超高烟囱多维地震响应及设置粘滞阻尼器控制研究

发布时间：2018-03-17 23:10

本文选题：超高烟囱　切入点：摇摆地震动　出处：《武汉理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：烟囱作为火力发电厂中不可或缺的高耸构筑物,对于电力系统的正常运行有着至关重要的重要作用。它类似于一个独立悬臂结构,几乎没有赘余杆件,在结构内部可以设置的抗震防线也相对较少,在地震作用下,一旦烟囱结构的某个截面出现塑性铰则必然将造成严重破坏,带来重大损失。然而,在对高耸烟囱进行抗震设计计算时,人们通常仅考虑水平地震作用和竖向地震作用,而忽略了地震动摇摆分量对结构的影响,事实上,对于震源附近的结构而言,摇摆地震动对其产生的动力响应是不可忽视的。因此,为确保烟囱结构设计的可靠性,对高耸烟囱结构进行多维地震响应分析并采取相应的减震控制措施就显得尤为必要。本文以四川某火电厂超高烟囱为研究对象,对超高烟囱结构进行了多维地震作用下的有限元数值模拟分析,并根据悬挂式钢内筒烟囱结构的特点,提出了在烟囱的止晃点设置粘滞阻尼器的消能减震方法。主要包括以下几方面的内容:1、采用专业有限元软件SAP2000建立超高烟囱结构的有限元模型并进行水平地震El Centro波、Taft波及人工波作用下的时程分析和反应谱分析,从位移响应,内力响应及加速度响应等方面宏观分析了超高烟囱结构的抗震性能。2、运用有限元软件SAP2000对超高烟囱模型进行多维地震作用下的动力时程分析,对比分析了超高烟囱在水平地震动单独作用、摇摆地震动单独作用、水平-摇摆地震动耦合作用及水平-摇摆-竖向地震动耦合作用四种工况下烟囱结构的位移,内力和加速度等动力响应,着重探讨了摇摆地震动对超高烟囱结构的影响。3、根据悬挂式钢内筒烟囱结构的特点,提出在烟囱的止晃点设置粘滞阻尼器的消能减震方法,并采用SAP2000分别建立了设置粘滞阻尼器的烟囱结构模型和传统烟囱结构模型,分别对他们进行多遇和罕遇地震作用下的时程分析和地震反应谱分析。将多种工况下烟囱结构的位移,剪力、加速度等响应进行对比,分析了粘滞阻尼器结构的减震效果。
[Abstract]:As an indispensable towering structure in thermal power plant, chimney plays an important role in the normal operation of power system. It is similar to an independent cantilever structure and has few redundant members. There are relatively few seismic lines which can be set up inside the structure. Under earthquake, once plastic hinge appears in a section of chimney structure, it will cause serious damage and bring great loss. In seismic design calculation of tall chimney, people usually only consider horizontal earthquake and vertical earthquake, but ignore the influence of rocking component of ground motion on the structure. In fact, for the structure near the earthquake source, The dynamic response of rocking ground motion to it can not be ignored. Therefore, in order to ensure the reliability of the design of chimney structure, It is necessary to analyze the multi-dimensional seismic response of the tall chimney structure and take the corresponding measures to reduce and control the earthquake. In this paper, the super-high chimney of a thermal power plant in Sichuan Province is taken as the research object. The finite element numerical simulation analysis of super-high chimney structure under multi-dimensional earthquake is carried out, and according to the characteristics of hanging steel inner chimney structure, The energy dissipation and vibration absorption method with viscous damper at the stop point of chimney is put forward. The main contents are as follows: 1. The finite element model of super-high chimney structure is established by professional finite element software SAP2000 and the horizontal earthquake El is carried out. Time history analysis and response spectrum analysis of Centro wave Taft wave and artificial wave. The aseismic performance of ultra-high chimney structure is analyzed macroscopically from the aspects of displacement response, internal force response and acceleration response. The dynamic time-history analysis of ultra-high chimney model under multi-dimensional earthquake is carried out by using finite element software SAP2000. In this paper, the displacement of chimney structure under four conditions of horizontal ground motion alone, rocking ground motion alone, horizontal rocking ground motion coupling and horizontal rocking vertical ground motion coupling is compared and analyzed. In this paper, the influence of rocking ground motion on ultra-high chimney structure is discussed. According to the characteristics of hanging steel chimney structure, the energy dissipation and damping method with viscous damper at the stop point of chimney is put forward. The chimney structure model with viscous dampers and the traditional chimney structure model are established by SAP2000, respectively. The time history analysis and seismic response spectrum analysis of the chimney structure under rare and rare earthquakes were carried out respectively. The seismic absorption effect of viscous damper structure was analyzed by comparing the displacement, shear force and acceleration responses of chimney structure under various working conditions.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.11

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