In order to investigate the seismic responses of a polar crane at a nuclear power station, a 1:16 scaled model (C_L = 16) which uses the same material as the prototype, is designed. The similarity constants between the prototype and model are derived based on similarity criteria and different experimental aims. In order to ensure similarity in gravity and ignore similarity in stress, the similarity ratio of time between the prototype and model must be C_t = 16^1/2. To ensure similarity in stress and ignore the gravity field (self-weight), the similarity ratio of time must be C_t = 16. Similarities in gravity and stress cannot be ensured simultaneously. The correctness of derived similarity constants is validated by numerical methods. The experiment results show the eigen-frequency and damping ratio of the scaled model, investigate dynamic response characteristics of the model and magnify characteristics of acceleration and response spectrum at polar girder elevation, by comparing with input earthquake loads at shaking table. The different similarity ratios of time of experimental models can induce different dynamical responses of the polar crane, even if the acceleration similarity ratios for C_t = 4 and C_t = 16 are all equal to 1. Different similarity ratios of time of experimental models change the frequency characteristics of earthquake inputs on the shaking table.

为了在一个核电站调查极性起重机的地震响应，1:16比例模型（ç_大号 = 16），其使用相同的材料为原型，被设计。原型和模型之间的相似性常数是根据相似性标准和不同的实验目的推导出来的。为了保证重力相似而忽略应力相似，原型与模型的时间相似比必须为C _t  = 16 ^1/2。为保证应力相似而忽略重力场（自重），时间相似比必须为C _t = 16. 不能同时确保重力和应力的相似性。通过数值方法验证了导出的相似常数的正确性。试验结果显示了比例模型的特征频率和阻尼比，研究了模型的动力响应特性，并通过与振动台输入地震载荷的比较，放大了极梁标高处的加速度和响应谱特性。即使C _t  = 4 和C _t的加速度相似比，实验模型的不同时间相似比也会引起极地起重机不同的动力响应 = 16 都等于1。不同的实验模型时间相似比改变了振动台上地震输入的频率特性。