Theoretical treatment of crowd-structure interaction dynamics

NA Alexander

Research output: Contribution to journalArticle (Academic Journal)peer-review

33 Citations (Scopus)


The equations governing crowd–structure interaction dynamics are derived from first principles. No assumptions are made about structural support conditions, crowd or beam displacements or crowdinduced forces in this derivation. The general equations of motion are shown to exist in pairs of two-degrees-offreedom systems, for every ith beam–crowd mode. Numerical optimisation of the system response functions is preferred to both classical undamped eigenvalue analysis and a damped complex eigenvalue analysis using a state space formulation. Single parameter continuation of optima of frequency response functions is employed. In addition, two parameter continuations of folds of these optima are used. As a result, a fold loci plot in parameter space defines the region where multiple beam optima exist. This results in the possibility of complicated response behaviour. Increases in predominant frequency of the structure with increasing crowd mass are observed. In other cases, sudden drops in predominant frequency with increasing crowd mass are observed.
Translated title of the contributionTheoretical treatment of crowd-structure interaction dynamics
Original languageEnglish
Pages (from-to)329 - 338
Number of pages10
JournalProceedings of the ICE - Structures and Buildings
Volume159 (6)
Publication statusPublished - Dec 2006

Bibliographical note

Publisher: Thomas Telford


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