The bond–slip degradation relationship between carbon fiber-reinforced polymer and steel in a freeze–thaw environment is crucial to evaluate the long-term service performance of steel structures st...
Last. Carlos Chastre(IST: Instituto Superior Técnico)H-Index: 23
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Abstract The degradation mechanisms of bonded joints between CFRP laminates and steel substrates under severe environmental conditions require more durability data and studies to increase the database and better understand their causes. Studies on bond properties of double-strap CFRP-to-steel bonded joints with two different composite materials as well as adhesive coupons subjected to freeze-thaw cycles for 10,000 h were conducted to reduce that gap. In addition, the equivalent to the number of ...
#1Chuanxi Li(CSUST: Changsha University of Science and Technology)H-Index: 12
#2Lu Ke(CSUST: Changsha University of Science and Technology)H-Index: 4
Last. Yang Jiao(ASU: Arizona State University)H-Index: 36
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Abstract The bond between carbon fiber-reinforced polymer (CFRP) composites and steel is a key issue in CFRP-strengthened steel structures. The determination of key parameters in the bond strength model remains debatable. We studied the bond behavior between CFRP and steel, focusing on the effects of different types of epoxy adhesive and CFRP on the failure modes, bond–slip relationships, and bond strength parameters. The results show that due to the use of various materials, some specimens fail...
Last. Sabrina Fawzia(QUT: Queensland University of Technology)H-Index: 18
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Abstract Glass transition temperature (Tg) of the bond between CFRP and steel influences on the service and fire performance of strengthened members. A total of eighty-two CFRP/steel double strap joints were prepared and tested under elevated temperature. They were cured under a range of elevated temperature conditions in the control laboratory environment and in the open environment which is practically feasible in large civil engineering structures. The test results showed a similar trend of r...
#2Karim Benzarti(ENPC: École des ponts ParisTech)H-Index: 22
Last. Frank Lehmann(University of Stuttgart)H-Index: 5
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The authors wish to acknowledge Epsilon Composite Company for supporting the study. This work is part of the FASSTBRIDGE project. This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no 31109806.0008. FASSTbridge is co-funded by Funding Partners of The ERA-NET Plus Infravation and the European Commission. The Funding Partners of the Infravation 2014 Call are: MINISTERIE VAN INFRASTR...
Abstract Although the staggered arrangement in bolted connections can offer an efficient area usage especially for narrow members, it has the most complex stress fields. In this paper, experimental tests were performed to identify the initial stiffness of the bolted staggered joints. A 3D finite element model was developed to analyze single and double lapped bolted composite plates. The current modeling technique was validated by comparing its results against earlier experimental and numerical f...
Abstract External bonding with carbon fiber-reinforced polymer (CFRP) has been considered great potential in fatigue strengthening of defected steel components. Generally, it takes one to two weeks for a structural adhesive to achieve full strength in such a repair scheme. The potential risk of an environmental attack at the curing stage of adhesive has not been well understood. This paper presents an experimental study on the interfacial behavior of CFRP-steel double-lap joints subjected to sal...
Abstract Existing studies have showed that externally bonded fiber reinforced polymer (FRP) plates can significantly improve the fatigue behavior of cracked steel members. Of the existing studies, limited studies have been conducted on FRP-strengthened cracked steel beams, especially on the prediction methods for the crack propagation. In this paper, two prediction methods, named as the asymmetrical prediction method and the symmetrical prediction method, were developed to evaluate the fatigue c...
#1Hugo Biscaia(NOVA: Universidade Nova de Lisboa)H-Index: 20
#2Carlos Chastre(NOVA: Universidade Nova de Lisboa)H-Index: 23
Abstract The effective stress transfer between the fiber reinforced polymers (FRP) and the steel substrate is crucial for the successful retrofit of existing steel structures with FRP composites. However, there are no standard tests for FRP-to-steel interfaces, wherefore different test configurations have been used in recent years to assess the bond behaviour in these interfaces. The present study shows that the choice of test configuration is highly important and leads to different transfer str...
Abstract This paper examines the development of the bond-slip models for carbon fiber reinforced polymer (CFRP) plates externally bonded to steel substrates where debonding failure occurs in the adhesive layer. Thirteen single-shear bonded joints were tested to investigate the effects of the adhesive properties and the adhesive thickness on the bond-slip behavior of the interfaces. The test results showed that the bond-slip relationship for the bonded joints with the Sikadur-30 adhesive was appr...
Strengthening of steel structures with adhesively bonded carbon fibre reinforced polymer (CFRP) materials have become increasingly popular in the last decade. However, uncertainties regarding the durability and long-term performance of CFRP/steel joints is a major obstacle for their growing application. Previous research indicates the deleterious effects of moisture and thermal cycles on the mechanical performance of these joints. To the authors' knowledge, the combined effects of moisture and t...
This paper studied the interface slip between the CFRP sheet and the steel beam under the action of temperature and creep. The formulas of the interface slip were established by using the elastic method and energy variational method, respectively, and the accuracy of the formulas was verified by finite element analysis Abaqus. The results showed that when the creep was not taken into account, the interface slip was the maximum at the end of the beam and the minimum at the middle of the span. Whe...
Last. Yu Bai(Monash University, Clayton campus)H-Index: 69
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Abstract Carbon fibre reinforced polymers have shown an ability to provide increased strength and rehabilitation properties to steel. However, under extreme environmental conditions adhered CFRP/steel joints undergo detrimental reductions in strength and durability. This paper explores the use of silane chemical barriers and adhesive modifications to improve bond durability and retard environmental damage and restrict bond degradation. Carbon nano tube immersion in adhesives created increases in...
#1Zhen Wang(HIT: Harbin Institute of Technology)H-Index: 1
#2Guijun Xian(HIT: Harbin Institute of Technology)H-Index: 24
Abstract The long-term durability of steel structures strengthened by externally bonded carbon-fiber-reinforced polymer (CFRP) plates or sheets is a concern due to the discrepancy in the thermal expansion coefficients (CTE) between CFRP plate and steel. In the present study, the single-lap shear test was applied to study the variation of the bonding performances between CFRP plates and steel using different types of adhesive after 150, 300, and 500 temperature cycles from −20 °C to 40 °C. The re...
Abstract In this paper, a series of the carbon fiber reinforced polymer (CFRP)-steel single-shear specimens was manufactured to investigate the effects of the adhesive types and loading rates on the bond behavior of CFRP-steel interfaces. The main properties of the bonded joints were examined under loading rates of 0.01 mm/s, 10 mm/s and 100 mm/s, including the failure mode, the ultimate load, the load-slip curve, the CFRP strain distribution and the bond-slip relationship. The experimental resu...
Abstract The bond-slip model of a carbon fiber reinforced polymer (CFRP)-steel bonded interface is crucial for predicting the bond behavior of CFRP-strengthened steel structures. CFRP delamination failure is often encountered in existing studies on the bond behavior between CFRP plates and steel plates. However, this failure mode has been investigated by few scholars, especially regarding the interfacial bond-slip model based on CFRP delamination failure. In this paper, a total of 16 single-shea...
Abstract The pure mode-I, pure mode-II and the mixed-mode I/II fracture behavior of the adhesively-bonded pultruded GFRP/steel joint were experimentally investigated by using double cantilever beam (DCB) test, and four-point end-notched flexure (4ENF) test combined with four-point single leg bending (4SLB) test, respectively. The extended global method (EGM) was employed to obtain closed-form analytical solutions of mode-II fracture toughness for the 4ENF specimen and mixed-mode I/II fracture to...
