Abstract
A double-layer tuned mass damper (DTMD) has advantages of wide damping frequency band and strong robustness. At present, there is a lack of seismic design methods for high-rise structures based on DTMDs. In this study, a DTMD parameter optimisation method was proposed, with the objective of minimising the peak displacement response of a first N-order vibration modal with a vibration mass participation factor of 85%. Then, a scale model of a high-rise structure was fabricated, along with a corresponding DTMD. Different types of excitations were chosen to clarify the dynamic responses of the model with and without the DTMD, including Site-II ground motions, long-period (LP) ground motions without pulses, and near-fault pulse-type (NFPT) ground motions. The results indicate that the dynamic responses of high-rise structures under LP and NFPT ground motions are much greater than those under Site-II ground motions. The DTMD can effectively reduce the absolute displacement response, acceleration response, and strain response at the top floor of the test model. However, the DTMD has a time delay in providing the damping effect. A smaller damping ratio between the upper TMD and the controlled structure will lead to a more significant damping effect for the DTMD.
Highlights
With the rapid development of urbanisation and the economy, high-rise structures play an important role in urban modernisation
Owing to the characteristics of highrise structures, such as a long natural vibration period, multiorder modes participating in vibration, sensitivity to wind, and earthquake-induced responses [1,2,3,4], seismic design has always been the focus. erefore, researchers have conducted a series of studies on improving the seismic performance of high-rise structures, focusing on the application of steel-concrete composite structures and the introduction of energy dissipation measures
To verify the theoretical results, this study considered different boundary conditions for the connection when studying the damping effect of the double-layer tuned mass damper (DTMD). ey were (1) case-I (the connection was filled with the polytrifluorochloroethylene (PCTFE), and the equivalent damping ratio was in the range of 0.26 to 0.56); (2) case-II; (3) case-III
Summary
With the rapid development of urbanisation and the economy, high-rise structures play an important role in urban modernisation. Erefore, researchers have conducted a series of studies on improving the seismic performance of high-rise structures, focusing on the application of steel-concrete composite structures and the introduction of energy dissipation measures. E core tube of the Shanghai Centre Tower adopted the SRC structure, and through a shaking table test of a 1/40-scale model, Tian et al [5] showed that the structure could meet the seismic performance target required by the design. Cao [6,7] took Beijing China Zun as a prototype and, through a series of seismic performance tests, found that the CFST mega-column (with a complex cross section and multiple cavities) could significantly improve the bearing capacity and elastic deformation capacity of the structure. Guangzhou’s New TV Tower [8] and Tianjin’s Jin Tower [9] adopted CFST mega-columns as the main bearing members. rough theoretical analysis and experimental research, it was concluded that these structures had a good
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
