Open AccessVertical Load Generated by Walking Person – Comparative Analysis of Selected Load Models
Author(s) -
Marek Pańtak,
Kinga Marecik
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/603/4/042047
Subject(s) - structural dynamics , vibration , limit (mathematics) , span (engineering) , dynamic load testing , structural engineering , natural frequency , point (geometry) , computer science , mathematics , finite element method , engineering , physics , acoustics , mathematical analysis , geometry
The natural vibration frequencies of footbridges with a span length greater than 30 m are very often less than 5.00 Hz. This increases the risk of excitation of vibrations of these footbridges by their users and entails the need to perform their dynamic analyses with the use of appropriate models of the dynamic loads generated by pedestrians. The accurateness of estimation of the value of dynamic loads acting on the structure is one of the important issues from the point of view of the accuracy of dynamic analyses. In the paper, the results of comparative analyses of five selected mathematical models of vertical ground reaction forces ( VGRFs ) were presented. The modelled forces were compared with the VGRFs acquired during the laboratory measurements of the forces generated by walking people. Moreover, the dynamic analyses of single degree of freedom system ( SDOF ) were carried out to assess the differences between the dynamic responses caused by analysed load models. Performed analyses showed a good agreement between the time courses of the estimated and measured VGRFs . Nevertheless, because of the simplifications adopted in the individual models some of them allow predicting the lower limit and the other upper limit of the dynamic response of the structure.