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Estimation of extreme load effects on long-span bridges using traffic image data
Micu, Elena Alexandra; O'Brien, Eugene John; Malekjafarian, Abdollah; Quilligan, Michael
This paper proposes an algorithm for the estimation of extreme intensity of traffic load on long-span bridges. Most Weigh-in-Motion technologies do not operate in congested conditions which are the governing cases for these bridges. In the absence of Weigh-in-Motion data on the bridge itself, a correlation between vehicle weights and their lengths is established here using a (freeflowing) Weigh-in-Motion database. Photographic images of congested traffic are modelled here for three bridges using weights estimated from lengths and one year of Weigh-in-Motion data. The actual weights are taken from the Weigh-in- Motion data, and the results are compared to test the method. The gaps between vehicles are firstly set to a constant value and later to Beta-distributed values according to vehicle type. The intensity of traffic load for all pictures is calculated and compared to the loads obtained from the recorded weights. A return period of 75-year is chosen to evaluate the extreme values of intensity. The probability that intensity of load is being exceeded is obtained using normal probability paper for both recorded and simulated weights. This study demonstrates the feasibility of the proposed concept of using lengths to estimate the extreme traffic load events with acceptable accuracy.
Keyword(s): bridge; congestion; long-span; traffic load; vehicle length; Weigh-in-Motion (WIM)
Publication Date:
2018
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University of Limerick
Citation(s): The Baltic Journal of Road and Bridge Engineering;13 (4), pp. 429-446
https://doi.org/10.7250/bjrbe.2018-13.427
Publisher(s): Vilniaus Gedimino Technikos Universitetas
First Indexed: 2019-01-18 06:28:51 Last Updated: 2019-01-18 06:28:51