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Evaluation of impact factor parameters for T-girder concrete bridge considering multi-lane vehicle movement

Evaluation of impact factor parameters for T-girder concrete bridge considering multi-lane... Many of the bridge design codes consider the vehicles’ dynamic effect by magnifying the static response of the bridge by a factor called impact factor (IM) or dynamic load allowance (DLA). In some of the current bridge design codes, the value of IM is specified based on a single parameter such as span length or fundamental frequency without mentioning the applicability of the same in multilane bridges. However, most of the analytical and experimental studies showed that the value of IM is influenced by a large number of parameters. In this paper, the effect of an increasing number of loading lanes, span length, vehicle weight, vehicle speeds, natural frequency, and vehicle loading positions on IM is investigated by using AASHTO (American Association of State Highway and Transportation Officials) and IRC (Indian Road Congress) vehicle loadings. Furthermore, the maximum IM is obtained from this study compared with the values specified in six different bridge design codes, and it is found that most of the current design codes overestimate the values of IM for straight T-girder concrete bridges with a good deck surface. The results are helpful to revisit the codal provisions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Innovative Infrastructure Solutions Springer Journals

Evaluation of impact factor parameters for T-girder concrete bridge considering multi-lane vehicle movement

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Publisher
Springer Journals
Copyright
Copyright © Springer Nature Switzerland AG 2022
ISSN
2364-4176
eISSN
2364-4184
DOI
10.1007/s41062-022-00823-x
Publisher site
See Article on Publisher Site

Abstract

Many of the bridge design codes consider the vehicles’ dynamic effect by magnifying the static response of the bridge by a factor called impact factor (IM) or dynamic load allowance (DLA). In some of the current bridge design codes, the value of IM is specified based on a single parameter such as span length or fundamental frequency without mentioning the applicability of the same in multilane bridges. However, most of the analytical and experimental studies showed that the value of IM is influenced by a large number of parameters. In this paper, the effect of an increasing number of loading lanes, span length, vehicle weight, vehicle speeds, natural frequency, and vehicle loading positions on IM is investigated by using AASHTO (American Association of State Highway and Transportation Officials) and IRC (Indian Road Congress) vehicle loadings. Furthermore, the maximum IM is obtained from this study compared with the values specified in six different bridge design codes, and it is found that most of the current design codes overestimate the values of IM for straight T-girder concrete bridges with a good deck surface. The results are helpful to revisit the codal provisions.

Journal

Innovative Infrastructure Solutions – Springer Journals

Published: Jun 1, 2022

Keywords: Impact factor; Multi-lane; T-girder bridge; Bridge loading; Vehicle speed

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