What question did this study set out to answer?

To investigate how adjacent high-rise structures interact with each other and deep soft soils during seismic events.

April 18, 2026Open Access

Dynamic interaction analysis of adjacent high-rise structure systems on deep soft sites

Key Points

To investigate how adjacent high-rise structures interact with each other and deep soft soils during seismic events.
Conducted parametric analyses using three-dimensional finite element modeling.
Varied building spacings between 10-40 meters and assessed different foundation types.
Evaluated the impact of soil stiffness on structure-soil interactions.
Peak interstory drift ratios increased by up to 38% compared to isolated scenarios.
Maximum foundation displacement amplified by 25% for the closest building pairs.
Fundamental natural frequencies decreased by as much as 15% on softer soils.

Abstract

The dynamic interaction of adjacent high-rise structures on deep soft soils was systematically investigated using advanced three-dimensional finite element modeling. Parametric analyses considered varying building spacings (10-40 m), foundation types, and soil stiffness values. Compared with isolated soil-structure interaction (SSI), the structure-soil-structure interaction (SSSI/DCI) scenario increased peak interstory drift ratios by up to 38 % and amplified maximum foundation displacement by 25 % for the closest building pairs. Dynamic coupling also resulted in a reduction of fundamental natural frequencies by as much as 15 %. The influence of soil flexibility was found to be critical; structures on softer soils experienced stronger interaction and greater seismic response amplification. The findings provide quantitative evidence and practical guidance for the seismic design of high-rise clusters in urban environments with deep soft ground.

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