【作者】 罗书泉；

【导师】 胡卫兵；

【作者基本信息】 西安建筑科技大学 ， 现代结构理论， 2010， 硕士

【摘要】 高耸电视塔结构的主要特点是高度较高,水平方向刚度较小,在风荷载作用下动力响应明显。因此高耸电视塔结构的抗风计算及风振控制,己成为高耸结构设计的重要内容和结构振动控制领域的研究热点。本文选用南方某高耸电视塔作为分析对象,计算了该电视塔结构在100年一遇的风荷载作用下结构的动力响应,并在该结构合适的部位加入了粘弹性阻尼器对其进行风振控制,以满足结构安全性和舒适度的要求。具体作了如下的研究工作：1.根据M. Shinozuka方法,利用MATLAB编制了脉动风荷载时程模拟程序,并对风荷载样本曲线进行检验,使其符合实际风荷载记录,可用于结构风振响应计算与控制分析。2.利用有限元分析软件ANSYS建立电视塔的三维有限元模型,分析其动力特性,并根据其动力特性建立适合于振动与控制分析的二维串联多自由度模型。3.分别采用频域法和时域法对高耸电视塔结构进行风振响应计算,对比两种分析方法的计算结果,互相验证了计算结果的可靠性,以确定整个结构在风荷载作用下的动力响应。4.设计粘弹性阻尼器,通过计算来确定阻尼器的个数及合适的安装位置,将风振对结构的影响限制在安全范围以内,满足结构安全性和人体舒适度的要求。通过计算和分析表明,在100年一遇的风荷载作用下,该电视塔的位移和加速度响应均超出规范要求,影响结构的安全性、耐久性和舒适度要求。安装粘弹性阻尼器后,结构的位移响应和加速度响应大幅减小,满足规范要求。更多还原

【Abstract】 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.更多还原