Numerical simulation of flexural behaviors of FRP strengthened RC beams at different steel corrosion rates

Title: Numerical simulation of flexural behaviors of FRP strengthened RC beams at different steel corrosion rates
Author(s): J. L. Pan, C. Y. Qi, Y. F. Huang
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 592 - 599
Total Pages: 8
Nb references: 11
Language: English

Abstract: For FRP (fiber reinforced polymer) strengthened RC beams, the effective area of steel bars decreases with continue corrosive action of chloride ion, as well as bonding strength between steel or FRP and concrete. In this paper, eight FRP strengthened reinforced concrete (RC) beams have been numerically simulated to study the failure mechanisms and flexural behaviors under different corrosion rates. In the simulations, the bond slip relations between FRP and concrete or steel and concrete have been considered. The results indicated that the failure mode of the strengthened beams turned from the flexural failure to bond slip failure between steel and concrete with increasing the corrosion rate. For the same external load, the stress level of the FRP plate increases with the corrosion rate, indicating that the load carried by the steel reinforcement becomes smaller due to reduction of the effective area. It is also found that there is a critical corrosion rate around 10% for the strengthened beam to obtain the most ductile, and the deflection of the beam at the rate reaches 60.8 mm. Although the flexural load capacity for the strengthened beams decrease with the corrosion rate, the FRP can retard the loss of the loading and provide enough ductility for the beams subjected to corrosion.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00