不同连接构造的预制拼装钢管混凝土桥墩数值模拟与地震响应特点

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Abstract The presented paper investigates the seismic performance of prefabricated concrete filled steel tube (CFT) columns with two typical column-footing connections: socket connection (SC) and hybrid connection (HC). Finite element models for both SC and HC columns were established in OpenSees software. The SC model is able to simulate the bond-slip between the embedded steel tube and its surrounding concrete, the local buckling and the tearing; while the HC model can simulate the rocking behavior at the column-footing interface. The effectiveness of both models was validated through previous experimental data. Then analyses were conducted to investigate the dynamic performance of a 4-span continuous bridge with the single-column piers with the HC, SC and post-tensioned SC connections, respectively. The results show that both the SC and post-tensioned SC columns experience steel tube buckling when peak ground acceleration (PGA) reaches about 0.4g, resulting in a reduction in the horizontal stiffness and an increase in the residual displacement. Moreover, the damage caused by steel tube buckling in the post-tensioned SC columns is more severe, and with the further increase of PGA, the self-centering capacity provided by the post-tensioning gradually becomes evident. When the PGA reaches 0.6g, the residual drift of post-tensioned SC column is only 62% of that in the SC column. The HC column sustains less damage under strong earthquake excitations, with the residual drift less than 0.2%. Thus, it has better self-centering capacity than both the SC connection columns.

Key words： bridge engineering concrete filled steel tube column socket connection hybrid connection finite element model seismic behavior.

Received: 25 May 2023 Published: 15 April 2024

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	Articles by authors
	CHEN Tingdi1
	WANG Shengbin2
	FENG Keyan3
	LI Jianzhong1

Cite this article:

CHEN Tingdi1,WANG Shengbin2,FENG Keyan3, et al. Numerical simulation and seismic response characteristics of prefabricated assembled concrete filled steel tube columns with different connection constructions[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 134-143.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I7/134

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