The importance of accurate time-integration in the numerical modelling of P-wave propagation
| Autor: | David M. G. Taborda, Vasiliki Tsaparli, David M. Potts, Stavroula Kontoe |
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| Přispěvatelé: | Geotechnical Consulting Group, Engineering and Physical Sciences Research Council |
| Rok vydání: | 2017 |
| Předmět: |
Engineering
business.industry P wave 0211 other engineering and technologies Liquefaction Mechanical engineering 010103 numerical & computational mathematics 02 engineering and technology Mechanics Dissipation Geological & Geomatics Engineering 0915 Interdisciplinary Engineering Geotechnical Engineering and Engineering Geology 01 natural sciences Resonance (particle physics) 0905 Civil Engineering Computer Science Applications Dissipative system Newmark-beta method 0101 mathematics business 0914 Resources Engineering And Extractive Metallurgy 021101 geological & geomatics engineering |
| Zdroj: | Computers and Geotechnics. 86:203-208 |
| ISSN: | 0266-352X |
| DOI: | 10.1016/j.compgeo.2017.01.017 |
| Popis: | The numerical dissipation characteristics of the Newmark and generalised-α time-integration schemes are investigated for P-wave propagation in a fully saturated level-ground sand deposit, where higher frequencies than those for S-waves are of concern. The study focuses on resonance, which has been shown to be of utmost importance for triggering liquefaction due to P-waves alone. The generalised-α scheme performs well, provided that the time-step has been carefully selected. Conversely, the dissipative Newmark method can excessively damp the response, changing radically the computed results. This implies that a computationally prohibiting small time-step would be required for Newmark to provide an accurate solution. |
| Databáze: | OpenAIRE |
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