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Analytical Estimation of the Creep Behaviour of Basalt FRP Bars Below the Creep Rupture Limit
Fibre reinforced polymers (FRPs) have been attracting research and construction industry interest as a more lightweight, durable, and higher strength reinforcing option. With the recent increasing focus on low carbon solutions and materials, basalt FRP in particular has gained attention of the engineering community as a potential sustainable alternative to steel reinforcement. The mechanical properties of BFRP reinforcement and structural behaviour of concrete elements reinforced with this composite material have been analysed in published research. However, long-term properties and time-dependent behaviour need further investigation.
One of the key properties of all FRPs, including basalt FRP, is creep. The understanding and ability of analytical prediction of this rheological property is crucial for confidence in the design and use of this composite material. While determination of the creep rupture limit is important for safety, the estimation of long-term creep deformations at load levels below this limit is also needed to inform design. This is especially important for prestressed concrete applications, as one of the sources of losses of prestress. This paper offers numerical expressions which describe creep of BFRP bars. The formulae are based on experimental data obtained by over 3000 h of creep testing of BFRP bars. A logarithmic expression was initially developed for comparison to previously published research, indicating a similarity between data gathered via creep testing and relaxation data. Additionally, the longer experimentally investigated period allowed for an improved representation of the behaviour, with the newly proposed expression describing the observed asymptotic behaviour.
Analytical Estimation of the Creep Behaviour of Basalt FRP Bars Below the Creep Rupture Limit
Fibre reinforced polymers (FRPs) have been attracting research and construction industry interest as a more lightweight, durable, and higher strength reinforcing option. With the recent increasing focus on low carbon solutions and materials, basalt FRP in particular has gained attention of the engineering community as a potential sustainable alternative to steel reinforcement. The mechanical properties of BFRP reinforcement and structural behaviour of concrete elements reinforced with this composite material have been analysed in published research. However, long-term properties and time-dependent behaviour need further investigation.
One of the key properties of all FRPs, including basalt FRP, is creep. The understanding and ability of analytical prediction of this rheological property is crucial for confidence in the design and use of this composite material. While determination of the creep rupture limit is important for safety, the estimation of long-term creep deformations at load levels below this limit is also needed to inform design. This is especially important for prestressed concrete applications, as one of the sources of losses of prestress. This paper offers numerical expressions which describe creep of BFRP bars. The formulae are based on experimental data obtained by over 3000 h of creep testing of BFRP bars. A logarithmic expression was initially developed for comparison to previously published research, indicating a similarity between data gathered via creep testing and relaxation data. Additionally, the longer experimentally investigated period allowed for an improved representation of the behaviour, with the newly proposed expression describing the observed asymptotic behaviour.
Analytical Estimation of the Creep Behaviour of Basalt FRP Bars Below the Creep Rupture Limit
Lecture Notes in Civil Engineering
Ilki, Alper (editor) / Çavunt, Derya (editor) / Çavunt, Yavuz Selim (editor) / Pavlović, Ana (author) / Donchev, Ted (author) / Petkova, Diana (author)
International Symposium of the International Federation for Structural Concrete ; 2023 ; Istanbul, Türkiye
2023-06-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
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