Scarfone, R. , Morigi, M. and Conti, R. (2020) Assessment of dynamic soil-structure interaction effects for tall buildings: A 3D numerical approach. Soil Dynamics and Earthquake Engineering, 128, 105864. (doi: 10.1016/j.soildyn.2019.105864)
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Abstract
Soil-structure interaction (SSI) phenomena are typically studied in the frequency-domain using the substructure approach, involving several simplifications. In this study, SSI effects for a 20-storey building are studied numerically performing time-domain 3D non-linear dynamic analyses, using an elastoplastic nonlinear constitutive model for the soil. Three foundation systems - a relatively shallow, a deeply embedded and a pile foundation - and two soil profiles are investigated and compared. Specifically, relative merits of site amplification, kinematic interaction and inertial interaction are isolated, and the role of foundation deformability and local stratigraphy is highlighted. To isolate such features, the results of the complete 3D models are compared with those provided by 3D numerical analyses of the sole building, of the foundation-soil systems and of the free-field soil deposit. Numerical results show that, for tall buildings, an increase in foundation deformability leads to a decrease of the maximum base shear force (seismic demand), to a higher rigid rotation of the foundation, but not to appreciably higher displacements of the structure. Moreover, possible situations where a (decoupled) substructure approach can lead to a misinterpretation of SSI phenomena are highlighted, as in the case of deep foundations crossing very soft soil layers. In addition, the use of embedded pile elements was proven to be an effective strategy in reducing the computational cost when performing complex 3D simulations of dynamic SSI problems.
| Item Type: | Articles |
|---|---|
| Additional Information: | The work presented in this paper was developed with the financial support of the Italian Department of Civil Protection within the ReLUIS research project. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Scarfone, Riccardo |
| Authors: | Scarfone, R., Morigi, M., and Conti, R. |
| College/School: | College of Science and Engineering > School of Engineering > Infrastructure and Environment |
| Journal Name: | Soil Dynamics and Earthquake Engineering |
| Publisher: | Elsevier |
| ISSN: | 0267-7261 |
| ISSN (Online): | 1879-341X |
| Published Online: | 26 September 2019 |
| Copyright Holders: | Copyright © 2019 Elsevier Ltd. |
| First Published: | First published in Soil Dynamics and Earthquake Engineering 128:105864 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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