远场长周期地震动作用下高层框剪结构地震反应分析

发布时间：2018-03-02 23:14

本文选题：远场长周期地震动　切入点：普通地震动　出处：《科学技术与工程》2017年29期 　论文类型：期刊论文

【摘要】：选取3条远场长周期地震动和2条普通地震动,在比较其能量特性的基础上,采用ETABS软件建立两栋高层框剪结构的有限元模型。对比研究了地震动类型和结构基本周期对结构弹性地震反应的影响规律。结果表明:远场长周期地震动对高层框剪结构的地震反应具有放大作用;在其作用下结构的层间剪力、楼层位移和层间位移角明显大于普通地震动作用下的结果。远场地震动作用下结构的最大层间位移角出现在中下部楼层,且明显超出现行规范1/800的限值要求。普通地震动作用下结构的最大层间位移角出现在中上部楼层,能够满足规范限值要求。随着结构基本周期的增加,远场长周期地震动作用下结构的地震反应随之增大;普通地震动作用下结构的基底剪力、顶层位移逐渐增大;最大层间位移角略有下降、出现的楼层明显上移;顶层位移对长周期地震动、结构基本周期最为敏感。建议在高层结构抗震设计时进行远场长周期地震动作用下结构的抗震性能验算;且将结构位移作为重要的控制指标。
[Abstract]:Three far-field long-period ground motions and two ordinary ground motions were selected, and their energy characteristics were compared. The finite element model of two tall frame-shear structures is established by using ETABS software. The effects of the type of ground motion and the basic period of the structure on the elastic seismic response of the structure are compared and studied. The results show that the long-period ground motion in the far field affects the tall building. The seismic response of frame shear structure is magnified. The interstory shear force, floor displacement and interstory displacement angle of the structure under its action are obviously larger than those under ordinary ground motion. The maximum interstory displacement angle of the structure under the action of far-field ground motion appears in the middle and lower floors. The maximum interstory displacement angle of the structure under the action of ordinary ground motion appears in the upper middle floor, which can meet the limit requirement of the code. With the increase of the basic period of the structure, the maximum interstory displacement angle of the structure appears in the upper and middle floor under the action of ordinary ground motion. The seismic response of the structure increases under the action of the far-field long-period ground motion, the base shear force of the structure increases gradually under the action of the ordinary ground motion, the displacement of the top floor increases gradually, the maximum interstory displacement angle decreases slightly, and the floor moves up obviously. The displacement of the top floor is most sensitive to the long-period ground motion, and the basic period of the structure is the most sensitive. It is suggested that the seismic behavior of the structure under the action of the far-field long-period ground motion should be checked in the seismic design of the high-rise structure, and the displacement of the structure should be regarded as an important control index.
【作者单位】：宿迁学院建筑工程学院;西安建筑科技大学土木工程学院;江苏华晟建筑设计有限公司;
【基金】：国家自然科学基金(51478381) 江苏省高校自然科学研究项目(14KJB560016) 江苏高校“青蓝工程”优秀青年骨干教师项目资助
【分类号】：TU973.31

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