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基础隔震,作为减少建筑物地震作用的有效手段,正愈来愈引起国内外地震工程界人士的关注。虽然文献[1,2]对单自由度隔振体系进行过讨论,但对发生空间运动的基础隔震建筑物体系的理论研究文献却很少看到。为了深入研究基础隔震建筑物,必须建立该隔震体系的运动方程。为此,本文采用运动基座上微幅振动刚体作为该隔震体系的力学模型,利用动力学定理导出其运动方程,并在一定条件下使运动方程解耦。 1 运动方程的建立
Base isolation, as an effective means to reduce the earthquake effect of buildings, is increasingly attracting the attention of earthquake engineering circles at home and abroad. Although the literature [1, 2] discusses the single-degree-of-freedom vibration isolation system, the theoretical research literature on the base-isolated building system where spatial motion occurs is rarely seen. In order to thoroughly study the base-isolated buildings, the equation of motion of the earthquake-isolation system must be established. Therefore, in this paper, the micro-vibration rigid body on the motion base is used as the mechanical model of the earthquake-isolation system. The kinetic theorem is used to derive its motion equation and the motion equation is decoupled under certain conditions. 1 The establishment of the equation of motion