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Title: Improvement in the computational efficiency of the coupled FEM-SBFEM approach for 3D seismic SSI analysis in the time domain
Authors: Syed N.M.
Maheshwari, Bal Krishna
Published in: Computers and Geotechnics
Abstract: The scaled boundary finite element method (SBFEM) is an attractive approach for modelling unbounded media because it offers the advantages of both the finite element method (FEM) and the boundary element method (BEM) avoiding their respective drawbacks. Unfortunately, being a rigorous method, the SBFEM exhibits non-locality in both time and space, which results in significant numerical effort, especially for large problems with many degrees of freedom and a long simulation time. In order to improve the performance of this method, two different approximation techniques - one in time and one in space have been combined and implemented in the present work. A three-dimensional embedded footing problem was solved for the dynamic load, including a chirp load and a sinusoidal load. The combination of the two approximation techniques implemented in the time domain-coupled FEM-SBFEM approach for 3D analysis leads to significant reduction in computational time and storage requirements with insignificant loss in accuracy. The computational time required for the approximation techniques was found to be only 5% of that required using the conventional method, whereas the loss in accuracy was found to be less than 5%. Further, numerical problems for the externally applied dynamic load as well as the seismic load demonstrate the applicability of the coupled FEM-SBFEM approach for modelling dynamic soil-structure interaction (SSI) problems. © 2015 Elsevier Ltd.
Citation: Computers and Geotechnics (2015), 67(): 204-212
Issue Date: 2015
Publisher: Elsevier Ltd
Keywords: Computational efficiency
Radiation condition
Soil-structure interaction
ISSN: 0266352X
Author Scopus IDs: 54977672400
Author Affiliations: Syed, N.M., Dept. of Earthquake Eng., IIT Roorkee, India
Maheshwari, B.K., Dept. of Earthquake Eng., IIT Roorkee, India
Funding Details: The research work presented here was supported by the Institute Fellowship granted to the first author from the Ministry of Human Resource Development, Govt. of India. This support is gratefully acknowledged. The authors are thankful to Prof. and Head, Dept. of Earthquake Engineering, IIT Roorkee for extending every possible form of help.
Corresponding Author: Maheshwari, B.K.; Dept. of Earthquake Eng., IIT RoorkeeIndia
Appears in Collections:Journal Publications [EQ]

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