A model for the anchorage of corroded reinforcement: validation and application
Paper in proceedings, 2015

When reinforcement in concrete corrodes, splitting stresses around corroded bars may lead to cover cracking and even cover spalling, affecting the anchorage. The aim of this study was to validate an existing one-dimensional (1D) analysis for anchorage capacity, and to show how it can be applied in assessment of existing bridges. The 1D analysis was validated through comparisons to experiments and detailed 3D finite element analyses. The methodology is exemplified in assessment of two bridges built in the 1960s. The bridges exhibit systematic damage in the form of spalled concrete on the bottom side of the main beams at cast joints where large amounts of reinforcement are spliced. The anchorage length needed to anchor the yield force was calculated from the bond-slip response, using the one-dimensional bond-slip differential equation. The model proved to be easy to use in practical design work. Furthermore, the bridges could be shown to have sufficient capacity, and costly strengthening could be avoided. This work clearly demonstrates the potential to certify sufficient loadcarrying capacity of corroded reinforced concrete structures through improved models.

corrosion

bond

concrete

Author

Karin Lundgren

Chalmers, Civil and Environmental Engineering, Structural Engineering

Kamyab Zandi

Chalmers, Civil and Environmental Engineering, Structural Engineering

Ulf Nilsson

Ramböll AB

Concrete – Innovation and Design, fib Symposium, Copenhagen May 18-20, 2015

135-136

Driving Forces

Sustainable development

Areas of Advance

Building Futures (2010-2018)

Subject Categories

Civil Engineering

More information

Created

10/8/2017