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.
<p>Standardization is the key word of modular building, which requires modular building to have strong flexibility and replicability in engineering. Only by standardizing housing modules can factory assembly line production be realized. For modular buildings, buildings with similar functions often have similar height and load, and there is little difference in vertical load, while the difference of horizontal load in different sites can be huge. In order to realize the standardized construction of multi-intensity sites of modular houses, it is necessary to make the structural responses of different sites the same without changing the main structure. Based on the above background, a standardized design method for multi-intensity site damping of modular steel structures based on viscous dampers(VD) is proposed in this paper. the additional damping of the structure is increased by arranging viscous dampers to reduce the seismic response. in order to realize the construction of standard modular steel structure at different intensity sites, the automatic calculation of structural target additional damping ratio and the automatic design of viscous dampers are realized by coding design program. The optimal parameters, quantity and location of viscous dampers for different intensity areas can be obtained, and an actual high-rise modular steel structure engineering case is taken as an example to illustrate the correctness and applicability of this method.</p>
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