ROLE OF MESH TYPE IN 3D DYNAMIC SOIL–STRUCTURE INTERACTION SIMULATIONS

Authors : Mehmet Ömer Timurağaoğlu

Pages : 663-676

Doi:10.17482/uumfd.1756215

View : 389 | Download : 492

Publication Date : 2025-12-19

Article Type : Research Paper

Abstract :With the advancement of numerical modeling techniques, the problem of soil–structure interaction (SSI) has become the subject of extensive research in recent years. One of the most critical stages of this problem is the site response analysis (SRA). SRA provides designers with valuable insights into the soil\\\'s expected seismic response in the superstructure\\\'s absence. The present work investigates the influence of mesh type on dynamic SSI through three-dimensional (3D) finite element-based SRA. Models were developed using three different mesh types—hexahedral, tetrahedral, and hybrid—with absorbing boundary conditions applied along the lateral edges. The 3D model results were verified by comparison with one-dimensional (1D) analyses subjected to the same ground motion. In the study, the soil was assumed to exhibit linear elastic behavior, and all 1D and 3D analyses were performed based on this assumption. The 3D models could accurately represent the 1D site response through ground surface response spectrum. The findings reveal that the dynamic response of the soil system is mainly independent of the element type provided that a properly structured and sufficiently refined mesh is employed. Conversely, auto-generated irregular meshes tend to produce inaccurate results. Among the mesh types evaluated, hybrid meshes offer the most favorable balance regarding computational efficiency.
Keywords : Ağ tipi, Sonlu elemanlar yöntemi, Zemin davranış analizleri, Yapı-zemin etkileşimi, Dinamik analiz

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