多维近断层地震对RC框架结构抗震性能的影响  

Seismic Performance Assessment of RC Frame Structure Subjected to Multiple Near-fault Ground Motions

作　　者：陈艳[1] 

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《工程抗震与加固改造》2014年第4期36-43,共8页Earthquake Resistant Engineering and Retrofitting

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.

关 键 词：近断层地震 竖向地震 隔震结构 脉冲效应 远场地震 

分 类 号：TU352.12[建筑科学—结构工程]