Modeling in ABAQUS for Experimental Investigation of Multi-linear Bond Slip Properties in Reinforced Concrete
Keywords:
Abaqus, Bond-Slip, CDP model, cohesive surface, constitutive properties, experimental, multi-linear damage evolution, on-site material.Abstract
Integrity of R.C.C. solely depends on bond between concrete and rebar. Most of the times, bond-slip
properties are modeled as indirect parameters in numerical analysis. This indirect approach fails to capture true bond
slip character especially in sensitive areas like connections. To understand behavior of RCC in connection region it is
felt essential to model true bond slip between concrete and rebar.
Direct bond slip approach is usually avoided by researchers due to increased number of elements and difficulties in
curvature contact modeling. Multi-linear or exponential nature of bond slip curve makes it even more complicated to
model for numerical analysis..
This work is an attempt to mathematically model experimentally evaluated constitutive bond slip properties of onsite
material in ABAQUS. Bond slip properties are mathematically modeled in ABAQUS using cohesive properties and
damage evolution option. The geometry of rebar is slightly modified in order to reduce number of elements and to
improve curvature contact parameters. Detailed procedure to obtain multi-linear damage evolution is also described.
Experimental and numerical results are compared to establish efficacy of mathematical model.
