A Computational Tool for the Nonlinear Analysis of Reinforced Concrete Membrane Elements

Resumo

This study presents the development of a computational tool for analyzing the behavior of reinforced concrete membrane elements under biaxial stress, based on the Modified Compression Field Theory (MCFT) and Rotating-Angle Softened Truss Model (RA-STM). These models rely on solving systems of nonlinear equations derived from equilibrium equations, strain compatibility, and constitutive material models. Developed in Python, the software employs the Mohr Compatibility Truss Model (MCTM), a simplified linear model, to initialize the iterative process. The proposed methodology was validated by comparing results with numerical solutions and experimental data available in literature, confirming the effectiveness of the implemented models. Results indicated that while both MCFT and RA-STM provided satisfactory responses, the MCFT achieved superior accuracy due to its consideration of concrete tension stiffening, a feature absent in the RA-STM. The tool has a graphical interface which allows users to easily input parameters, select between analysis models, visualize stress-strain responses, and export results for further analysis. Such interactive capabilities facilitate evaluation of different material property combinations, improving productivity and facilitating decision-making in design processes. Ultimately, the tool offers a practical, efficient, and low-cost solution for the structural analysis of reinforced concrete panels subjected to membrane forces. Its intuitive interface makes it accessible to both engineering professionals and students, even those without advanced programming expertise.