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Assessment of dynamic soil-structure interaction effects for tall buildings: A 3D numerical approach
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.
Highlights SSI for a 20-storey building is investigated using 3D non-linear dynamic analyses. Relative merits of site amplification, kinematic and inertial interaction are isolated. Fundamental role of foundation deformability on the seismic response of the building. Filtering effect of a soft soil layer is inhibited by a crossing foundation. Embedded pile elements: reliable strategy to reduce computational costs.
Assessment of dynamic soil-structure interaction effects for tall buildings: A 3D numerical approach
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.
Highlights SSI for a 20-storey building is investigated using 3D non-linear dynamic analyses. Relative merits of site amplification, kinematic and inertial interaction are isolated. Fundamental role of foundation deformability on the seismic response of the building. Filtering effect of a soft soil layer is inhibited by a crossing foundation. Embedded pile elements: reliable strategy to reduce computational costs.
Assessment of dynamic soil-structure interaction effects for tall buildings: A 3D numerical approach
Scarfone, Riccardo (author) / Morigi, Marco (author) / Conti, Riccardo (author)
2019-09-18
Article (Journal)
Electronic Resource
English
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