Soil-Structure Interaction Dynamics in Seismic Contexts

Soil-structure interaction (SSI) dynamics describe the two-way exchange of forces and energy between a vibrating soil medium and the foundations of built structures during seismic events. This complex interplay modifies ground motion characteristics, alters structural responses and influences the distribution of seismic demands. In particular, kinematic interaction reflects the distortion of seismic waves as they pass through near-surface layers, while inertial interaction arises from the transmitting forces exerted by the moving structure back into the supporting soil. Beyond single-building analyses, the phenomena of structure-soil-structure interaction (SSSI) capture how adjacent foundations and neighbouring edifices may amplify or dampen each other’s motion, especially in dense urban settings. Recent research has advanced multi-scale numerical methods, from three-dimensional finite element simulations with sophisticated soil constitutive models to city-scale experimental platforms, yielding more accurate predictions of seismic risk and informing resilient design strategies across diverse geological contexts.

Research from Nature Portfolio

Recent studies have introduced a high-fidelity three-dimensional computational framework that couples non-linear soil constitutive laws with advanced boundary-truncation techniques, allowing seamless propagation of seismic waves into an unbounded domain. This approach has demonstrated substantial improvements in predicting foundation uplift and lateral displacements for deep-embedded structures. Complementary work has employed novel field-scale instrumentation arrays to capture in situ soil-foundation response spectra, revealing that local variability in shear wave velocity can lead to unexpected concentration of seismic energy at particular structural resonances. Further experimental research using a large-scale shaking-table facility has replicated multi-building clusters, quantifying how group effects and inter-foundation spacing critically affect both individual and collective seismic behaviour.

Research from all publishers

In a comprehensive state-of-the-art review, researchers synthesised the strengths and limitations of prevalent SSI modelling techniques, from substructure approaches to direct time-domain finite element analyses, and highlighted gaps in code provisions across international guidelines. This work underscored the need for unified criteria to account for period elongation and damping enhancement in design practice. Another recent contribution developed a velocity-based space-time finite element method incorporating viscous boundary conditions and free-field dynamic loading, successfully simulating the seismic response of earth dams and embankments. This formulation has been applied to prototype gravity dams, showing close agreement with semi-discrete models and offering a practical computational route for large-scale infrastructure projects. A third study explored machine learning as a cost-effective surrogate for conventional SSI analysis, training neural networks on combined soil and seismic input parameters to predict structural demand measures with high accuracy while dramatically reducing computation time.

Soil-Structure Interaction Dynamics in Seismic Contexts publication trend

The graph below shows the total number of articles in soil-structure interaction dynamics in seismic contexts across all publications each year (not limited to Nature Index journals).

Technical terms

Soil-Structure Interaction (SSI): The mutual influence between ground motion and structural response, comprising kinematic and inertial components.

Structure-Soil-Structure Interaction (SSSI): The dynamic coupling among multiple adjacent foundations through shared soil deformations under seismic excitation.

Viscous Boundary Conditions: Artificial damping layers applied at the edges of numerical models to simulate energy radiation into an infinite soil medium.

Shear Wave Velocity (Vs): The speed at which shear (transverse) seismic waves travel through soil or rock, indicative of stiffness and site classification.

Finite Element Method (FEM): A numerical technique dividing continuous systems into discrete elements to approximate dynamic behaviour under complex loading.

References

1. Space–time finite element method with domain reduction techniques for dynamic soil–structure interaction problems. International Journal of Mechanical System Dynamics (2024).
2. Soil-structure interaction: A state-of-the-art review of modeling techniques and studies on seismic response of building structures. Frontiers in Built Environment (2023).
3. The Effect of Soil-Structure Interaction on the Seismic Response of Structures Using Machine Learning, Finite Element Modeling and ASCE 7-16 Methods. Sensors (2023).