具有隔震构造的安全壳飞机撞击耦合动力响应模拟分析

DYNAMIC RESPONSE ANALYSIS OF THE ISOLATED NUCLEAR CONTAINMENT UNDER COUPLING AIRCRAFT CRASH LOADS

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 building isolation structure is mainly used to weaken the influence of the earthquake on the superstructure. The upper impact, from the aircraft crash on the containment with the isolation system, is also an important issue to ensure the safety of nuclear power station. In order to evaluate the coupling dynamic effect of the isolation system and aircraft crash, a detailed dynamic numerical model of the containment has been established in the paper. Moreover, dynamic response analysis of the containment suffering three different types of aircraft crash is carried out under the conditions of three different isolation bearings and non-isolation. The results show that some changes occur to the displacement of the center node at the impact position which is related to the magnitude of the impact force during the period of aircraft crash. While the distribution of damage area has little change. However, the stiffness of the vibration isolation bearings has great impact on the containment-vibration-attenuation process after the impact load of aircraft. Based on this study, in the stage of isolation system design, it is essential to consider the isolation performance of isolated system as well as the influence of the aircraft impact to determine the appropriate parameters of vibration isolation bearings.