TY - GEN
T1 - Evaluation of the performance of full-scale RC beams prestressed with NSM-CFRP laminates
AU - Costa, Inês
AU - Rezazadeh, Mohammadali
AU - Barros, Joaquim
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Carbon Fibre Reinforced Polymers (CFRP) applied according to the Near Surface Mounted (NSM) technique are known as capable of increasing the ultimate flexural resistance of Reinforced Concrete (RC) elements, but for Serviceability Limit States (SLS) the load increment it provides is, in general, relatively limited. Recently, researchers are giving attention towards the possibility of applying prestressed NSM-CFRPs to increase significantly the load carrying capacity of RC elements at SLS. As it is common knowledge, introducing prestress in a RC element produces an initial stress distribution, whose primary effect is, in the case of RC beams, the development of an initial deflection, typically in the opposite direction of loading. This initial stress field is the key factor that triggers most of the benefits of this technology, such as the delay in crack initiation and in steel yielding initiation. In this paper, the results of an experimental program consisting of a series of full-scale RC beams flexurally strengthened with NSM prestressed CFRP laminates up to four different levels (20%, 30%, 40% and 50%) will be presented. The experimental program is described and the main results are presented and discussed.
AB - Carbon Fibre Reinforced Polymers (CFRP) applied according to the Near Surface Mounted (NSM) technique are known as capable of increasing the ultimate flexural resistance of Reinforced Concrete (RC) elements, but for Serviceability Limit States (SLS) the load increment it provides is, in general, relatively limited. Recently, researchers are giving attention towards the possibility of applying prestressed NSM-CFRPs to increase significantly the load carrying capacity of RC elements at SLS. As it is common knowledge, introducing prestress in a RC element produces an initial stress distribution, whose primary effect is, in the case of RC beams, the development of an initial deflection, typically in the opposite direction of loading. This initial stress field is the key factor that triggers most of the benefits of this technology, such as the delay in crack initiation and in steel yielding initiation. In this paper, the results of an experimental program consisting of a series of full-scale RC beams flexurally strengthened with NSM prestressed CFRP laminates up to four different levels (20%, 30%, 40% and 50%) will be presented. The experimental program is described and the main results are presented and discussed.
UR - http://www.scopus.com/inward/record.url?scp=84924871751&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84924871751
T3 - Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014
BT - Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014
A2 - El-Hacha, Raafat
PB - International Institute for FRP in Construction (IIFC)
T2 - 7th International Conference on FRP Composites in Civil Engineering, CICE 2014
Y2 - 20 August 2014 through 22 August 2014
ER -