Numerical assessment of bond-slip relationships for naturally corroded plain reinforcement bars in concrete beams
Artikel i vetenskaplig tidskrift, 2021

Reinforced Concrete (RC) heritage structures are often affected by corrosion. Consequently, knowledge about the effect of corrosion on the bond between reinforcing bars and surrounding concrete is critical when assessing the structural performance of these structures. In earlier work, structural tests were carried out on segments of edge beams taken from a decommissioned RC bridge. The specimens had naturally corroded plain reinforcement bars and three-point bending tests were conducted, to investigate their anchorage capacity. In this study, non-linear finite element analyses (NLFEA) were carried out to gain further insight into the bond behaviour of the tested specimens, including the effect of corrosion on the bond-slip relationship. Two different, one-dimensional (1D), bond-slip relationships were calibrated for each tested bar, to account for loss of bond upon yielding. The calibration process was based on a comparison between significant numerical and experimental results, including load–deflection curve, crack pattern and asymmetrical distribution of the yield penetration along the length of the bar. Good agreement between the FE analyses and experimental tests was observed. Finally, the calibrated bond-slip relationships for nine beams with different corrosion levels, casting positions, and visual damage are presented and discussed. The loss of bond at yielding and yield penetration asymmetry are both shown to be crucial factors for adequately describing structural behaviour.

Plain reinforcing bars

Bond

FE analyses

Reinforced concrete

Corrosion

Författare

Xiaotong Yu

Hohai University

Samanta Robuschi

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Ignasi Fernandez

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Karin Lundgren

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Engineering Structures

0141-0296 (ISSN) 1873-7323 (eISSN)

Vol. 239 112309

Sprickors effekt på armeringskorrosion (Cracor)

Trafikverket (TRV2019/108016), 2019-11-01 -- 2022-12-31.

Ämneskategorier

Teknisk mekanik

Infrastrukturteknik

Husbyggnad

DOI

10.1016/j.engstruct.2021.112309

Mer information

Senast uppdaterat

2021-11-27