某核岛结构地震动力响应试验的数值模拟研究

NUMERICAL SIMULATION OF SEISMIC RESPONSE EXPERIMENT OF A NUCLEAR-ISLAND BUILDING

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。

Relying on the seismic response experiment of a nuclear-island building,finite element model was established to simulate the experimental model,whose floor response spectrum were calculated using sub-structure method which was widely used in seismic analysis of nuclear-island buildings. And comparison was performed between numerical simulation and experiment,which was focused on the dominant frequency and other dynamic characteristics of experimental model,and also the tendency of floor response spectra,zero period acceleration,peak acceleration etc. Also the influence on seismic dynamic response between considering the sloshing effect of water in the tank at the top of building or not was studied using numerical simulation methods. The study indicated that the result of numerical simulation agreed well with experiment one; the widely used sub-structure method in seismic analysis of nuclear-island buildings was mature and reliable,which could simulate the real seismic response of nuclear-island building,and its result was partial to safety; the water tank on the top of nuclear-island building could decrease its seismic response in a certain degree.