Analysis On Wind-induced Response And Vibration Control Of High-rise TV Tower

The main features of high-rise tower are higher height, low horizontal stiffness and significantly dynamic response under wind load. So wind resistant calculation becomes an important part of high-rise structural design and wind vibration control becomes hotspot in the field of vibration control.Taking a high-rise TV tower as analysis object, the dynamic response of the high-rise tower under wind loads of 100 year frequency is calculated in this paper. In order to meet the structural safety and comfort requirements, viscoelastic dampers are installed in the appropriate parts of the structure for wind-induced vibration control.The main research works in this dissertation are as follows:1 MATLAB is compiled to program fluctuating wind load time history simulation program based on M. Shinozuka method. Then test the wind load sample curves to make sure that they are in accordance with the wind load records and can be used in wind-induced response calculation and control analysis.2 Using finite element software ANSYS to establish the three-dimensional finite element model of the high-rise TV tower and to analyze its dynamic characteristics. According to the dynamic characteristics of the high-rise TV tower to educe two-dimensional series multi-degree modal which is suitable for vibration and control analysis.3 Frequency domain and time domain method are separately used to calculate wind-induced response of the high-rise TV tower. The reliability of the results can be verified by comparing the calculation results of two kinds of analysis methods. Then determine the dynamic response of the whole structure under wind load. 4 Design viscoelastic dampers and determine the number and appropriate installation position of viscoelastic dampers by calculation. The wind-induced responses of the high-rise TV tower using viscoelastic dampers are within the safety range, which meet the structural safety and human comfort requirements.The calculation and analysis shows that the displacement and acceleration response of the high-rise tower under wind loads of 100 year frequency exceed the standard requirement and affect the safety, durability and comfort requirements of the high-rise tower. The displacement and acceleration responses can effectively reduced after viscoelastic dampers installed in the high-rise tower, which meet the standard requirement.