Effects of concrete heterogeneity on FRP-concrete bond behaviour: Experimental and mesoscale numerical studies

Li，Ya Qi1; Chen，Jian Fei2; Yang，Zhen Jun1; Esmaeeli，Esmaeel3; Sha，Wei4; Huang，Yu Jie1

2021-11-01

10.1016/j.compstruct.2021.114436

COMPOSITE STRUCTURES   影响因子和分区

0263-8223

1879-1085

Extensive experimental and numerical studies have been conducted to understand the bond behaviour of FRP-concrete interfaces with the assumption of homogenous materials. This study is aimed at a better understanding of the effects of concrete heterogeneity on the FRP-concrete bond behaviour, by a combination of experiments and mesoscale numerical modelling. FRP-concrete and FRP-mortar bonded joints were tested using a four-point bending setup. The crack initiation and propagation process with interfacial debonding until failure was accurately captured by the digital image correlation (DIC) technique. The results show that the presence of coarse aggregates in the FRP-concrete joints leads to 19% higher bond strength, but much higher variations in the bond strength and the strain distribution across the width of FRP sheets, than the FRP-mortar joints. Monte Carlo simulations of mesoscale finite element models with random distribution of polygonal aggregates were then carried out for the FRP-concrete bond tests. It is found that the distribution of coarse aggregates significantly affects the overall force–deflection responses as well as the simulated fracture processes and final failure modes that are highly comparable with the DIC observations.

Concrete Debonding Fiber reinforced polymer (FRP) Finite element model Meso-scale modelling

SCI ; EI

英语

其他

National Natural Science Foundation of China["51974202","51779222"] ; Key Research and Development Programme of Hubei Province[2020BAB052] ; SinoGerman Center for Research Promotion[M0172]

Mechanics ; Materials Science

Mechanics ; Materials Science, Composites

WOS:000708080800009

ELSEVIER SCI LTD

20213510832032

Bond strength (materials) ; Concrete aggregates ; Debonding ; Fiber reinforced plastics ; Intelligent systems ; Monte Carlo methods ; Mortar ; Reinforced concrete

Concrete:412 ; Mortar (Before 1993, use code 412):414.3 ; Artificial Intelligence:723.4 ; Numerical Methods:921.6 ; Mathematical Statistics:922.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85113666519

Scopus

1.Hubei Key Lab of Geotechnical and Structural Safety,School of Civil Engineering,Wuhan University,430072,China
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,518000,China
3.Department of Civil and Environmental Engineering,Brunel University London,UB8 3PH,United Kingdom
4.School of Natural and Built Environment,Queen's University Belfast,BT9 5AG,United Kingdom

Li，Ya Qi,Chen，Jian Fei,Yang，Zhen Jun,et al. Effects of concrete heterogeneity on FRP-concrete bond behaviour: Experimental and mesoscale numerical studies[J]. COMPOSITE STRUCTURES,2021,275.

Li，Ya Qi,Chen，Jian Fei,Yang，Zhen Jun,Esmaeeli，Esmaeel,Sha，Wei,&Huang，Yu Jie.(2021).Effects of concrete heterogeneity on FRP-concrete bond behaviour: Experimental and mesoscale numerical studies.COMPOSITE STRUCTURES,275.

Li，Ya Qi,et al."Effects of concrete heterogeneity on FRP-concrete bond behaviour: Experimental and mesoscale numerical studies".COMPOSITE STRUCTURES 275(2021).