Title:
Behavior of Corroded Bar Anchorages
Author(s):
S. P. Tastani and S. J. Pantazopoulou
Publication:
Structural Journal
Volume:
104
Issue:
6
Appears on pages(s):
756-766
Keywords:
anchorage; assessment; bond; corrosion; cover; cracking; FRP jacket; modeling
DOI:
10.14359/18958
Date:
11/1/2007
Abstract:
An analytical model is developed to describe the mechanics of corrosion-induced bond strength degradation and its implications on development capacity of bar anchorages. The model is a frictional construct whereby bond strength is estimated from the coefficient of friction and the normal confining pressure along the anchorage. Both variables are evaluated considering the relevant design parameters (cover, shrinkage, and transverse reinforcement) and the effects of iron depletion. The model is used to interpret the behavior of corroded anchorages as documented in published experiments. To supplement model calibration with data representative of long anchorages, two series of flexural specimens designed to fail in anchorage after yielding are tested after being conditioned in accelerated corrosion to a predefined damage level in the anchorage zones. The effects of corrosion on bond strength are also considered in CFRP-patch repaired anchorages. The model correlates the experimental evidence obtained from the various alternative test arrangements and successfully reproduces the magnitude and parametric sensitivity of corrosion-induced bond degradation.