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单层厂房抗震和动力计算中,常需计算基本周期,通常以平面排架的基本周期乘调整系数作为厂房的基本周期。平面排架的基本周期,各文献中介绍有采用频率方程和能量法求解的公式。当用能量法时,一般都取结构体系在其上的主要质量的(本身重量)作用下,产生的静力变位曲线作为振动曲线y(x)。为了使计算简化,本文取排架在单位力作用下产生的变位曲线,作为基本振型曲线求解排架的基本周期。如文献[3]指出的,假定的y(x)曲线偏差对结构周期值的影响并不灵敏,故取单位力作用下的变位
In the calculation of the earthquake resistance and dynamics of a single storey building, the basic cycle is often calculated. Usually, the basic cycle of the plane rack is multiplied by the adjustment factor as the basic cycle of the factory building. The basic cycle of plane racks is described in the literature using equations for frequency equations and energy methods. When the energy method is used, the static displacement curve produced by the main mass of the structural system on its own (in its own weight) is generally used as the vibration curve y(x). In order to simplify the calculation, this paper takes the displacement curve generated by the unit under the action of the unit force, and uses the basic mode shape curve to solve the basic cycle of the rack. As pointed out in [3], the deviation of the assumed y(x) curve is not sensitive to the influence of the period value of the structure, so the displacement under the action of the unit force is taken.