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  4. Cyclic behavior of concrete-filled tube columns with bidirectional moment connections considering the local slenderness effect
 
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Cyclic behavior of concrete-filled tube columns with bidirectional moment connections considering the local slenderness effect
Dr. Núñez-Castellanos, Eduardo 
Facultad de Ingeniería 
Mata-Lemus, Ramón
Facultad de Ingeniería 
10.3390/buildings14072240
10.3390/buildings15050670
MDPI
2024
In this research, the cyclic behavior of concrete-filled thin tube (CFTT) columns with bidirectional moment connections was numerically studied within the context of thin-walled structures. Novel considerations in the design of CFTT columns with slenderness sections are proposed through a parametric study. A total of 70 high-fidelity finite element (FE) models are developed using ANSYS software v2022 calibrated from experimental research using similar 3D joint configurations. Furthermore, a comparison of different width-to-thickness ratios in columns was considered. The results showed that the models with a high slenderness ratio reached a stable cyclic behavior until 0.03 rad of drift, and a flexural strength of 0.8 Mp was reached for 4% of the drift ratio according to the Seismic Provisions. However, this effect slightly decreased the strength and the dissipated energy of the moment connection in comparison to columns with a high ductility ratio. Moreover, an evaluation of concrete damages shows concrete cracked for cyclic loads higher than 3% of drift. Finally, the joint configurations studied can achieve a good performance, avoiding brittle failure mechanisms and ensuring the plastic hinges in the beams.
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Steel moment connection
Bidirectional effect
Cyclic behavior
CFTT columns
Finite element method
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