分段隔震新体系的参数设计与减震性能研究
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摘要
本文将基础和中间层隔震同时采用的分段隔震概念应用到高层建筑的减震控制当中,利用双质点简化模型,提出各隔震层刚度和阻尼参数的选取方法,并对一栋分别采用基础隔震和分段隔震的20层高层建筑模型进行仿真分析。通过与传统基础隔震结构比较可以发现,地震作用下基础隔震层的变形能够按比例分配到分段隔震体系的基础和中间隔震层当中,减弱了高阶振型在建筑物顶部的"鞭梢"效应,降低了由于支座受拉或剪压破坏导致上部结构倾覆失稳倒塌的可能。此外,中间隔震层在分段隔震体系中的设置位置也相当重要。
A new concept that isolation devices installed at base and mid-story is applied to attenuate the seismic responses of high-rise building.A method to select the stiffness and damping parameters of each isolation layer is presented based on two-DOF simple model.And a numerical simulation on a twenty-story high-rise building controlled by segmented isolation system is carried out.Compared with the traditional base isolation structure,the lateral deformation of the base isolation layer is distributed to isolation layers of segmented isolation system,and the whiplash effect of the top building resulted by the high-order vibration modes can be attenuated as well.As a result,the probability of overturning collapse caused by the tensile failure or compression shear failure of the bearings can be avoided.The isolation location installed at the middle of super stories is highly important as well.
A new concept that isolation devices installed at base and mid-story is applied to attenuate the seismic responses of high-rise building.A method to select the stiffness and damping parameters of each isolation layer is presented based on two-DOF simple model.And a numerical simulation on a twenty-story high-rise building controlled by segmented isolation system is carried out.Compared with the traditional base isolation structure,the lateral deformation of the base isolation layer is distributed to isolation layers of segmented isolation system,and the whiplash effect of the top building resulted by the high-order vibration modes can be attenuated as well.As a result,the probability of overturning collapse caused by the tensile failure or compression shear failure of the bearings can be avoided.The isolation location installed at the middle of super stories is highly important as well.
引文
[1]周福霖.工程结构减震控制[M].北京:地震出版社,1997
[2]Zhou Fulin.Progress of application and development inbase isolation and passive energy dissipation for civil andindustrial structures[C]//Proceedings of the InternationalPost-SMiRT Conference Seminar.Cheju,Korea,1999:31-40
[3]程华群,刘伟庆,王曙光.高层隔震建筑设计中隔震支座受拉问题分析[J].地震工程与工程振动,2007,27(4):161-166(ChengHuaqun,Liu Weiqing,Wang Shuguang.Analysis of the tension of rubber bearings in the design ofisolated high-rise buildings[J].Journal of EarthquakeEngineering and Engineering Vibration,2007,27(4):161-166(in Chinese))
[4]Spencer B F,Johnson E A,Ramallo J C.Smart isolation forseismic contro[lJ].JSME International Journal,2000,43(3):704-711
[5]谭平,闫维明,周福霖.大平台多塔楼新型隔震体系的智能磁流变控制[J].工程抗震与加固,2007,29(3):41-47(Tan Ping,Yan Weiming,Zhou Fulin.Smart controlfor a new seismic isolation system of multi-tower structureon a large platform using MR dampers[J].EarthquakeResistant Engineering and Retrofitting,2007,29(3):41-47(in Chinese))
[2]Zhou Fulin.Progress of application and development inbase isolation and passive energy dissipation for civil andindustrial structures[C]//Proceedings of the InternationalPost-SMiRT Conference Seminar.Cheju,Korea,1999:31-40
[3]程华群,刘伟庆,王曙光.高层隔震建筑设计中隔震支座受拉问题分析[J].地震工程与工程振动,2007,27(4):161-166(ChengHuaqun,Liu Weiqing,Wang Shuguang.Analysis of the tension of rubber bearings in the design ofisolated high-rise buildings[J].Journal of EarthquakeEngineering and Engineering Vibration,2007,27(4):161-166(in Chinese))
[4]Spencer B F,Johnson E A,Ramallo J C.Smart isolation forseismic contro[lJ].JSME International Journal,2000,43(3):704-711
[5]谭平,闫维明,周福霖.大平台多塔楼新型隔震体系的智能磁流变控制[J].工程抗震与加固,2007,29(3):41-47(Tan Ping,Yan Weiming,Zhou Fulin.Smart controlfor a new seismic isolation system of multi-tower structureon a large platform using MR dampers[J].EarthquakeResistant Engineering and Retrofitting,2007,29(3):41-47(in Chinese))
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