Abstract
The bond-slip damage of the interface between profile steel and concrete is the key point of steel-reinforced concrete structure. This paper is based on the statistical analysis of a large amount of experimental data and the distribution characteristics of bonding stress on the bonding surface of the profile steel and concrete, and the conversion rules between the three parts (chemical bonding force, frictional resistance, and mechanical interaction) of the bond force are obtained. According to the mutual conversion rules of the three parts of the bonding force on the steel-reinforced concrete bonding surface, a mesomechanical model based on the spring-friction block element is established. Taking into account the discreteness of concrete performance on the bonding surface and the randomness of defects, using the stochastic damage theory, a constitutive model of stochastic bonding damage on the steel-reinforced concrete bonding surface is established. The comparative analysis with the results of a large number of steel-reinforced concrete pull-out tests shows that the model can reasonably reflect the damage characteristics of the steel-reinforced concrete bonding surface.
Highlights
IntroductionOnce the bond-slip on the joint surface between profile steel and concrete occurs, the cement crystal will be sheared and crushed, and the chemical bonding force will be lost and converted into frictional resistance and mechanical interaction [10]
Analysis on Bonding Stress. e bonding force between profile steel and concrete is the key to ensure that the profile steel works with concrete. e bonding force between profile steel and concrete is mainly consisted of three parts: chemical bonding force, frictional resistance, and mechanical interaction
The chemical bonding force will be generated within the diffusion length of the chemical bonding force that has not yet slipped, so that the frictional resistance, the mechanical interaction, and the chemical bonding force of the nonslip section can constitute a new force to jointly bear the external load and achieve a new balance (Figure 1)
Summary
Once the bond-slip on the joint surface between profile steel and concrete occurs, the cement crystal will be sheared and crushed, and the chemical bonding force will be lost and converted into frictional resistance and mechanical interaction [10]. According to the characteristics of the above-mentioned steel-reinforced concrete interface bonding, the spring-friction block model of J. Assume that the profile steel and concrete outside the bonding surface are rigid; consider only the force on the bonding surface, not the deformation of the profile steel and concrete, and the external force of each spring-friction block element on the bonding surface is unified. Assume that the interface damage of steel-reinforced concrete follows the continuum damage mechanics, and the interface damage variable is defined as the ratio of the fractured area to the total area; that is,
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