Coupled Dynamic Response of Multi-Story Suspended Floors System under Multidimensional Seismic Excitation Considering Soil-Structure Interaction

Qingguang He; Zihao Zhou; Chuanzhi Sun

doi:10.56748/ejse.26882

Authors

Qingguang He Lanzhou University of Technology https://orcid.org/0000-0002-8084-1605
Zihao Zhou Lanzhou University of Technology https://orcid.org/0009-0001-1527-0041
Chuanzhi Sun Suqian College

DOI:

https://doi.org/10.56748/ejse.26882

Keywords:

Multi-story suspended floors system, Soil-structure interaction, Multidimensional seismic excitation, Near-field pulse-like ground motion, Dynamic response

Abstract

To investigate the multidimensional seismic response of a multi-story suspended floors system considering soil-structure interaction (SSI), a three-dimensional finite element model was established in ABAQUS. Displacement, acceleration, and hanger rod stress responses under near-field pulse-like (NF-P), near-field non-pulse-like (NF-NP), and far-field (FF) ground motions were analyzed, with a focus on the coupling effects of the vertical seismic component. Results show that SSI prolongs structural periods, especially in higher modes. The vertical seismic component nonlinearly amplifies vertical responses: under NF-P ground motion with a PGA of 0.5 g, vertical displacement and acceleration of the main structure increase by 2.71 and 2.87 times, respectively, compared to horizontal-only excitation. The acceleration of suspended floor slabs shows even greater sensitivity, with amplification up to 5.57 times. Hanger rod stress increases by 19% due to vertical seismic input. These findings highlight the necessity of incorporating SSI and vertical seismic effects into design codes for suspended structures, especially in near-fault regions, to improve the structural safety and seismic performance of such structures.

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