Evaluation of interaction forces for coupled rigorous-substructure SSI analysis using SBFEM

• Published in: Computer Methods and Recent Advances in Geomechanics : Proceedings of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, 2014 (IACMAG 2014) pp. 797 - 802
• Main Authors: Rahnema, H, Baghlani, A, Javidsharifi, B, Mohasseb, S
• Format: Conference Proceeding
• Language: English
• Published: Leiden Taylor & Francis Books Ltd 01.01.2015
• Subjects: Boundary element method; Compressibility; Computational fluid dynamics; Convolution; Convolution integrals; Earthquakes; Engineering; Finite element analysis; Finite element method; Fourier transforms; Impulse response; Mechanical properties; Methods; Sand; Soils; Stiffness; Substructures
• ISBN: 9781138001480; 1138001481
• DOI: 10.1201/b17435-137

Three historical earthquakes have been chosen to inspect the forces caused by them on the fictitious interface of the truncated irregular bounded near-field and the semi-infinite regular far-field. Convolution integrals have been made use of to implement the Scaled Boundary Finite Element Method via unit impulse responses. Interaction forces are calculated for compressible sandy, incompressible sandy and clayey fields after the effective input motions to the interface are determined. It is observed that the effective input motion depends on the dynamic stiffness ratio of the free-field and the ground with excavation. Convolving this motion with the unit impulse response yields the interaction forces which follow a similar pattern to the motion. The overall interaction forces for Incompressible sand and clay are similar while the compressible sand results in smaller and smoother interaction forces.