Abstract
A finite element study carried out using LS DYNA and aimed to simulate the monotonic pull-out test of deformed steel rebar embedded in concrete is presented in this paper. Three models of the interface between deformed steel rebar and well-confined concrete, i.e. perfect bond model and two bond-slip models are observed and compared. Bond stress-slip response and rebar stress-slip response obtained numerically are validated with experimental data and empirical equations available from the literature. The full bond model overestimates the response, providing higher rebar stress. In the bond-slip models, good agreement is observed between numerical and experimental bond stress and rebar Stress–slip responses. The empirical equation of bond-slip proposed by Murcia-Delso and Shing (2014) is found to overestimate the peak bond stress.
Highlights
Reinforced concrete (RC) material is a composite material of concrete that has relatively low tensile strength and steel rebar to compensate for the ductility of the component with its high tensile strength and ductility
It is observed that Model 3 which incorporates bond-slip with adjusted empirical peak bond is in good agreement with the bond failure pattern of the specimen from the experiment as shown in Fig. 1, it provides more realistic measures
It is found that Model 3 of the bond slip model with adjusted peak bond provides a better estimate than the full bond of Model 1 and bond-slip Model 2 using MurciaDelso empirical equations
Summary
Reinforced concrete (RC) material is a composite material of concrete that has relatively low tensile strength and steel rebar to compensate for the ductility of the component with its high tensile strength and ductility. As it composes of two different materials, the interface between the concrete and steel becomes the weak part. The crack appears within this interface and stress will increase towards its capacity as the limiting value In such a location, once the stress reaches its interface capacity, i.e., maximum bond stress, the transmitted stress between steel and concrete begins to drop to zero. One of the full bond and two bond-slip models are analyzed and presented in this paper
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