Investigation of the effects of connectors to enhance bond strength of externally bonded steel plates and CFRP laminates with concrete

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Steel plates and carbon-fiber-reinforced polymer (CFRP) laminates or plates bonded to concrete substrates have been widely used for concrete strengthening. However, this technique cause plate debonding, which makes the strengthening system inefficient. The main objective of this study is to enhance the bond strength of externally bonded steel plates and CFRP laminates to the concrete surface by proposing new embedded adhesive and steel connectors. The effects of these new embedded connectors were investigated through the tests on 36 prism specimens. Parameters such as interfacial shear stress, fracture energy and the maximum strains in plates were also determined in this study and compared with the maximum value of debonding stresses using a relevant failure criterion by means of pullout test. The study indicates that the interfacial bond strength between the externally bonded plates and concrete can be increased remarkably by using these connectors. The investigation verifies that steel connectors increase the shear bond strength by 48% compared to 38% for the adhesive connectors. Thus, steel connectors are more effective than adhesive connectors in increasing shear bond strength. Results also show that the use of double connectors significantly increases interfacial shear stress and decrease debonding failure. Finally, a new proposed formula is modified to predict the maximum bond strength of steel plates and CFRP laminates adhesively glued to concrete in the presence of the embedded connectors.

Original languageEnglish
Pages (from-to)1275-1303
Number of pages29
JournalSteel and Composite Structures
Volume20
Issue number6
DOIs
Publication statusPublished - 30 Apr 2016

Fingerprint

Steel
Carbon fibers
Laminates
Polymers
Concretes
Debonding
Adhesives
Shear stress
Fracture energy
Bond strength (materials)
Strengthening (metal)
Prisms
carbon fiber
Substrates

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Metals and Alloys

Cite this

@article{02004d5dcc2b42e799dabf0386f585fd,
title = "Investigation of the effects of connectors to enhance bond strength of externally bonded steel plates and CFRP laminates with concrete",
abstract = "Steel plates and carbon-fiber-reinforced polymer (CFRP) laminates or plates bonded to concrete substrates have been widely used for concrete strengthening. However, this technique cause plate debonding, which makes the strengthening system inefficient. The main objective of this study is to enhance the bond strength of externally bonded steel plates and CFRP laminates to the concrete surface by proposing new embedded adhesive and steel connectors. The effects of these new embedded connectors were investigated through the tests on 36 prism specimens. Parameters such as interfacial shear stress, fracture energy and the maximum strains in plates were also determined in this study and compared with the maximum value of debonding stresses using a relevant failure criterion by means of pullout test. The study indicates that the interfacial bond strength between the externally bonded plates and concrete can be increased remarkably by using these connectors. The investigation verifies that steel connectors increase the shear bond strength by 48{\%} compared to 38{\%} for the adhesive connectors. Thus, steel connectors are more effective than adhesive connectors in increasing shear bond strength. Results also show that the use of double connectors significantly increases interfacial shear stress and decrease debonding failure. Finally, a new proposed formula is modified to predict the maximum bond strength of steel plates and CFRP laminates adhesively glued to concrete in the presence of the embedded connectors.",
author = "Jabbar, {Ali Sami Abdul} and Alam, {Md Ashraful} and Mustapha, {Kamal Nasharuddin}",
year = "2016",
month = "4",
day = "30",
doi = "10.12989/scs.2016.20.6.1275",
language = "English",
volume = "20",
pages = "1275--1303",
journal = "Steel and Composite Structures",
issn = "1229-9367",
publisher = "Techno Press",
number = "6",

}

TY - JOUR

T1 - Investigation of the effects of connectors to enhance bond strength of externally bonded steel plates and CFRP laminates with concrete

AU - Jabbar, Ali Sami Abdul

AU - Alam, Md Ashraful

AU - Mustapha, Kamal Nasharuddin

PY - 2016/4/30

Y1 - 2016/4/30

N2 - Steel plates and carbon-fiber-reinforced polymer (CFRP) laminates or plates bonded to concrete substrates have been widely used for concrete strengthening. However, this technique cause plate debonding, which makes the strengthening system inefficient. The main objective of this study is to enhance the bond strength of externally bonded steel plates and CFRP laminates to the concrete surface by proposing new embedded adhesive and steel connectors. The effects of these new embedded connectors were investigated through the tests on 36 prism specimens. Parameters such as interfacial shear stress, fracture energy and the maximum strains in plates were also determined in this study and compared with the maximum value of debonding stresses using a relevant failure criterion by means of pullout test. The study indicates that the interfacial bond strength between the externally bonded plates and concrete can be increased remarkably by using these connectors. The investigation verifies that steel connectors increase the shear bond strength by 48% compared to 38% for the adhesive connectors. Thus, steel connectors are more effective than adhesive connectors in increasing shear bond strength. Results also show that the use of double connectors significantly increases interfacial shear stress and decrease debonding failure. Finally, a new proposed formula is modified to predict the maximum bond strength of steel plates and CFRP laminates adhesively glued to concrete in the presence of the embedded connectors.

AB - Steel plates and carbon-fiber-reinforced polymer (CFRP) laminates or plates bonded to concrete substrates have been widely used for concrete strengthening. However, this technique cause plate debonding, which makes the strengthening system inefficient. The main objective of this study is to enhance the bond strength of externally bonded steel plates and CFRP laminates to the concrete surface by proposing new embedded adhesive and steel connectors. The effects of these new embedded connectors were investigated through the tests on 36 prism specimens. Parameters such as interfacial shear stress, fracture energy and the maximum strains in plates were also determined in this study and compared with the maximum value of debonding stresses using a relevant failure criterion by means of pullout test. The study indicates that the interfacial bond strength between the externally bonded plates and concrete can be increased remarkably by using these connectors. The investigation verifies that steel connectors increase the shear bond strength by 48% compared to 38% for the adhesive connectors. Thus, steel connectors are more effective than adhesive connectors in increasing shear bond strength. Results also show that the use of double connectors significantly increases interfacial shear stress and decrease debonding failure. Finally, a new proposed formula is modified to predict the maximum bond strength of steel plates and CFRP laminates adhesively glued to concrete in the presence of the embedded connectors.

UR - http://www.scopus.com/inward/record.url?scp=84964967725&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84964967725&partnerID=8YFLogxK

U2 - 10.12989/scs.2016.20.6.1275

DO - 10.12989/scs.2016.20.6.1275

M3 - Article

AN - SCOPUS:84964967725

VL - 20

SP - 1275

EP - 1303

JO - Steel and Composite Structures

JF - Steel and Composite Structures

SN - 1229-9367

IS - 6

ER -