Structural behavior of CFRP-strengthened steel beams at different service temperatures: Experimental study and FE modeling

Dong Guo; Hua-Ping Wang; Yun-Lin Liu; Wan-Yang Gao; Jian-Guo Dai

doi:10.1016/j.engstruct.2023.116646

Structural behavior of CFRP-strengthened steel beams at different service temperatures: Experimental study and FE modeling

Dong Guo
, Hua-Ping Wang
, Yun-Lin Liu
, Wan-Yang Gao^*
, Jian-Guo Dai^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

37 Citations (Scopus)

Abstract

The structural performance of externally bonded carbon fiber-reinforced polymer (CFRP)-strengthened steel beams can be affected by different service temperatures. This study carried out three-point bending tests on thirteen beams, including two un-strengthened steel beams and eleven CFRP-strengthened steel beams, at temperatures ranging from −20 °C to 60 °C. CFRP plates with two different lengths (i.e., 300 mm and 600 mm) were used for the strengthening. The load–deflection curves, ultimate failure loads and the strain evolutions in CFRP plates were measured and compared. The results showed that the steel beams strengthened with 300 mm CFRP plates were failed due to plate-end debonding at all temperatures, and the debonding load decreased with the temperature increase. In contrast, the steel beams strengthened with 600 mm CFRP plates were failed due to CFRP rupture at −20 °C to 45 °C but plate-end debonding at 60 °C. A finite element (FE) model was proposed for predicting the experimental results, in which the temperature-dependent interfacial bond behavior was properly considered based on the results from the previous CFRP-to-steel double-lap shear tests. The FE model was extensively validated through the comparisons between the experimental and FE results of load–displacement curves and CFRP strain distributions at various load levels. © 2023 Elsevier Ltd

Original language	English
Article number	116646
Journal	Engineering Structures
Volume	293
Online published	23 Jul 2023
DOIs	https://doi.org/10.1016/j.engstruct.2023.116646
Publication status	Published - 15 Oct 2023
Externally published	Yes

Funding

The authors are grateful for the financial support received from the Hong Kong Research Grants Council - Theme-based Research Scheme (Project No: T22-5-2/18-R), the National Natural Science Foundation of China (NSFC) (Project Nos: 51478406 , 51978398 and 52178278 ), the Natural Science Foundation of Shanghai, China (No. 23ZR1429200 ), the Research Grants Council of the Hong Kong SAR (Project No: 15219919 ), the Department of Education of Guangdong Province, China (Project No. 2021KCXTD030 ), the National Foreign Expert Project of China (Project Nos: DL2021175003L and G2021175026L ), and for a Ph.D. studentship awarded to the first author by The Hong Kong Polytechnic University.

Research Keywords

Bond-slip behavior
CFRP
Plate-end debonding
Steel beam
Strengthening
Temperature variation

RGC Funding Information

RGC-funded

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10.1016/j.engstruct.2023.116646

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title = "Structural behavior of CFRP-strengthened steel beams at different service temperatures: Experimental study and FE modeling",

abstract = "The structural performance of externally bonded carbon fiber-reinforced polymer (CFRP)-strengthened steel beams can be affected by different service temperatures. This study carried out three-point bending tests on thirteen beams, including two un-strengthened steel beams and eleven CFRP-strengthened steel beams, at temperatures ranging from −20 °C to 60 °C. CFRP plates with two different lengths (i.e., 300 mm and 600 mm) were used for the strengthening. The load–deflection curves, ultimate failure loads and the strain evolutions in CFRP plates were measured and compared. The results showed that the steel beams strengthened with 300 mm CFRP plates were failed due to plate-end debonding at all temperatures, and the debonding load decreased with the temperature increase. In contrast, the steel beams strengthened with 600 mm CFRP plates were failed due to CFRP rupture at −20 °C to 45 °C but plate-end debonding at 60 °C. A finite element (FE) model was proposed for predicting the experimental results, in which the temperature-dependent interfacial bond behavior was properly considered based on the results from the previous CFRP-to-steel double-lap shear tests. The FE model was extensively validated through the comparisons between the experimental and FE results of load–displacement curves and CFRP strain distributions at various load levels. {\textcopyright} 2023 Elsevier Ltd",

keywords = "Bond-slip behavior, CFRP, Plate-end debonding, Steel beam, Strengthening, Temperature variation",

author = "Dong Guo and Hua-Ping Wang and Yun-Lin Liu and Wan-Yang Gao and Jian-Guo Dai",

year = "2023",

month = oct,

day = "15",

doi = "10.1016/j.engstruct.2023.116646",

language = "English",

volume = "293",

journal = "Engineering Structures",

issn = "0141-0296",

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TY - JOUR

T1 - Structural behavior of CFRP-strengthened steel beams at different service temperatures

T2 - Experimental study and FE modeling

AU - Guo, Dong

AU - Wang, Hua-Ping

AU - Liu, Yun-Lin

AU - Gao, Wan-Yang

AU - Dai, Jian-Guo

PY - 2023/10/15

Y1 - 2023/10/15

N2 - The structural performance of externally bonded carbon fiber-reinforced polymer (CFRP)-strengthened steel beams can be affected by different service temperatures. This study carried out three-point bending tests on thirteen beams, including two un-strengthened steel beams and eleven CFRP-strengthened steel beams, at temperatures ranging from −20 °C to 60 °C. CFRP plates with two different lengths (i.e., 300 mm and 600 mm) were used for the strengthening. The load–deflection curves, ultimate failure loads and the strain evolutions in CFRP plates were measured and compared. The results showed that the steel beams strengthened with 300 mm CFRP plates were failed due to plate-end debonding at all temperatures, and the debonding load decreased with the temperature increase. In contrast, the steel beams strengthened with 600 mm CFRP plates were failed due to CFRP rupture at −20 °C to 45 °C but plate-end debonding at 60 °C. A finite element (FE) model was proposed for predicting the experimental results, in which the temperature-dependent interfacial bond behavior was properly considered based on the results from the previous CFRP-to-steel double-lap shear tests. The FE model was extensively validated through the comparisons between the experimental and FE results of load–displacement curves and CFRP strain distributions at various load levels. © 2023 Elsevier Ltd

AB - The structural performance of externally bonded carbon fiber-reinforced polymer (CFRP)-strengthened steel beams can be affected by different service temperatures. This study carried out three-point bending tests on thirteen beams, including two un-strengthened steel beams and eleven CFRP-strengthened steel beams, at temperatures ranging from −20 °C to 60 °C. CFRP plates with two different lengths (i.e., 300 mm and 600 mm) were used for the strengthening. The load–deflection curves, ultimate failure loads and the strain evolutions in CFRP plates were measured and compared. The results showed that the steel beams strengthened with 300 mm CFRP plates were failed due to plate-end debonding at all temperatures, and the debonding load decreased with the temperature increase. In contrast, the steel beams strengthened with 600 mm CFRP plates were failed due to CFRP rupture at −20 °C to 45 °C but plate-end debonding at 60 °C. A finite element (FE) model was proposed for predicting the experimental results, in which the temperature-dependent interfacial bond behavior was properly considered based on the results from the previous CFRP-to-steel double-lap shear tests. The FE model was extensively validated through the comparisons between the experimental and FE results of load–displacement curves and CFRP strain distributions at various load levels. © 2023 Elsevier Ltd

KW - Bond-slip behavior

KW - CFRP

KW - Plate-end debonding

KW - Steel beam

KW - Strengthening

KW - Temperature variation

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DO - 10.1016/j.engstruct.2023.116646

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85165515989

SN - 0141-0296

VL - 293

JO - Engineering Structures

JF - Engineering Structures

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ER -

Structural behavior of CFRP-strengthened steel beams at different service temperatures: Experimental study and FE modeling

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Research Keywords

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