Abstract
Rebar corrosion, which causes section loss of rebar, is one of the serious deterioration factors for RC structures. Section loss affects not only stiffness or load capacity but also interlock condition between lugs on deformed rebar and surrounding concrete. Interlock is a dominant factor of bond between rebar and concrete and interlock effects on structural behavior of RC member can be significant. This research focused on the influence of interlock loss on the structural behavior and bond performance of RC member from experimental and analytical investigations. The static loading test for the six beams and FE analysis were conducted for the investigation on the effects of residual interlock, with or without confinement effects from stirrups. In order to evaluate interlock effects precisely, a rebar shape including lugs was reproduced by fine hexahedron elements in the FE analysis. The authors also conducted FE analytical case studies for investigating the effects of non-uniform lug loss or partially interlocking condition due to section loss of rebar. Through these investigations, it was seen that interlock could work and keep sound bond as long as contact between a lug and concrete was maintained even when the rebar lug was flattened due to section loss. Furthermore, under the situation with non-uniform distribution of section loss, pull-out behavior of rebar was prevented by interlocking of parts in a member even when other regions completely lost their interlock due to serious section loss.
Highlights
Rebar corrosion is one of the typical causes of deterioration in reinforced concrete structures
After conducting loading tests on the beams with different interlock conditions, they are analyzed by the model that reproduces the shape of rebar aim of this study is to evaluate the influence of changing the interlock condition on the aim of this study is to evaluate the influence of changing the interlock condition on the is a dominant factor in bond components, without corrosion cracks in this research
The authors tried to separate out the multiple factors of bond deterioration and focused on the interlock, which is a dominant factor in the bond components
Summary
Rebar corrosion is one of the typical causes of deterioration in reinforced concrete structures. It is caused by various factors such as chloride attack and carbonation and can lead to serious degradation of structural performance such as load-bearing capacity or ductility [1,2,3,4]. When the corrosion cracks reach concrete surface, deterioration factors can ingress and corrosion is accelerated. Rebar corrosion leads to spalling of cover concrete [5,6]. During this process, bond between the rebar and the concrete deteriorates, and it affects loadbearing mechanisms
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