摘要
近断层地震较远场地震具有显著的脉冲效应、上下盘效应和破裂方向效应,对结构有强大的破坏作用。本文采用ANSYS有限元软件模拟了4层钢筋混凝土(RC)框架非隔震和隔震结构,分析其在近断层水平地震单独作用和水平、竖向地震共同作用下的动力响应。研究表明,结构在水平、竖向地震共同作用下的层间位移和顶层加速度反应较水平地震单独作用下的反应要大,并且在近断层脉冲地震作用下竖向地震对隔震结构的影响大于对非隔震结构的影响,因而,进行近断层地震作用下的抗震分析时应考虑竖向地震作用。
Compared with the far-field ground motions, the near-fauh ground motions have the pulse effect, the hanging wall effect and the rupture directivity effect, which do great damage to the structures. The ANSYS finite element analysis software is used to simulate the four-storey fixed-base structure and the four-storey base-isolation structure and study the dynamic response under the horizontal component, the horizontal and vertical component of near-fauh ground motions. The result shows that the inner-story displacement and the acceleration of the top story under the horizontal and vertical component are larger than the horizontal component of the near-fault ground motions, the influence of the vertical component to the base-isolation structure is greater than the fixed-base structure under the near-fauh pulse ground motions. The vertical component must be considered under the seismic analysis.
出处
《工程抗震与加固改造》
北大核心
2014年第4期36-43,共8页
Earthquake Resistant Engineering and Retrofitting
关键词
近断层地震
竖向地震
隔震结构
脉冲效应
远场地震
near-fauh ground motion
the vertical seismic
base-isolation structure
pulse effect
far-field ground motion
