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众所周知,为了确定作用在房屋或构筑物上的地震和惯性力,当采用地震反应谱理论计算的时候,必需预先算出房屋或构筑物的自振周期(频率)和振型。这个问题的解,可由结构动力学方法来获得,而为了尽可能的和更合理的利用电子计算机,亦可运用建筑力学的矩阵方法。至于说房屋或构筑物单位位移矩阵的组成,只要能全面地描述具有若干个自由度的弹性体系分离体的计算简图就行了。
It is well known that in order to determine earthquakes and inertial forces acting on a house or a structure, it is necessary to precalculate the natural vibration period (frequency) and mode shape of the house or structure when using seismic response spectrum theory calculations. The solution to this problem can be obtained by the structural dynamics method. In order to use the electronic computer as much as possible and more rationally, the matrix method of building mechanics can also be used. As for the composition of the displacement matrix of a house or a structure, it is sufficient to describe the calculation diagram of a separate elastic body with several degrees of freedom.