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Aseismic high-rise structure with visco-elastically connected shear- and flexural-subsystems
Highlights Novel visco-elastic connection between shear- and flexural-subsystems. Quantified seismic response of visco-elastic shear-flexural structure. Notable acceleration-mitigation while not amplifying displacement. Insights into dynamic characteristic of visco-elastic shear-flexural structure.
Abstract For a high-rise structure composed of a shear- and a flexural-type subsystem, its seismic performance can be improved as the rigid link between the subsystems being replaced by a viscoelastic connection (VEC). This structural system, termed viscoelastic shear-flexural (VeSF) structure, has an amplified flexibility and an enlarged damping, thus exhibits a mitigated acceleration and a modified displacement response. In this research, a novel feasible configuration with a low invasive feature to attain such a VeSF structure is proposed. The proposal decouples the rigid link between the shear- and the flexural-type subsystems while maintaining the latter’s ability to bear the gravity load of the floor. An elaborated modelling and computation lead us to the subsequent findings: (1) the acceleration of a VeSF structure could be 20–40% smaller than that of a conventional structure, and such a reduction gets more pronounced as the stiffness of VEC decreases or the mass on the shear-type subsystem increases; (2) the drift of the shear-type subsystem in a VeSF structure moderately increases at the bottom while remarkably decreases at the near-top zone; (3) as the shear-type subsystem gets stiffer, the acceleration-mitigation effect of the system gets weakened. Eigenvalue analyses reveal that the higher-order modal response, which contributes significantly to the acceleration response of a VeSF structure, is notably repressed. The response of the fundamental mode, which contributes the most to the displacement response, is barely mitigated. Thus, the VeSF structure is better at controlling the acceleration than the displacement.
Aseismic high-rise structure with visco-elastically connected shear- and flexural-subsystems
Highlights Novel visco-elastic connection between shear- and flexural-subsystems. Quantified seismic response of visco-elastic shear-flexural structure. Notable acceleration-mitigation while not amplifying displacement. Insights into dynamic characteristic of visco-elastic shear-flexural structure.
Abstract For a high-rise structure composed of a shear- and a flexural-type subsystem, its seismic performance can be improved as the rigid link between the subsystems being replaced by a viscoelastic connection (VEC). This structural system, termed viscoelastic shear-flexural (VeSF) structure, has an amplified flexibility and an enlarged damping, thus exhibits a mitigated acceleration and a modified displacement response. In this research, a novel feasible configuration with a low invasive feature to attain such a VeSF structure is proposed. The proposal decouples the rigid link between the shear- and the flexural-type subsystems while maintaining the latter’s ability to bear the gravity load of the floor. An elaborated modelling and computation lead us to the subsequent findings: (1) the acceleration of a VeSF structure could be 20–40% smaller than that of a conventional structure, and such a reduction gets more pronounced as the stiffness of VEC decreases or the mass on the shear-type subsystem increases; (2) the drift of the shear-type subsystem in a VeSF structure moderately increases at the bottom while remarkably decreases at the near-top zone; (3) as the shear-type subsystem gets stiffer, the acceleration-mitigation effect of the system gets weakened. Eigenvalue analyses reveal that the higher-order modal response, which contributes significantly to the acceleration response of a VeSF structure, is notably repressed. The response of the fundamental mode, which contributes the most to the displacement response, is barely mitigated. Thus, the VeSF structure is better at controlling the acceleration than the displacement.
Aseismic high-rise structure with visco-elastically connected shear- and flexural-subsystems
Xiang, Yang (author) / Wang, Meng (author) / Sun, Fei-Fei (author) / Li, Guo-Qiang (author)
Engineering Structures ; 291
2023-05-31
Article (Journal)
Electronic Resource
English
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