Numerical simulation and seismic response characteristics of prefabricated assembled concrete filled steel tube columns with different connection constructions
CHEN Tingdi1, WANG Shengbin2, FENG Keyan3, LI Jianzhong1
Numerical simulation and seismic response characteristics of prefabricated assembled concrete filled steel tube columns with different connection constructions
CHEN Tingdi1, WANG Shengbin2, FENG Keyan3, LI Jianzhong1
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1. State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
2. Anhui Transport Consulting & Design Institute Co., Ltd., Hefei 231262, China;
3. Tianjin Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300392, China
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Received
Revised
Published
2023-05-25
2023-08-18
2024-04-15
Issue Date
2024-04-15
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.
CHEN Tingdi1, WANG Shengbin2, FENG Keyan3, LI Jianzhong1.
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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