|Table of Contents|

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

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

Issue:
2019年04期
Page:
94-101
Research Field:
Publishing date:

Info

Title:
Influence of Effective Peak of Far-field Long-period Ground Motion on Elastoplastic Response of High-rise RC Frame Structures
Author(s):
WANG Bo;  LI Zhe;  WU Tao;  LIU Bo-quan
(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
long-period ground motion;  high-rise structure;  effective peak;  empirical mode decomposition;  elasto-plastic time-history analysis
PACS:
TU313
DOI:
-
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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Last Update: 2019-07-26