长周期地震动脉冲特性对RC框架结构响应的影响研究
王 博,杨 柯,刘伯权,吴 涛

(长安大学 建筑工程学院,陕西 西安 710061)

长周期地震动; 高层框架结构; 脉冲特性; 简化等效模型; 弹塑性地震响应

Study on the influences of pulse characteristics for long-period ground motions on the response of RC frame structure
WANG Bo, YANG Ke,LIU Boquan,WU Tao

(School of Civil Engineering, Chang'an University, Xi'an 710061, China)

long-period ground motion; high-rise frame structure; pulse characteristic; simplified equivalent model; elastic-plastic seismic response

DOI: 10.15986j.1006-7930.2019.04.011

备注

建立远场类谐和地震动、近断层向前方向性地震动和近断层滑冲型地震动的简化等效模型,以某12层RC框架结构为例,分析研究长周期地震动脉冲特性对结构地震响应的影响.结果表明:结构上部的层间剪力均随脉冲周期的增大而减小,脉冲周期对结构下部楼层剪力的影响规律不明显; 楼层位移随脉冲周期的增大而增大; 最大层间位移角所在楼层位置随脉冲周期的增大趋于下移; 在远场类谐和地震动作用下的结构最大位移响应大于相同脉冲周期下的其他两种长周期地震动; 结构最大层间位移角随远场类谐和地震动脉冲持时的增大而趋于增大,但其所在楼层位置不变.

The simplified equivalent models for far-field harmonic-like ground motion, near-fault forward-directivity ground motion and near-fault fling-step ground motion were established, and the influence of pulse characteristics on the elastic-plastic seismic responses were analysed based on one 12-layer RC frame structure. Results show that the floor shear for the superstructure decreases with the increase of pulse period, while the influence law of pulse period on the structural base shear is not obvious. The floor displacement increases with the increas of pulse period; the floor location of maximum interstory drift ratio moves down with the increasing of pulse period. The maximum displacement responses under far-field harmonic-like ground motion are larger than those under two other types of long-period ground motions with the same pulse period. and the maximum interstory drift ratio has the increasing trend with the increasing of pulse duration, but the floor location remains unchanged.