假定每层刚心沿层间变化不大,质心与刚心的偏心距在一个方向上较小。这样把一般的建筑结构转化为具有层间剪切刚度Ki,扭转刚度K　i的力学模型。设结构的层数为n,每层集中质量为Mj和Ji,质心相对于刚心的x方向坐标为xi(i=1,2,…,n),于是有下述自由振动方程:式中 厂为y向水位移向 Assume that the centerline of each layer varies little between layers, and the eccentricity between the center of mass and the center of the ball is small in one direction. This translates the general building structure into a mechanical model with interlaminar shear stiffness Ki and torsional stiffness K i . Let the number of layers of the structure be n, the mass of each layer be Mj and Ji, and the x-direction coordinate of the center of mass relative to the rigid heart is xi(i=1,2,...,n), then there is the following free vibration equation: Factory for y to water displacement