Human-structure dynamic interactions: Identification of two-degrees-of-freedom walking human model

E. Shahabpoor, A. Pavic

Research output: Contribution to journalArticlepeer-review

Abstract

Single-degree-of-freedom (SDOF) models are widely used as a first approximation to simulate dynamic interactions of a walking human body with a vertically vibrating structure. However, the parameters identified in the literature for such SDOF models are distinctly different for different structures and even different modes of a structure. This study hypothesises that these differences can be attributed to different modes of a human body being dominant when subjected to different vibration frequencies. A 2DOF mass-spring-damper model with two modes of vibration is proposed to simulate a walking human dynamics. The 2DOF model parameters were identified using iterative Agent-based simulations in a way that the analytical FRF of the occupied structure matches the corresponding experimental FRF measured from a series of walking tests on a lightweight floor structure. It was found that a 2DOF human model with modal frequencies 4.3Hz and 11.0Hz and modal damping ratios of 19% and 0.52% for modes one and two, respectively, generates the least error in estimated FRFs. The validation of the identified 2DOF model on a post-tensioned concrete footbridge with different walking traffic regime showed that the model can estimate the natural frequency and damping ratio of both vibration modes of the occupied structure with maximum error of 0.4% and 6%, respectively. This is the first study of its kind that proposes a physical model of a walking human that consistently simulates the dynamics of a walking human for different structures and different modes of a structure, and addresses the discrepancy in the identified parameters of the SDOF walking human model in the literature.

Original languageEnglish
Article number117974
JournalJournal of Sound and Vibration
Volume569
Early online date4 Aug 2023
DOIs
Publication statusPublished - 20 Jan 2024
Externally publishedYes

Bibliographical note

Funding Information:
The authors would like to acknowledge the contribution of Ahmed Mohammed, Atheer Al-Anbuti and Zandy Muhammad to carry out the experiments in Exeter.

Keywords

  • Agent-based modelling
  • Floor structures
  • Footbridge
  • Mass-spring-damper
  • MDOF model
  • System identification
  • Vibration serviceability assessment

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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