耦合地震动下地铁车站的动力响应研究

耦合地震动对地铁车站结构的响应较为复杂,本文运用有限单元法进行动力时程分析,研究地铁车站结构承受水平、竖向和双向耦合地震动作用下的动力响应规律。结果表明:(1)耦合地震动对结构相对水平位移影响较小,但对结构的相对竖向位移影响较大。(2)耦合地震动会减小中柱主应力值,但并未较大程度上改变中柱主应力值大小分布情况。(3)车站中柱底部和各节点位置在单向以及耦合地震动中都为结构的薄弱位置,需要在抗震设计中着重注意。

Dynamic Response Research on Subway Stations under Coupled Ground Motion

The response of subway station structure under coupled ground motion is complex. This paper uses a finite element method for dynamic response research. Dynamic response of the subway station structure was analyzed under the horizontal, vertical, and bi-directional coupled ground motion. Results showed that:(1) Coupled ground motion has little effect on the relative horizontal displacement of the structure, but has a large effect on the relative vertical displacement of the structure. (2) Coupled ground motion can decrease the principal stress of the middle column, but cannot change the distribution of principal stress of the middle column to a large extent. (3) The bottom of the middle columns and joints of the station are weak positions under unidirectional and coupled ground motion, which require more attention in seismic design.