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. 2019 May 8;12(9):1495.
doi: 10.3390/ma12091495.

Effects of Adhesive Bond-Slip Behavior on the Capacity of Innovative FRP Retrofits for Fatigue and Fracture Repair of Hydraulic Steel Structures

Christine M Lozano  1 , Guillermo A Riveros  2
Affiliations

Effects of Adhesive Bond-Slip Behavior on the Capacity of Innovative FRP Retrofits for Fatigue and Fracture Repair of Hydraulic Steel Structures

Christine M Lozano et al. Materials (Basel). .

Abstract

Over eighty percent of the navigation steel structures (NSS) in the United States have highly deteriorated design boundary conditions, resulting in overloads that cause fatigue cracking. The NSSs' highly corrosive environment and deterioration of the protective system accelerate the fatigue cracking and cause standard crack repair methods to become ineffective. Numerous studies have assessed and demonstrated the use of carbon fiber reinforced polymers (CFRP) to rehabilitate aging and deteriorated reinforced concrete infrastructure in the aerospace industry. Due to the increase of fatigue and fracture failures of NSS and the shortage of research on CFRP retrofits for submerged steel structures, it is imperative to conduct research on the effects of CFRP repairs on NSS, specifically on the adhesive's chemical bonding to the steel substrate. This was accomplished by developing a new analytical algorithm for CFRP bond-slip behavior, which is based on Volkersen's contact shear single lap joint (SLJ) connection. The algorithm was validated by experimental results of fatigue center-cracked large steel plates repaired with CFRP patches. The state of stresses at the crack tip are largely influenced by a combination of the crack tip plasticity radius and overall bond surface area.

Keywords: bond-slip; carbon fibers; cohesive damage; extended finite element; fatigue and fracture repairs; hydraulic steel structures; traction-separation.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Figures

Figure 1
Figure 1
Energy release rate crack growth stages.
Figure 2
Figure 2
Implemented carbon fiber reinforced polymer (CFRP) repairs. (a) Miter gate flange. (b) Tainter valve strut arm.
Figure 3
Figure 3
Large-scale steel plate specimen configuration (a) with CFRP Repairs; (b) without CFRP Repairs.
Figure 4
Figure 4
Diagram of single lap joint.
Figure 5
Figure 5
Algorithm of analytical model.
Figure 6
Figure 6
Cycles vs. half crack length results.
Figure 7
Figure 7
Far-field stress result.
See this image and copyright information in PMC

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