【摘要】 文章将周期结构原理与导纳方法结合起来,分析了带复合结构单元的有阻尼的有限周期系统的波传播和振动特性,得到了有限周期结构自振频率的一般表达式。特别地将多层房屋结构简化为带集中质量的有限周期柱模型,分析了在水平地震力作用下的基础隔震结构的振动功率流,并比较了有限周期柱模型与刚体质量块模型的基础隔震传递率。文章指出,基础隔震系统能有效地延长建筑物的自振周期,减少振动功率流的传递,隔震系统的阻尼能有效地降低结构的共振反应。更多还原

【Abstract】 This paper describes the wave propagation and vibration characteristics of mono-coupled structures which are of spatially periodic nature; particular emphasis is laid on studying finite damped periodic systems with composite structural elements. The receptance approach to periodic structure theory is applied to study thd vibrational power flow of a base-isolated multi-storey building due to horizontal ground motion. Numerical results indicate the influence of the building impedance the properties of the isolator and the fundamental vibration frequency of the system. It has been pointed out that a finite periodic column with concentrated masses model for a building can be used to provide further insight into the vibrational characteristics of a multi-storey building.更多还原