Investigating the effect of particle shape on energy components in granular media under cyclic loading

Meshginghalam, Haleh; EMAMI Tabrizi, Mehrdad; Chenaghlou, Mohammad Reza

doi:10.22060/ceej.2024.22238.7937

Investigating the effect of particle shape on energy components in granular media under cyclic loading

Document Type : Research Article

Authors

¹ Ph.D. Candidate, Civil Engineering Faculty, Sahand University of Technology (SUT)

² Civil Engineering Faculty, Sahand University of Technology, Tabriz

³ Academic Staff, Civil Engineering Faculty, Sahand University of Technologyضو

10.22060/ceej.2024.22238.7937

Abstract

Granular dampers installed at the foundation can effectively reduce vibration in the upper stories during an earthquake. Given that particle shape is a crucial property influencing the mechanical behavior of granular materials, this study investigates the effect of particle shape on energy components and the macroscopic response of granular media. The numerical model was analyzed using the discrete element method (PFC 2D), based on an existing laboratory model and subjected to cyclic loading. Following verification, clump elements were employed to simulate particles in three shapes: a circle to represent rounded particles and a square and triangle for angular particles. Combined models featuring these three shapes were also utilized in the simulations. The results indicate that under confined conditions, over 80% of the total energy is stored as elastic strain energy or dissipated due to sliding between particles. The contribution of kinetic and damping energy accounts for approximately 10 to 15% of the total energy. Angular square-shaped particles enhance dissipated energy through damping, while triangular-shaped particles increase energy dissipation due to sliding. For optimal energy dissipation in granular media, a mixed-use of rounded and angular particles in equal proportions is recommended.

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Main Subjects

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