长周期地震动对SRC框架-RC核心筒混合结构协同工作的影响

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Abstract Due to the abundance of low-frequency components in far-field long-period ground motions (FLPGMs), long-period structures, such as high-rise buildings, are susceptible to severe damage. The steel reinforced concrete (SRC) frame-reinforced concrete (RC) core wall hybrid structure is a kind of dual structural system widely used in regions with high seismic intensity. Ensuring its cooperative work is the key to realizing multiple seismic fortification lines and reasonable structural failure modes under severe earthquakes. In this paper, the influence of FLPGMs on the cooperative work of SRC frame-RC core wall hybrid structures is clarified by comparing it with that under conventional ground motions (CGMs). Its internal mechanism is preliminarily revealed based on the structural dynamic analysis model under harmonic excitation and empirical mode decomposition (EMD). The calculated examples show that the frame shear and overturning moment sharing ratios under FLPGMs are significantly greater than those under CGMs. The floor with the maximum frame shear sharing ratio is lower than that under CGMs. When the PGA of FLPGMs increases to 400 gal, the frame shear and overturning moment sharing ratios of the SRC frames exceed 40% and 70%, respectively. It will be difficult to ensure the seismic safety of SRC frame-RC core wall hybrid structures designed by the current code under FLPGMs. The influence of excitation frequency on the cooperative work of structures is related to the participation of vibration modes. Structural responses under low-frequency excitation (with a period of 0.5-2.0 times the structural period) are dominated by the lower mode. The predominant IMF component of FLPGMs is the cause of the increased frame shear shearing ratio.

Key words： far-field long-period ground motions SRC frame-RC core wall hybrid structure cooperative work shear distribution Hilbert-Huang transform

Received: 17 May 2023 Published: 28 June 2024

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	YANG Ke
	WANG Bo
	ZHU Chao
	LIU Boquan
	LI Hong

Cite this article:

YANG Ke,WANG Bo,ZHU Chao, et al. Influence of long-period ground motions on the cooperative work of SRC frame-RC core wall hybrid structures[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(12): 36-45.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I12/36

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