Lifetime Highway Bridge Traffic Load Effect from a Combination of Traffic States Allowing for Dynamic Amplification
Publication: Journal of Bridge Engineering
Volume 18, Issue 9
Abstract
Recent research has shown that the dynamic amplification factor (DAF) to be applied to free-flowing traffic-induced load effect may not be as high as previously thought. Therefore, congested traffic states may govern extreme load effect at lower bridge lengths than currently assumed. Thus, there is a need for a methodology that incorporates both free-flowing and congested traffic states in the calculation of lifetime load effect. It should allow for the relative frequency of occurrence of the different forms of traffic and any form of DAF function that may arise. This paper presents such an approach and also presents a general probabilistic DAF formulation for inclusion. Using measured traffic, the approach is applied to a range of bridge lengths and load effects employing a variety of DAF approaches from the literature, in addition to the new DAF formulation. Using a critical traffic index, it is shown that the governing form of traffic is very sensitive to the dynamic amplification model used. Further, depending on this model, congested traffic can govern short spans, and for other spans, a combination of free- and congested-flow traffic states must be considered.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 18 • Issue 9 • September 2013
Pages: 901 - 909
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 21, 2012
Accepted: Jul 20, 2012
Published ahead of production: Jul 24, 2012
Published online: Jul 25, 2012
Published in print: Sep 1, 2013
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