A Levenberg-Marquardt algorithm for fi tting σ-w curves from three-point bend tests for plain and fi ber reinforced concretes

Um algoritmo de Levenberg-Marquardt para ajuste de curvas σ-w a partir de ensaios de flexão em três pontos para concretos simples e reforçados com fibras

This technical note describes the implementation of the Levenberg-Marquardt algorithm for the inverse analysis of three-point bend tests on notched specimens of plain and fiber reinforced concretes for determining softening parameters (σ-w curves). Tests indicated that the algorithm is sufficiently efficient and robust.

inverse analysis; softening; concrete; Levenberg-Marquardt