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Structural Engineering and Mechanics Volume 21, Number 4, November10 2005 , pages 437-450 DOI: https://doi.org/10.12989/sem.2005.21.4.437 |
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An effective finite element approach for soil-structure analysis in the time-domain |
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L. Lehmann
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| Abstract | ||
| In this study, a complete analysis of soil-structure interaction problems is presented which includes a modelling of the near surrounding of the building (near-field) and a special description of the wave propagation process in larger distances (far-field). In order to reduce the computational effort which can be very high for time domain analysis of wave propagation problems, a special approach based on similarity transformation of the infinite domain on the near-field/far-field interface is applied for the wave radiation of the far-field. The near-field is discretised with standard Finite Elements, which also allows to introduce non-linear material behaviour. In this paper, a new approach to calculate the involved convolution integrals is presented. This approximation in time leads to a dramatically reduced computational effort for long simulation times, while the accuracy of the method is not affected. Finally, some benchmark examples are presented, which are compared to a coupled Finite Element/Boundary Element approach. The results are in excellent agreement with those of the coupled Finite Element/Boundary Element procedure, while the accuracy is not reduced. Furthermore, the presented approach is easy to incorporate in any Finite Element code, so the practical relevance is high. | ||
| Key Words | ||
| soil-structure interaction; time domain; finite element method; scaled boundary finite element method; coupled analysis. | ||
| Address | ||
| Institute of Applied Mechanics, Technical Univ. of Braunschweig, Spielmannstr. 11, D-38106 Braunschweig, Germany | ||