Journal
ENGINEERING STRUCTURES
Volume 115, Issue -, Pages 207-219Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2016.01.045
Keywords
Long-span bridges; Traffic loading; Micro-simulation; Lane-changing; Congestion; Probabilistic modelling
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Funding
- European Commission [PITN-GA-2009-238648]
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Long-span bridge traffic loading is governed by congestion. Although congestion can take various forms, most previous studies consider only a queue of vehicles. In this paper, traffic micro-simulation is used to generate several congested traffic scenarios on a two-lane same-direction roadway passing over two long-span bridges. To this end, an acknowledged car-following model is coupled with a lane-changing model. Different traffic compositions and several congestion patterns are analysed in relation to their traffic features and influence on bridge loading. It is found that: (a) slow-moving traffic may be as critical as the full-stop condition, depending on the span length; (b) critical long in-lane truck platoons form mainly at moderate inflows, typically occurring outside of rush hours; (c) the truck distribution between lanes has a limited effect on the total loading; (d) the presence of cars has a strong indirect influence on loading through their interaction with trucks. The methodology and the findings have relevance for computing a more accurate traffic loading for long-span bridges. (C) 2016 Elsevier Ltd. All rights reserved.
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