Three-dimensional Nonlinear Bond Model incorporating Transverse Action in Corroded RC Members

Abstract

Reinforcing bar corrosion induces splitting cracks in concrete along the bar axis and leads to bond deterioration. This can adversely affect the crack spacing in an RC member and have a serious effect on its serviceability. This study looks at axial nonlinearity in corroded RC members under tension and shows that fewer transverse cracks with greater spacing occur as steel corrosion progresses. The open-slip coupled model, which takes into account the transverse action associated with longitudinal bond stress transfer in the bond transition zone, is extended to cover corroded reinforcement and is successfully used to simulate the behavior of RC members in tension. Modeling of the bond transition zone and of the layer of corrosion products is found to be crucial to understanding residual bond performance after corrosion has occurred.

Effect of bond degradation due to corrosion – a literature survey

“…11. Specimen geometry, corrosion mechanism and loading procedure used in Shang et al [35] (dims. in mm) Fig.…”

“…In Shang et al [35], experimental tests were carried out on 11 specimens -RC ties with a square section, 100 × 100 mm, with length of 1000 mm reinforced with a 20 mm dia. rebar (see Fig.…”

Reinforced Concrete Members Subjected to Cyclic Tension and Corrosion

“…Those cracks can reduce the stiffness of the structural elements and can become preferential ways for the entrance of aggressive agents, if they get the external surface, so determining an increase of corrosion rate and of the structural damage (Metha and Gerwick 1982). Finally, with the grows of the corrosion penetration and the oxide product expansion, a decrease of bond between steel and concrete can take place (Al-Sulaimani et al 1990;Fang et al 2004;Shang et al 2011). As a consequence also a change in ultimate behavior at failure can be observed and structural models generally used for sound element analysis have to be modified, in order to properly simulate the actual structural behavior (Cairns andZhao 1999, Carbone et al 2008).…”

Nonlinear Bond Model for the Dowel Action considering the Fatigue Damage Effect

“…A discrete FE method is adopted in this research. Both the steel bar and concrete are modelled by three-dimensional solid elements, and interface elements with zero thickness are used to describe the effect of the bond transition zone [20,21]. Fatigue loads carried by reinforcing bars are transferred through this transition zone to the surrounding concrete.…”

“…A unified model for RC interface stress transfer was presented based on a combination of a generic bar model and a physical model for aggregate interlock [18]. An open-slip coupled model was developed to simulate the bond behavior of reinforcing bars in concrete [19] and was later extended to cover the cored reinforcement [20]. e author developed a bond model considering the coupled damage effect.…”