely, equipment‐single structure, foundation soil, and adjacent structure. The coupling terms of interaction among the substructures were proposed. The branch mode method was effectively applied to the SSTT by decomposing and transforming the dynamic equation of the entire system and utilizing the coupling terms of interaction for data exchange among substructures. The degree of freedom was reduced for the linear substructures. Experiments indicated that in EASSI, the presence of soil magnified the flexibility and equivalent damping of the entire system. The overall effect was presented as a reduction in the dynamic response of the system. The dynamic feedback of the equipment inhibited the dynamic response of the main structure, which intensified the rate of vibration attenuation of the system. The seismic response analysis was also performed for the system when the mass ratio and frequency ratio between the equipment and the main structure and the position of the equipment in the main structure varied.