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设有阻尼装置的结构的分析和研究
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摘要
振动控制是建筑结构抵抗地震作用,减小地震响应的一种有效方法。其中利用附加隔震支座或阻尼器对结构进行被动控制的方法,由于其有效性、经济性,而被越来越多的结构设计所采用。
     本文利用层剪切模型探讨了隔震、消能减震结构的分析和设计方法。处理了非经典阻尼的问题,并运用一定的假设,得到了该模型下结构响应和阻尼的关系。
     本文以框架结构作为研究对象,分析采用基底隔震和附加粘弹性阻尼器的结构的减震效果及其地震反应。为此,编制了隔震、减震框架结构的非线性动力时程分析程序。程序中对框架结构采用空间杆系模型。以一幢6层框架结构为例,分别对不附加阻尼装置、加粘弹性阻尼器和加隔震支座几种方案,输入El Centro和Taft地震波,进行时程分析。
     研究结果表明不论是附加阻尼器装置结构还是隔震结构,都能明显改善结构的动力特性,减小结构在地震中的响应。对于隔震结构运用于多层和一般高层建筑有其固有的优势,而对于更高层的或柔性的建筑结构,并考虑到风振,在上部结构附加阻尼装置是更好的选择。
Vibration control has become a effective solution to reduce the response of structures in earthquake. One of these methods, passive control using base isolation technique or dampers, has been applied to more and more projects in the past, because they can reduce the seismic response effectively and economically.
    In this paper, the analysis and design method of base seismic isolated and energy dissipated structure using the MDOF model has-been studied. Using the structural dynamic theoretics and some supposes dealt with the non-proportionally damped structural systems and deduced the relation of structural response and damp.
    In this paper, the seismic reduction effectivness and earthquake response of RC frame structrre adopting base seismic isolation or added viscous dampers has been studied. A program used to dynamic time history analysis was woven to analyze the character of the nonlinear system. Dimensional beam-column elements model is used to describe the RC frame structure. One six storey RC frame building adopting base seismic isolation, added viscous dampers or traditional techuique with imposed the El Centre and Taft earthquake wave was analyzed as an example in this paper.
    The researth results illustract that added viscous dampers structures and base seismic isolated structures can improve the dynamic character of structures obviously and minish the earthquake response of structures. The base seismic isolated structures have advantage in used in multilayer and common high buildings. But for the higher buildings added viscous dampers on it is the better choice with thinking over shake by wind.
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