Confinement of ultra-high-performance fiber reinforced concrete columns

Confinement of ultra-high-performance fiber reinforced concrete columns. Shin, H., Min, K., & Mitchell, D. Composite Structures, 176:124 - 142, 2017. Confinement model;Confinement reinforcement;High strength concretes;Stress-strain relationships;Transverse confinement;Transverse reinforcement;Ultra high strength concretes;Ultra-high-performance fiber-reinforced concrete;

Paper abstract bibtex

This study investigates the axial load response of ultra-high-performance fiber-reinforced concrete (UHPFRC) columns with compressive strengths of 163 and 181 MPa (design strengths of 150 and 180 MPa). The UHPFRC used in this study had 1.5% of hybrid micro-steel fibers (1.0% of 19.5 mm fibers and 0.5% of 16.3 mm fibers) and did not contain coarse aggregate. A total of nine UHPFRC columns confined by transverse reinforcement with volumetric ratios of 0.9–9.9% and two different configurations (Types A and C) were tested under pure axial load to investigate the influence of these variables. The overall behavior of the UHPFRC columns was compared with the response of similar strength ultra-high-strength concrete (UHSC) columns having coarse aggregate. Test results showed a pronounced effect of the volumetric ratio of the transverse reinforcement on the confinement. Hybrid micro-steel fibers controlled brittle cover spalling very well and assisted the transverse confinement reinforcement after the peak load. Applicability of the confinement reinforcement equations in the current seismic design provisions for developing ductile behavior of the UHPFRC columns was investigated. The analytical study examined the ability of the existing high-strength concrete (HSC) confinement models for predicting the axial load response of the UHPFRC columns, and a prediction model that accounts for the effects of steel fibers and the stress-strain relationship of UHPFRC is proposed.
© 2017 Elsevier Ltd

@article{20172103686830 ,
language = {English},
copyright = {Compilation and indexing terms, Copyright 2023 Elsevier Inc.},
copyright = {Compendex},
title = {Confinement of ultra-high-performance fiber reinforced concrete columns},
journal = {Composite Structures},
author = {Shin, Hyun-Oh and Min, Kyung-Hwan and Mitchell, Denis},
volume = {176},
year = {2017},
pages = {124 - 142},
issn = {02638223},
abstract = {This study investigates the axial load response of ultra-high-performance fiber-reinforced concrete (UHPFRC) columns with compressive strengths of 163 and 181&nbsp;MPa (design strengths of 150 and 180&nbsp;MPa). The UHPFRC used in this study had 1.5% of hybrid micro-steel fibers (1.0% of 19.5&nbsp;mm fibers and 0.5% of 16.3&nbsp;mm fibers) and did not contain coarse aggregate. A total of nine UHPFRC columns confined by transverse reinforcement with volumetric ratios of 0.9&ndash;9.9% and two different configurations (Types A and C) were tested under pure axial load to investigate the influence of these variables. The overall behavior of the UHPFRC columns was compared with the response of similar strength ultra-high-strength concrete (UHSC) columns having coarse aggregate. Test results showed a pronounced effect of the volumetric ratio of the transverse reinforcement on the confinement. Hybrid micro-steel fibers controlled brittle cover spalling very well and assisted the transverse confinement reinforcement after the peak load. Applicability of the confinement reinforcement equations in the current seismic design provisions for developing ductile behavior of the UHPFRC columns was investigated. The analytical study examined the ability of the existing high-strength concrete (HSC) confinement models for predicting the axial load response of the UHPFRC columns, and a prediction model that accounts for the effects of steel fibers and the stress-strain relationship of UHPFRC is proposed.<br/> &copy; 2017 Elsevier Ltd},
key = {Axial loads},
keywords = {Compressive strength;Steel fibers;Stress-strain curves;Columns (structural);Reinforced concrete;Seismic design;High performance concrete;Concrete aggregates;Fiber reinforced materials;},
note = {Confinement model;Confinement reinforcement;High strength concretes;Stress-strain relationships;Transverse confinement;Transverse reinforcement;Ultra high strength concretes;Ultra-high-performance fiber-reinforced concrete;},
URL = {http://dx.doi.org/10.1016/j.compstruct.2017.05.022},
}

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The UHPFRC used in this study had 1.5% of hybrid micro-steel fibers (1.0% of 19.5 mm fibers and 0.5% of 16.3 mm fibers) and did not contain coarse aggregate. A total of nine UHPFRC columns confined by transverse reinforcement with volumetric ratios of 0.9–9.9% and two different configurations (Types A and C) were tested under pure axial load to investigate the influence of these variables. The overall behavior of the UHPFRC columns was compared with the response of similar strength ultra-high-strength concrete (UHSC) columns having coarse aggregate. Test results showed a pronounced effect of the volumetric ratio of the transverse reinforcement on the confinement. Hybrid micro-steel fibers controlled brittle cover spalling very well and assisted the transverse confinement reinforcement after the peak load. Applicability of the confinement reinforcement equations in the current seismic design provisions for developing ductile behavior of the UHPFRC columns was investigated. 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