Response and modeling of axially-loaded concrete-filled steel columns with recycled coarse and fine aggregate

Mu Zi Zhao; Yu Yin Wang; Dawn E. Lehman; Yue Geng; Charles W. Roeder

doi:10.1016/j.engstruct.2020.111733

Response and modeling of axially-loaded concrete-filled steel columns with recycled coarse and fine aggregate

Mu Zi Zhao
, Yu Yin Wang^*
, Dawn E. Lehman
, Yue Geng
, Charles W. Roeder

^*Corresponding author for this work

School of Civil Engineering

Harbin Institute of Technology
School of Civil Engineering, Harbin Institute of Technology
University of Washington

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

Recycled aggregate concrete-filled steel tube (RACFST) could be a practical structural application of recycled aggregate concrete (RAC) with fine recycled aggregate (FRA). Despite its great potential, limited attention has been devoted to the compressive response of RACFST with FRA. This study investigates the effects of FRA on the structural response of RACFST with different coarse recycled aggregate (CRA) replacement ratios (r_C), and how FRA influences the confinement effect of RACFST. Fifty-four RACFST specimens were tested to failure with different FRA and CRA replacement ratios (r_F and r_C), concrete strengths (f_cm) and effective steel ratios (α). Experimental results show that FRA and CRA have a significant compounding effect (i.e., FRA effect is different at varying r_C) on the strain at the maximum load (ε₀) of RACFST. Unlike CRA which has an insignificant influence on the confinement effect, the use of FRA significantly reduces the confinement of RACFST. The test results were used to modify the existing mathematical expressions for normal concrete-filled steel tube (CFST) to predict the stress-strain relationships for RACFST. The predicted results matches well with the available test data.

Original language	English
Article number	111733
Journal	Engineering Structures
Volume	234
DOIs	https://doi.org/10.1016/j.engstruct.2020.111733
State	Published - 1 May 2021

Keywords

Coarse recycled aggregate
Compounding effect
Concrete filled steel tube
Confinement effects
Fine recycled aggregate
Recycled aggregate concrete

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10.1016/j.engstruct.2020.111733

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title = "Response and modeling of axially-loaded concrete-filled steel columns with recycled coarse and fine aggregate",

abstract = "Recycled aggregate concrete-filled steel tube (RACFST) could be a practical structural application of recycled aggregate concrete (RAC) with fine recycled aggregate (FRA). Despite its great potential, limited attention has been devoted to the compressive response of RACFST with FRA. This study investigates the effects of FRA on the structural response of RACFST with different coarse recycled aggregate (CRA) replacement ratios (rC), and how FRA influences the confinement effect of RACFST. Fifty-four RACFST specimens were tested to failure with different FRA and CRA replacement ratios (rF and rC), concrete strengths (fcm) and effective steel ratios (α). Experimental results show that FRA and CRA have a significant compounding effect (i.e., FRA effect is different at varying rC) on the strain at the maximum load (ε0) of RACFST. Unlike CRA which has an insignificant influence on the confinement effect, the use of FRA significantly reduces the confinement of RACFST. The test results were used to modify the existing mathematical expressions for normal concrete-filled steel tube (CFST) to predict the stress-strain relationships for RACFST. The predicted results matches well with the available test data.",

keywords = "Coarse recycled aggregate, Compounding effect, Concrete filled steel tube, Confinement effects, Fine recycled aggregate, Recycled aggregate concrete",

author = "Zhao, \{Mu Zi\} and Wang, \{Yu Yin\} and Lehman, \{Dawn E.\} and Yue Geng and Roeder, \{Charles W.\}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = may,

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doi = "10.1016/j.engstruct.2020.111733",

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AU - Zhao, Mu Zi

AU - Wang, Yu Yin

AU - Lehman, Dawn E.

AU - Geng, Yue

AU - Roeder, Charles W.

PY - 2021/5/1

Y1 - 2021/5/1

N2 - Recycled aggregate concrete-filled steel tube (RACFST) could be a practical structural application of recycled aggregate concrete (RAC) with fine recycled aggregate (FRA). Despite its great potential, limited attention has been devoted to the compressive response of RACFST with FRA. This study investigates the effects of FRA on the structural response of RACFST with different coarse recycled aggregate (CRA) replacement ratios (rC), and how FRA influences the confinement effect of RACFST. Fifty-four RACFST specimens were tested to failure with different FRA and CRA replacement ratios (rF and rC), concrete strengths (fcm) and effective steel ratios (α). Experimental results show that FRA and CRA have a significant compounding effect (i.e., FRA effect is different at varying rC) on the strain at the maximum load (ε0) of RACFST. Unlike CRA which has an insignificant influence on the confinement effect, the use of FRA significantly reduces the confinement of RACFST. The test results were used to modify the existing mathematical expressions for normal concrete-filled steel tube (CFST) to predict the stress-strain relationships for RACFST. The predicted results matches well with the available test data.

AB - Recycled aggregate concrete-filled steel tube (RACFST) could be a practical structural application of recycled aggregate concrete (RAC) with fine recycled aggregate (FRA). Despite its great potential, limited attention has been devoted to the compressive response of RACFST with FRA. This study investigates the effects of FRA on the structural response of RACFST with different coarse recycled aggregate (CRA) replacement ratios (rC), and how FRA influences the confinement effect of RACFST. Fifty-four RACFST specimens were tested to failure with different FRA and CRA replacement ratios (rF and rC), concrete strengths (fcm) and effective steel ratios (α). Experimental results show that FRA and CRA have a significant compounding effect (i.e., FRA effect is different at varying rC) on the strain at the maximum load (ε0) of RACFST. Unlike CRA which has an insignificant influence on the confinement effect, the use of FRA significantly reduces the confinement of RACFST. The test results were used to modify the existing mathematical expressions for normal concrete-filled steel tube (CFST) to predict the stress-strain relationships for RACFST. The predicted results matches well with the available test data.

KW - Coarse recycled aggregate

KW - Compounding effect

KW - Concrete filled steel tube

KW - Confinement effects

KW - Fine recycled aggregate

KW - Recycled aggregate concrete

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DO - 10.1016/j.engstruct.2020.111733

M3 - 文章

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SN - 0141-0296

VL - 234

JO - Engineering Structures

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ER -

Response and modeling of axially-loaded concrete-filled steel columns with recycled coarse and fine aggregate

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