On the Calibration of a Numerical Model for Concrete-to-Concrete Interface

Area of Science:

• * Engineering Mechanics
• * Materials Science
• * Computational Mechanics

Background:

• * Concrete-to-concrete interfaces are critical in modern composite structures.
• * Accurate characterization of interface behavior is essential for structural integrity.
• * Existing models may not fully capture the complex behavior of these interfaces.

Purpose of the Study:

• * To develop and validate a numerical model for concrete-to-concrete interfaces.
• * To enhance existing interface models with a realistic strength envelope.
• * To improve understanding of interface behavior and failure mechanisms in common tests.

Main Methods:

• * Employed cohesive finite elements and the elastic-damage traction-separation law in Abaqus.
• * Enhanced the default interface material model using a user-field-variables subroutine.
• * Validated the model through numerical simulations of three-point bending, splitting, and slant-shear tests.

Main Results:

• * The proposed numerical modeling strategy demonstrated high accuracy, with a mean ratio of ultimate forces of 1.01.
• * Simulations successfully replicated experimental results for various interface strength tests.
• * The study provided insights into the failure mechanisms observed in standard interface tests.

Conclusions:

• * The validated numerical model offers a reliable tool for analyzing concrete-to-concrete interfaces.
• * The enhanced model accurately predicts the behavior and strength of these interfaces.
• * This research contributes to a better understanding of interface mechanics and testing methodologies.