Experimental and numerical investigations on the behaviour of concrete filled steel tube and channel shear connectors in push-out tests

Abstract This paper presents experimental and theoretical analysis of bolts employed as shear connectors in circular concrete-filled steel tube columns (CFTs). The theoretical results, obtained from ABNT NBR 16239:2013 formulations, were compared with the experimental results. A series of push-out tests were carried out, where the diameter and length of the bolts, the number of connectors and the concrete strength were varied. From the experimental results, it was observed that the equations from ABNT NBR 16239:2013 are conservative. Therefore, it is proposed an adjustment to the formulations in order to consider the concrete confinement. It was also verified that increments in the diameter and the length of the bolt increase the load capacity of the connector. However, the variation of the quantity of bolts and the concrete strength did not interfere in the load capacity.

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Study on push-out test and bond stress-slip relationship of circular concrete filled steel tube

Steel and Composite Structures ◽

10.12989/scs.2010.10.4.317 ◽

2010 ◽

Vol 10 (4) ◽

pp. 317-329 ◽

Cited By ~ 5

Author(s):

Xiaowei Yin ◽

Xilin Lu

Keyword(s):

Steel Tube ◽

Bond Stress ◽

Concrete Filled Steel Tube ◽

Relationship Of ◽

Push Out

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Seismic Behavior of Concrete-Filled Steel Tube (CFST) Column and Reinforced Concrete (RC) Beam Connections under Reversed Cyclic Loading

Journal of Engineering and Technological Sciences ◽

10.5614/j.eng.technol.sci.2021.53.3.1 ◽

2021 ◽

Vol 53 (3) ◽

pp. 210301

Author(s):

Ahmed Najm Abdullah ◽

Bambang Budiono ◽

Herlien Dwiarti Setio ◽

Erwin Lim

Keyword(s):

Reinforced Concrete ◽

Steel Tube ◽

Experimental Results ◽

Fe Model ◽

Rc Beam ◽

Concrete Filled Steel Tube ◽

Shear Connectors ◽

Smooth Interface ◽

Connection System ◽

Cfst Columns

Previous studies on the connection between concrete-filled steel tube (CFST) columns and reinforced concrete (RC) beams have shown a loss of joint confinement because the steel tube was completely or partially cut in the joint area. This research presents a new connection system that provides joint confinement through a continuous steel tube. Potential sliding shear at the smooth interface between the columns and beams in the joint face is mitigated using two mechanisms: (i) shear connectors and (ii) longitudinal web beam reinforcement. This study tested two CFST column and RC beam joints to 4.5% drift ratio under combined compression axial load and lateral cyclic load. The experimental results revealed no cracks at the joint zone and the specimens satisfied the ACI 374.1-05 criteria, despite minor sliding at the beam-column interface. The finite element (FE) model showed good agreement with the experimental results.

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