This study aims to better understand the seismic responses and isolation effect of a first-story, independent, column-top isolation structure with concrete frames. A series of shaking table tests and a numerical simulation were performed on a seven-story reinforced concrete–framed structure with first-story isolation, using rubber bearings. A non-isolated, structural model was used as a reference for comparison. The testing and numerical results showed that the story acceleration and inter-story displacement of the superstructure in the isolation model were significantly reduced, indicating the good damping effect of the isolation system. This system, which composed of rubber bearings, could absorb most of the seismic energy. The inter-story displacement of the substructure in the isolation model was also significantly reduced, while the acceleration was slightly reduced. The horizontal deformation of the column was not severe, and the seismic capacity of the substructure was higher than that of the superstructure. It is suggested that to guarantee the seismic security of reinforced concrete–framed structures with the first-story column-top isolation under extremely rare strong earthquakes, the stiffness of columns in the substructure should be further strengthened. Moreover, it is effective and reasonable to adopt the first-story column-top isolation method to improve the seismic capacity of reinforced concrete–framed structures with a weak first story.

中文翻译：

---

一楼独立柱钢筋混凝土框架建筑的地震响应分析

本研究旨在更好地了解具有混凝土框架的一层独立柱顶隔震结构的地震反应和隔震效果。一系列振动台试验和数值模拟是在一个七层钢筋混凝土框架结构上进行的，第一层隔震，使用橡胶支座。一个非隔离的结构模型被用作比较的参考。测试和数值结果表明，隔震模型中上部结构的楼层加速度和层间位移显着降低，表明隔震系统的阻尼效果良好。该系统由橡胶支座组成，可以吸收大部分地震能量。隔离模型中下部结构的层间位移也显着减少，而加速度略有降低。柱体水平变形不严重，下部结构抗震能力高于上部结构。建议为保证一级柱顶隔震钢筋混凝土框架结构在极罕见强震下的抗震安全，应进一步加强下部结构柱的刚度。此外，采用首层柱顶隔震方法提高首层弱钢筋混凝土框架结构的抗震能力是有效合理的。建议为保证一级柱顶隔震钢筋混凝土框架结构在极罕见强震下的抗震安全，应进一步加强下部结构柱的刚度。此外，采用首层柱顶隔震方法提高首层弱钢筋混凝土框架结构的抗震能力是有效合理的。建议为保证一级柱顶隔震钢筋混凝土框架结构在极罕见强震下的抗震安全，应进一步加强下部结构柱的刚度。此外，采用首层柱顶隔震方法提高首层弱钢筋混凝土框架结构的抗震能力是有效合理的。