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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

36卷

期数:

2019年04期

页码:

94-101

栏目:

出版日期:

2019-07-25

文章信息/Info

Title:

Influence of Effective Peak of Far-field Long-period Ground Motion on Elastoplastic Response of High-rise RC Frame Structures

文章编号:

1673-2049(2019)04-0094-08

作者:

王 博,李 哲,吴 涛,刘伯权

(长安大学 建筑工程学院,陕西 西安 710061)

Author(s):

WANG Bo, LI Zhe, WU Tao, LIU Bo-quan

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

关键词:

长周期地震动;  高层结构;  有效峰值;  经验模态分解;  弹塑性时程分析

Keywords:

long-period ground motion;  high-rise structure;  effective peak;  empirical mode decomposition;  elasto-plastic time-history analysis

分类号:

TU313

DOI:

-

文献标志码:

A

摘要:

为研究远场长周期地震动对高层结构地震响应的影响机理,分别选取10条长周期地震动与10条普通地震动,并根据中国现行抗震设计规范设计某高层RC框架结构,采用ABAQUS软件建立有限元模型进行计算分析。首先,对比分析长周期地震动与普通地震动作用下的结构响应特征; 然后,基于经验模态分解(EMD),将长周期地震动分解为包含不同频域信息的本征模态函数(IMF)分量,并依次去掉各IMF分量后将剩余分量叠加重构成新的地震动,通过对比每条新地震动与原始地震动作用下的结构响应,分析各IMF分量对结构弹塑性地震响应的影响程度。结果表明:长周期地震动作用下高层结构的各地震响应均大于普通地震动; 与结构自振周期接近且峰值较大的IMF分量对地震响应影响较大,第1个高频IMF分量具有降低结构响应的有利干扰作用; 长周期地震动的有效峰值和有效峰值率显著大于普通地震动,从而初步揭示了长周期地震动作用下高层结构的地震响应大于普通地震动的内在机理。

Abstract:

In order to investigate the influence mechanism of the far-field long-period ground motions(LPGMs)on the seismic responses to high-rise structures, 10 LPGMs and ordinary ground motions were selected respectively, and a high-rise RC frame structure was designed according to the current seismic design code of China. Meanwhile, the finite element model of the high-rise RC frame structure was established by ABAQUS software for calculation and analysis. Firstly, the structural response characteristics under the long-period ground motions(LPGMs)and ordinary ground motions were compared. Then, the LPGMs were decomposed into different intrinsic mode functions(IMFs)with different frequency information based on empirical mode decomposition(EMD). Each IMF component was taken out and the residual IMFs were added to reconstruct the new ground motions. Through the comparison of the structural responses between the original LPGM and the new ground motions, the influence degree of the IMF on the structural response was investigated. The results show that the seismic response of high-rise structures under LPGMs is larger than those under ordinary ground motion. The IMF components, which is close to the structural natural vibration period and has a larger peak value, has a greater impact on the seismic response, and the first high-frequency IMF component has the favorable interference effect of reducing structural response. The effective peak value and effective peak rate of LPGMs are significantly larger than those of ordinary ground motion, thus the internal mechanism that the seismic responses of high-rise structures under LPGMs are larger than those under ordinary ground motions is preliminarily revealed.

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相似文献/References:

[1]赵国辉,郭华东,刘健新.长周期地震动作用下大跨径斜拉桥响应分析[J].建筑科学与工程学报,2015,32(01):89.
　ZHAO Guo-hui,GUO Hua-dong,LIU Jian-xin.Analysis on Response of Long Span Cable-stayed Bridge Under Long-period Ground Motion[J].Journal of Architecture and Civil Engineering,2015,32(04):89.

备注/Memo

备注/Memo:

收稿日期:2018-10-28
基金项目:国家自然科学基金项目(51708037); 陕西省自然科学基础研究计划项目(2018JQ5078); 中国博士后科学基金项目(2017M610616); 陕西省博士后科研资助项目(2017BSHEDZZ111); 西安市科技计划项目(201805045YD23CG29(6)); 中央高校基本科研业务费专项资金项目(300102288111)
作者简介:王 博(1985-),男,河南南阳人,副教授,工学博士,博士后,E-mail:chnwan

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更新日期/Last Update: 2019-07-26