【作者】 孙晓刚；

【导师】 张文福；

【作者基本信息】 大庆石油学院 ， 结构工程， 2007， 硕士

【摘要】 电视塔的高柔特性使其在风荷载和地震作用下结构的动力响应显著。传统的抗震和抗风设计方法是利用结构自身的能力来耗散振动能量,如加大结构截面,增强结构刚度等。对已建成的电视塔,当结构响应超限时,进行振动控制是保证结构安全的有效方法。近年来,智能材料的研究与应用给结构振动控制技术开辟了新的天地。目前利用磁流变阻尼器对高耸塔架结构的减振研究还不多,有待进一步解决和完善。本文以大庆电视塔为研究对象,通过具体结构来分析MR阻尼器在电视塔结构中的应用。本文主要研究工作包括:1、总结和分析了MR阻尼器的数学模型,对主动、半主动控制算法进行了研究,并利用Matlab软件中的Simulink仿真技术对一个十层框架结构进行了仿真分析和结果比较。2、对MR阻尼器的位置优化问题进行了研究。总结了目前主要使用的几种优化方法,分析了基于二次型性能指标增量为目标函数的最优布置方法,并将此方法得到的布置方式和其它方法所得的布置方式进行了比较分析。3、采用sap2000软件建立了大庆电视塔的三维有限元模型,并进行了结构的动力特性分析。根据有关假设,将大庆电视塔的三维模型缩聚形成二维串联多自由度动力模型。4、利用小波分析模型模拟出21条大庆电视塔的脉动风速时程。分析了电视塔在风荷载和地震作用下结构的动力特性以及安装MR阻尼器后对风振和地震反应的控制效果。更多还原

【Abstract】 For TV Tower, its high supple characteristic causes the remarkable structural dynamic response under the wind load and the seismic excitations. The traditional method of seismic design and wind-resistant design is to dissipate the vibration energy through themselves ability, such as increases structural section, and enhances structural stiffness. When the structural response goes beyond the limit, the vibration control is the most effective way to ensure the safety of the completed tower.Research and application of intelligent materials for the structural vibration control technology has opened up a new world for the structure vibration control technology. At present, the research using Magnetorheological damper on control for vibrant responses of high-rise truss tower not to be many,Research has yet to be corrected and improved. This paper takes the Daqing television tower as the research object, and through this specific structure to analyze the application of Magnetorheological damper on the TV tower structure.The main research contents are stated as follow:Part 1: The mathematical model of the Magnetorheological damper is summarized and analyzed. The active control and the semi-active control algorithm have been researched. Using the Matlab procedure, the Simulink simulation technology has been used to carry on the simulation analysis for a 10-storey framework structure, and the results of analysis were compared.Part 2: It has conducted the research to the control device optimized arrangement, summarized the main several optimized method that present use. Based on the quadratic performance index, it analyzed optimal placement of control devices layout methods. And the arrangement way that obtained by this optimized method have been carried out the comparative analysis with other different arrangement ways.Part 3: A three-dimensional finite element model of the Daqing television tower was established by sap2000 software and analyzed the dynamic properties. According to the related assumption, three-dimensional finite element model of the Daqing television tower was concentrated to the multi- degrees of freedom dynamic model.Part 4: It simulated 21 pulsating wind velocity time-history of Daqing television tower using the wavelet analysis model. It analyzed the structure dynamic characteristics of the television tower under wind load and seismic as well as analyzed the control effect after the Magnetorheological damper was imposed.更多还原