The new Structural Seismic Isolation System (SSIS) intends to provide high safety for important structures such as nuclear power plants, offshore oil platforms, and high-rise buildings against near-fault and long-period earthquakes. The presented SSIS structure foot base and foundation contact surfaces have been designed as any curved surfaces (spherical, elliptical, etc.) depending on the earthquake-soil-superstructure parameters, and these contact surfaces have been separated by using elastomeric (lead core rubber or laminated rubber bearings with up to 4-second period) seismic isolation devices. It would allow providing inverse pendulum behavior to the structure. As a result of this behavior, the natural period of the structure will possess greater intervals which are larger than the predominant period of the majority of the possible earthquakes including near-fault zones. Consequently, the structure can maintain its serviceability after the occurrence of strong and long-period earthquakes. This study has investigated the performance of the SSIS for the nuclear containment (SSIS-NC) structure. The finite element model of SISS-NC structure has been developed, and nonlinear dynamic analysis of the model has been conducted under the strong and long-period ground motions. The results have been presented in comparison with the conventional application method of the seismic base isolation devices for nuclear containment (CAMSBID-NC) and fixed base nuclear containment (FB-NC) structures. The base and top accelerations, effective stress, and critical shear stress responses of the SSIS-NC structure are 48.67%, 36.70%, and 32.60% on average lower than those of CAMSBID-NC structure, respectively. The result also confirms that the SSIS-NC structure did not cause resonant vibrations under long-period earthquakes. On the other hand, there is excessive deformation in the isolation layers of CAMSBID-NC structure.

中文翻译：

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核安全壳结构的新结构地震隔离

新的结构地震隔离系统（SSIS）旨在为重要结构（例如核电站，海上石油平台和高层建筑物）提供高安全性，以抵御近断层和长期地震。根据地震土壤上层建筑的参数，提出的SSIS结构脚底和地基的接触面已设计为任何曲面（球形，椭圆形等），并且这些接触面已使用弹性体（铅芯橡胶或叠层橡胶轴承，具有长达4秒钟的振动隔离装置。这将允许向结构提供反向摆的行为。由于这种行为，结构的自然周期将具有更大的间隔，该间隔大于包括附近断层带在内的大多数可能发生的地震的主要周期。因此，在发生强而长时期的地震后，该结构可以保持其可使用性。这项研究调查了SSIS在核安全壳（SSIS-NC）结构上的性能。建立了SISS-NC结构的有限元模型，并在强，长周期地震动下对该模型进行了非线性动力学分析。与传统的核安全隔震装置（CAMSBID-NC）和固定基础核安全装置（FB-NC）结构的常规应用方法相比，已给出了结果。基本和最高加速度，有效应力，SSIS-NC结构的临界剪切应力响应分别比CAMSBID-NC结构的平均剪切应力响应分别降低48.67％，36.70％和32.60％。结果还证实，在长时间地震下，SSIS-NC结构不会引起共振。另一方面，CAMSBID-NC结构的隔离层中会产生过度的变形。