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依托某核岛结构的地震动力响应试验,通过建立试验模型的有限元分析模型,采用目前核岛地震响应计算常用的空间子结构法计算分析该楼层的反应谱,并与地震动力响应试验的结果进行对比,主要研究试验模型的自振频率等动力特性及其楼层反应谱的趋势、零周期加速度、峰值加速度等。同时采用数值模拟技术对是否考虑顶部水箱中有、无水时核岛结构的地震动力响应进行对比。研究认为:有限元计算结果的趋势与地震动力响应试验结果吻合得较好;目前核电领域广泛采用空间子结构法进行抗震分析是成熟可靠的,能够反映结构真实的地震响应,并偏于安全;结构物顶部的水箱在盛水的情况下一定程度上起到了减振作用。
Based on the seismic dynamic response test of a nuclear island structure, the response spectrum of this floor is calculated and analyzed by using the finite element analysis model of the test model and the commonly used space substructure method for calculating the seismic response of the nuclear island at present. The results are compared with the results of the seismic dynamic response test Compared the dynamic characteristics of the experimental model such as the natural frequency and its floor response spectrum trends, zero-cycle acceleration, peak acceleration and so on. At the same time, the numerical simulation technique is used to compare whether the seismic response of the nuclear island structure with or without water in the top tank is considered. The research shows that the trend of FEM results agrees well with the experimental results of seismic dynamic response. At present, the widely used substructure method for seismic analysis in nuclear power field is mature and reliable, which can reflect the true seismic response of the structure and is biased towards safety. The tank at the top of the structure acts to a certain extent to dampen the water in the case of water.