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地基—非线性结构相互作用空间效应的动力学行为研究
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摘要
中文摘要
    本文应用非线性动力学理论研究了弹性地基-多自由度非线性结构相
    互作用体系非线性耦合运动中的内共振问题,主要内容如下:
    1.采用非对称结构的恢复力为双线性模型,地基土则简化为集中参
    数模型,建立了无质量基础的地基-结构空间相互作用模型,利用能量
    法得到了结构水平侧移和扭转位移相耦合的振动方程,为以下的分析建
    立了基础。
    2.用多尺度法对上面建立的方程进行分析,得到了体系发生内共振
    的条件,通过算例讨论了水平刚度与扭转刚度成某一关系时的振动特性
    与能量传递,并且利用数值分析方法得到了体系发生主共振时的数值解,
    将其与摄动解进行了比较。
    3.采用多尺度法进行研究,得到了体系在强激励下产生超谐和亚谐
    共振的条件,分析了体系处于超谐和亚谐共振时的非线性动力学行为,
    并且把多尺度法求得的摄动解同数值解进行了比较。
    本文通过非线性动力学理论提示了 SSI 非线性耦合体系不同于线性耦
    合体系的主共振以及超谐和亚谐共振现象,得到了一些有益的结论,为
    结构抗震(振)分析与结构破坏预测提供了更为深刻的理论依据。
In this paper,the nonlinear dynamical theories are used to study the
    internal resonance of the elastic foundation-multiple degree nonlinear
    structure interaction system under the nonlinear coupling of horizontal
    oscillation and torsion oscillation.The work of this paper are as follows:
     1. A bilinear stiffness model is taken as a restoring force of the
    unsymmetrical structure,and a lumped parameter model is used to simulate
    the viscoelastic halfspace,then the massless foundation- soil-structure
    interaction model considering spatial effect is established.The Lagrange
    energy equation is used to build the nonlinear coupling equation of
    horizontal motion and torsion motion and the following research is based on
    the equation.
     2. Perturbation analysis are used to analyze the above equation,the
    situations of the internal resonance are obtained. Through the analyses of
    numerical examples,the vibration characteristics and energy transfer
    behavior are discussed while some relation lies in the horizontal stiffness
    and the torsion stiffness.And the numerical analysis is carried out.The
    perturbation solutions and numerical solutions are compared.
     3. Perturbation analysis are used to analyze situations of superharmonic
    resonance and subharmonic resonance under strong excitation.The nonlinear
    dynamical behavior of superharmonic resonance and subharmonic resonance
    is studied.The perturbation solutions and numerical solutions are compared.
     Primary resonance and superharmonic resonance and subharmonic
    resonance of nonlinear coupling system are studied,which are different from
    linear coupling system.Some helpful conclusions are obtained, and these
    can provide more profound theoretic reference for the earthquake(vibration)
    resistant design and analysis.
引文
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