Dynamic punching shear tests of flat slab-column joints with 5D steel fibers

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Title: Dynamic punching shear tests of flat slab-column joints with 5D steel fibers
Authors: Alvarado, Yezid A. | Torres, Benjamín | Buitrago, Manuel | Ruiz, Daniel M. | Torres, Sergio Y. | Álvarez, Ramón A.
Research Group/s: Grupo de Ensayo, Simulación y Modelización de Estructuras (GRESMES)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: 5D steel fiber | Cyclic load | Double hooked end steel fiber | Dynamic punching | Slab-column joint | Steel fiber reinforced concrete
Knowledge Area: Mecánica de Medios Contínuos y Teoría de Estructuras
Issue Date: 10-Feb-2022
Publisher: Techno-Press
Citation: Structural Engineering and Mechanics. 2022, 81(3): 281-292. https://doi.org/10.12989/sem.2022.81.3.281
Abstract: This study aimed to analyze the dynamic punching shear performance of slab-column joints under cyclic loads with the use of double-hooked end (5D) steel fibers. Structural systems such as slab-column joints are widely found in infrastructures. The susceptibility to collapse of such structures when submitted to seismic loads is highly dependent on the structural performance of the slab-column connections. For this reason, the punching capacity of reinforced concrete (RC) structures has been the subject of a great number of studies. Steel fibers are used to achieve a certain degree of ductility under seismic loads. In this context, 5D steel hooked fibers provide high levels of fiber anchoring, tensile strength and ductility. However, only limited research has been carried out on the performance under cyclic loads of concrete structural members containing steel fibers. This study covers this gap with experimental testing of five different full-scale subassemblies of RC slab-column joints: one without punching reinforcement, one with conventional punching reinforcement and three with 5D steel fibers. The subassemblies were tested under cyclic loading, which consisted of applying increasing lateral displacement cycles, such as in seismic situations, with a constant axial load on the column. This set of cycles was repeated for increasing axial loads on the column until failure. The results showed that 5D steel fiber subassemblies: i) had a greater capacity to dissipate energy, ii) improved punching shear strength and stiffness degradation under cyclic loads; and iii) increased cyclic loading capacity.
Sponsor: This work was financially supported by Cementos Argos, Colciencias and the Pontificia Universidad Javeriana de Bogotá (Colombia).
URI: http://hdl.handle.net/10045/121602
ISSN: 1225-4568 (Print) | 1598-6217 (Online)
DOI: 10.12989/sem.2022.81.3.281
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2022 Techno-Press, Ltd.
Peer Review: si
Publisher version: https://doi.org/10.12989/sem.2022.81.3.281
Appears in Collections:INV - GRESMES - Artículos de Revistas

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