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为了解决单一常系数弹簧-阻尼器并联系统表征的场地动力模型无法反映无限域场地的动刚度和阻尼是随激振频率变化的函数,也无法反映非均质场地条件影响的问题,从谐响应动力求解方法的基本概念出发,以粘弹性场地动力模型为分析对象,推导了一种适于非均质场地条件的随激振频率变化的核电厂地基动阻抗数值的求解方法,并分别以二维和三维算例的形式给出了该方法和传统抗震设计规范集总参数模型结果、经典解的比较。结果表明:采用该方法计算的动阻抗满足工程精度要求且能表征出地基动阻抗是随激励频率改变而变化的。
In order to solve the dynamical model of the site characterized by a single constant coefficient spring-damper parallel system, it can not reflect the dynamic stiffness and damping of the infinite field as a function of the variation of the exciting frequency and also can not reflect the influence of the heterogeneous site conditions. Based on the basic concept of dynamic solution method and the dynamic model of viscoelastic field, the numerical method for solving the dynamic impedance of foundation of a nuclear power plant with varying excitation frequency is derived. In the form of three-dimensional and three-dimensional examples, the results of the lumped parameter model and the classical solutions are given. The results show that the dynamic impedance calculated by this method meets the requirement of engineering accuracy and can be used to characterize that the dynamic impedance of foundation varies with the excitation frequency.