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建筑物隔震构造主要用于削弱地基中地震荷载对上部结构的影响,而来自上部的飞机撞击对于安全壳隔震体系的影响如何是保证核电安全值得探讨的重要问题。为评价核电站安全壳隔震体系与飞机撞击的耦合动力效应,该文提供了一种细致的模拟耦合动力分析的手段,建立了安全壳细致的动力数值模型,针对不同刚度的隔震支座及无隔震条件,进行多种类型飞机撞击作用下安全壳的动力响应分析。结果显示,飞机撞击作用期间,不同刚度的隔震支座与无隔震条件相比,撞击位置中心节点位移与冲击力的大小具有相关性,因而存在差异,而对于安全壳混凝土结构损伤区域分布则差异不大;但在撞击荷载作用后,不同刚度的隔震支座则会对安全壳振动衰减过程有较大影响。研究表明在隔震体系设计阶段,不能片面的考虑隔震体系在削弱地震响应方面的需求,需要与飞机撞击振动衰减过程耦合分析,从而确定适宜的隔震支座水平刚度等参数。
The isolation structure of the building is mainly used to weaken the influence of the seismic load on the superstructure in the foundation. How the impact of the aircraft impact from the upper part on the isolation system of the containment is an important issue worthy of study to ensure the safety of nuclear power. In order to evaluate the coupled dynamic effect of the isolated system of the containment and the impact of the aircraft, this paper provides a meticulous method to simulate the coupled dynamic analysis and establishes a detailed dynamic numerical model of the containment. Based on the seismic isolation support with different stiffness and Without isolation conditions, the dynamic response of containment under various types of aircraft impact is analyzed. The results show that there is a difference between the displacement of center node of impact location and the magnitude of impact when compared with that of non-isolated seismic isolation bearing with different stiffness during aircraft impact. Therefore, the distribution of damage area in concrete containment But the difference is insignificant; However, after the impact load, the isolation bearings with different stiffness will have a greater impact on the vibration attenuation process of the containment. The research shows that in the design stage of isolation system, the demand of isolation system to weaken the seismic response can not be considered unilaterally. Coupling analysis with the process of aircraft crash vibration attenuation should be carried out to determine the appropriate parameters such as horizontal stiffness of isolation bearings.