Performance of RC frames with hybrid reinforcement under reversed cyclic loading

Title: Performance of RC frames with hybrid reinforcement under reversed cyclic loading
Author(s): M. Nehdi, A. Said
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 38
Issue: 280
Issue date: 2005-07-01
Publication year: 2005
Pages: 627 - 637
Total Pages: 11
Nb references: 26
Language: English

Abstract: The use of FRP as reinforcement in concrete structures has been growing rapidly.
A potential application of FRP reinforcement is in reinforced concrete (RC) frames.
However, due to FRP’s predominantly elastic behaviour, FRP-RC members exhibit low ductility and energy dissipation.
Hybrid steel-FRP reinforcement can be a viable solution to the lack of ductility of FRP-RC members.
Using two layers of reinforcement in a section, FRP rebars can be placed in the outer layer and steel rebars in the inner layer away from the effects of carbonation and chloride intrusion.
Combined with the use of FRP stirrups, this approach can enhance the corrosion resistance of RC members.
However, current design standards and detailing criteria for FRP-RC structures do not provide detailed seismic provisions.
In particular, the design and detailing of beam-column joints is a key issue in seismic design.
During recent earthquakes, many structural collapses were initiated or caused by beamcolumn joint failures.
Thus, research is needed to gain a better understanding of the behaviour of FRP and hybrid FRP-steel-RC under seismic loading.
In this study, three full-scale beam-column joint specimens reinforced with steel, GFRP and a hybrid GFRP-steel configuration, respectively were tested in order to investigate their performance in the event of an earthquake.
The control steel-reinforced specimen was detailed according to the current Canadian Code recommendations.
The GFRPreinforced specimen and the hybrid specimen were detailed in a similar scheme.
The behaviour of the three specimens under reversed cyclic loading, their load-storey drift envelope relationship and energy dissipation ability were compared.
The GFRP-reinforced specimen showed a predominantly elastic behaviour with very low energy dissipation ability, while the hybrid GFRP-steel scheme substantially enhanced the energy dissipation ability compared to that of a steel-free specimen.
The performance of all specimens was acceptable in terms of total storey drift demand.

Online publication: 2005-01-21
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/14221