Wind-induced Vibration Control Efficiency Analysis Of High-rise Structure With TMD System

With the rapid development of science and technology, more and more tall buildings have been built around the world with more and more height. As these tall buildings are constructed with light materials and small damping ratios, they are becoming more and more sensitive to the wind loading on them. As the inherent frequency of these type of high-rise structure is close to the predominant frequency of strong wind, the wind-induced response could be amplified. The effect of wind load action may affect the safety and comfort of the structure, it is necessary to install the dampers in the structure to suppress the vibration of the structure to increase the reliability and comfort. As the Tuned Mass Damper(TMD) can be installed easily and can control the wind-induced vibration response of structure effectively, two fire-proof water tanks are installed atop of Canton Tower to control the wind vibration response of structure in strong winds. The wind-induced vibration response and control efficiency of TMD are compared under different load cases. The main content and research output of the thesis was listed the following:Firstly, the power spectral density of along- and across- fluctuating wind speed and lateral wind loading as result of vortex shedding effect for tall buildings with circular cross section were proposed in this study. The random vibration theory of wind-induced response was discussed by implementing the supplemental TMD structural systems. Meanwhile the threedimensional FE model of structure was simplified for the wind-induced response and vibration control efficiency analysis by frequency domain method.Secondly, the dynamic kinematic equations of structural system with the supplemental TMD system are simplified in this study. The frequency domain analysis of wind-induced response of the Canton Tower was conducted by the proposed CQC method The control efficiency of TMD on the wind-induced response of main structure were analyzed by frequency domain method.Thirdly, the harmonic superposition method is adopted for numerical simulation of alongwind and across-wind loading along the height of the Canton Tower. The wind-induced displacement and acceleration responses were estimated by time-history dynamics analysis methods when different damping ratios and wind speeds with different recurrence intervals were selected. The effect of above parameters and the mechanical properties of TMD system in Canton Tower on the vibration control efficiency were comprehensively analyzed by SAP2000 software. Numerical analysis showed that the vibration control efficiency of the along windinduced displacement was 21% under the wind speed with 100 years in recurrence intervals. While the vibration control efficiency of the along wind-induced acceleration response was 25% under the wind speed with 10 years in recurrence intervals.However the control efficiency of wind-induced response in the across wind direction is not obvious as the relative windinduced responses between the main structural system and supplemental TMD system is quite small.