In this paper, the seismic performance of a reinforced concrete (RC)-framed underground subway station structure which has three stories and three spans was analyzed firstly under strong earthquakes. It was found that the central columns in the top and the bottom stories were the weakest seismic components in this type of underground structure. Thus, lead-core rubber bearings (LRBs) were installed at the central column-tops of the structure, and the seismic performance of the underground station structure with LRBs was also studied. The results show that LRBs can reduce the seismic damage to the central columns and interior slabs and the lateral deformation of the central columns effectively. While the installation of LRBs will also change the internal force transfer characteristics and energy distribution of the large underground structure and increase the seismic damage to the top and bottom slabs and side walls to some extent. In particular, when LRBs were only set on the central column-tops in the top and bottom stories, which have the most unfavorable seismic performance in the underground structure, the seismic damage to the central columns without LRBs was significantly exacerbated. The isolation method of installing LRBs at the top of the central columns in each story was clearly superior and could ensure that the underground station structure would not collapse due to serious damage of the columns under strong earthquakes.

本文首先分析了三层三跨的钢筋混凝土地下地铁车站的抗震性能。结果发现，上下两层的中心柱是这种地下结构中最弱的地震成分。因此，铅芯橡胶轴承（LRB）安装在结构的中央柱顶，并且还研究了带有LRB的地下车站结构的抗震性能。结果表明，LRB可以有效地减少对中柱和内板的地震破坏以及中柱的横向变形。同时，LRB的安装还将改变大型地下结构的内力传递特性和能量分布，并在一定程度上增加对顶部和底部平板以及侧壁的地震破坏。特别是，当仅在顶部和底部楼层的中央立柱顶部设置LRB时，地下结构中的抗震性能最差，那么没有LRB的中央立柱的地震破坏会大大加剧。在每个楼层的中央立柱顶部安装LRB的隔离方法显然是优越的，并且可以确保地下车站结构不会在强烈地震下由于立柱的严重损坏而倒塌。当LRB仅设置在地下结构中具有最不利地震性能的顶部和底部楼层的中央柱顶部时，对没有LRB的中央柱的地震破坏会大大加剧。在每个楼层的中央立柱顶部安装LRB的隔离方法显然是优越的，并且可以确保地下车站结构不会在强烈地震下由于立柱的严重损坏而倒塌。当LRB仅设置在地下结构中具有最不利地震性能的顶部和底部楼层的中央柱顶部时，对没有LRB的中央柱的地震破坏会大大加剧。在每个楼层的中央立柱顶部安装LRB的隔离方法显然是优越的，并且可以确保地下车站结构不会在强烈地震下由于立柱的严重损坏而倒塌。