Optimal Placement of Viscous Dampers in Super Tall Buildings Based on Grid Shear Velocity

Zhao, Xin; Shi, Tao

doi:10.2749/222137814814027567

Cited by 2 publications

(2 citation statements)

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“…To analyze the seismic effect in a VD system, we usually define an additional damping ratio provided by the VD using the nonlinear time history analysis method to describe its nonlinearity; this allows us to evaluate the effect of the VD on the structure. Then we use the mode decomposition response spectrum method to evaluate and optimize the main structure, which helps realize the equipment design and decouple the main structure design, improving design efficiency . The virtual VD model of additional damping proposed in this paper is developed based on this idea.…”

Section: Optimal Design Of Vdsmentioning

confidence: 99%

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Multiperformance optimization design of a hybrid vibration mitigation system for super high‐rise buildings to improve earthquake resistance

Zhao

2020

Structural Design Tall Build

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Summary A structure must meet many performance requirements to survive an earthquake. For a super high‐rise structure, the dominant control performance metric is stiffness when considering earthquake resistance because the lateral displacement of the structure often does not meet the requirements of the code even if the structure meets strength requirements. For moderate and major earthquakes, stiffness and strength play a leading role jointly. Viscous damper (VD) and buckling restraint brace (BRB) are damping devices that are commonly used in modern engineering. The efficiencies of these devices are different for different situations, and combining them can yield improved structural vibration mitigation. In this study, the performances of VD and BRB are summarized. A kind of virtual VD model with an additional damping ratio is proposed on the basis of which a VD priority placement analysis method is developed, and an optimal design is proposed. A detailed analysis of various stress states of a BRB is also performed, and a BRB arrangement method based on brace stress level analysis is proposed. The two kinds of vibration damping equipment are combined in the structure, and a practical design method for a hybrid vibration damping system is proposed. The accuracy of the proposed method is verified by considering a 10‐story plane frame. Finally, a hybrid vibration mitigation design for different objective damping ratios is performed for a super tall building project, and the design results are compared. The analysis results show that a VD can effectively increase structural damping and reduce the seismic response of the structure. A BRB is used to replace supports that experience high stress and reduce their section size, thereby reducing costs. Therefore, the proposed hybrid vibration damping structure is cost effective while providing good energy dissipation and is thus promising for engineering applications.

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Section: Optimal Design Of Vdsmentioning

confidence: 99%

“…Then we use the mode decomposition response spectrum method to evaluate and optimize the main structure, which helps realize the equipment design and decouple the main structure design, improving design efficiency. [10] The virtual VD model of additional damping proposed in this paper is developed based on this idea.…”

Section: Virtual Vd Modelmentioning

confidence: 99%