Bond behaviour of NSM CFRP laminate strip systems in concrete using stiff and flexible adhesives
| Autor: | José Sena-Cruz, Szymon Seręga, Mohammadali Rezazadeh, José Ricardo Cruz, Bogusław Zając, Eduardo Pereira, Arkadiusz Kwiecień |
|---|---|
| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Simple uncoupled interface model 02 engineering and technology Slip (materials science) STRIPS Analytical model law.invention 0203 mechanical engineering law Engenharia e Tecnologia::Engenharia Civil medicine Numerical simulations Limit state design Composite material Civil and Structural Engineering chemistry.chemical_classification Stiff and flexible adhesives Science & Technology Bond Stiffness Polymer 021001 nanoscience & nanotechnology Bond length 020303 mechanical engineering & transports chemistry Ceramics and Composites Engenharia Civil [Engenharia e Tecnologia] Bond behaviour Adhesive medicine.symptom CFRP composite materials NSM technique 0210 nano-technology |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | The influence of the adhesive type on bond behaviour between concrete and Carbon Fibre Reinforced Polymers (CFRP) laminate strips, in the context of Near Surface Mounted (NSM) strengthening technique, is considered as crucial for an efficient design. Thus, direct pullout tests were carried out to assess the influence of i) type of adhesive ii) CFRP cross-section and (iii) bond length on behaviour of NSM-CFRP system. Two types of stiff adhesives and one type of flexible adhesive were studied. For similar bond lengths, significantly higher maximum pullout force and bond stiffness were observed in the case of stiff adhesives, while noticeably higher slip at maximum force was achieved with the flexible adhesive. Analytical and numerical investigations were carried out in order to determine the local bond stress-slip relationships for both stiff and flexible adhesives. After demonstrating its good predictive performance, the analytical approach was used to design curves of the required anchorage lengths of NSM-CFRP system at ultimate limit state conditions. For the analytically calibrated mechanical parameters of NSM bond-slip law a two-dimensional numerical model of the direct pullout tests was worked out. PTDC/ECMEST/1282/2014; POCI-01-0145-FEDER-016900; POCI-01-0145-FEDER-007633; SFRH/BD/131259/2017; SFRH/BSAB/150266/2019. FEDER funds through the Operational Program for Competitiveness Factors – COMPETE and National Funds through FCT (Portuguese Foundation for Science and Technology) under the project FRPLongDur POCI-01-0145-FEDER-016900 (FCT PTDC/ECMEST/1282/2014) and partly financed by the project POCI-01-0145-FEDER-007633. The first and second authors acknowledge the grants SFRH/BD/131259/2017 and SFRH/BSAB/150266/2019 provided by FCT, respectively, financed by European Social Fund and by national funds through the FCT/MCTES |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|