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New shear transfer system for concrete‐filled steel tube (CFST) columns

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Title: New shear transfer system for concrete‐filled steel tube (CFST) columns
Authors: Soltanalipour, Milad, Ferrer Ballester, Miquel, Marimón Carvajal, Federico, Albareda Valls, Albert, Casafont Ribera, Miguel, Iglesias Torquero, Gorka
Contributors: Universitat Politècnica de Catalunya. Doctorat en Anàlisi Estructural, Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria, Universitat Politècnica de Catalunya. Departament de Tecnologia de l'Arquitectura, Universitat Politècnica de Catalunya. REMM - Recerca en Estructures i Mecànica de Materials, Universitat Politècnica de Catalunya. DiCEA - Disseny i càlcul d'estructures arquitectòniques
Source: UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Publisher Information: Wiley, 2022.
Publication Year: 2022
Subject Terms: Tubes, Steel, shear transfer, Àrees temàtiques de la UPC::Edificació::Materials de construcció::Materials metàl·lics de construcció, Tubes, Steel, 02 engineering and technology, concrete-filled steel tube, CFST, composite column, Formigó--Revestiments, 0201 civil engineering
Description: Concrete‐filled steel tube (CFST) columns are frequently used in construction due to their high ductility and improved loadbearing capacities. At beam‐to‐CFST column joints, gusset plates are welded to the outer face of the steel tube, and specific elements should ensure the shear transfer between the inner face of the steel tube and the concrete core. The current shear transfer systems are shear studs, internal rings, angles, steel plates, steel bars, tab stiffeners, etc. Although good, these systems also have disadvantages, such as slowing down the construction process, complexity of execution, greater material consumption and restricting the flow when pumping the concrete into the tube. UPCCFST is a new connection system that enhances the shear bond strength of CFST columns and consists of punching the steel tube inwards to produce crown‐shaped protrusions that act as shear connectors. This system also speeds up the construction process, simplifies connections, does not restrict the flow when casting the concrete and has economic and environmental advantages. Push‐out tests were performed to evaluate the shear bond strength. The shear strength improvement using UPCCFST has been compared with the reference conventional CFST columns. The new system increased the shear bond strength by up to 6.67 times for the SHS 200x4 specimens and 2.89 times for the SHS 110x2 specimens. This paper explains the UPCCFST system, the prototyping process, the testing and the most important results and observations.
Document Type: Article
File Description: application/pdf
Language: English
ISSN: 1867-0539
1867-0520
DOI: 10.1002/stco.202100046
Rights: CC BY NC ND
Accession Number: edsair.doi.dedup.....d2b4413befa36ac09c745ebab3bb1381
Database: OpenAIRE
Description
Abstract:Concrete‐filled steel tube (CFST) columns are frequently used in construction due to their high ductility and improved loadbearing capacities. At beam‐to‐CFST column joints, gusset plates are welded to the outer face of the steel tube, and specific elements should ensure the shear transfer between the inner face of the steel tube and the concrete core. The current shear transfer systems are shear studs, internal rings, angles, steel plates, steel bars, tab stiffeners, etc. Although good, these systems also have disadvantages, such as slowing down the construction process, complexity of execution, greater material consumption and restricting the flow when pumping the concrete into the tube. UPCCFST is a new connection system that enhances the shear bond strength of CFST columns and consists of punching the steel tube inwards to produce crown‐shaped protrusions that act as shear connectors. This system also speeds up the construction process, simplifies connections, does not restrict the flow when casting the concrete and has economic and environmental advantages. Push‐out tests were performed to evaluate the shear bond strength. The shear strength improvement using UPCCFST has been compared with the reference conventional CFST columns. The new system increased the shear bond strength by up to 6.67 times for the SHS 200x4 specimens and 2.89 times for the SHS 110x2 specimens. This paper explains the UPCCFST system, the prototyping process, the testing and the most important results and observations.
ISSN:18670539
18670520
DOI:10.1002/stco.202100046