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http://dx.doi.org/10.12989/sem.2019.70.2.169

Traffic control technologies without interruption for component replacement of long-span bridges using microsimulation and site-specific data  

Zhou, Junyong (College of Civil Engineering, Guangzhou University)
Shi, Xuefei (Department of Bridge Engineering, Tongji University)
Zhang, Liwen (College of Civil Engineering, Guangzhou University)
Sun, Zuo (College of Civil Engineering, Guangzhou University)
Publication Information
Structural Engineering and Mechanics / v.70, no.2, 2019 , pp. 169-178 More about this Journal
Abstract
The replacement of damaged components is an important task for long-span bridges. Conventional strategy for component replacement is to close the bridge to traffic, so that the influence of the surrounding environment is reduced to a minimum extent. However, complete traffic interruption would bring substantial economic losses and negative social influence nowadays. This paper investigates traffic control technologies without interruption for component replacement of long-span bridges. A numerical procedure of traffic control technologies is proposed incorporating traffic microsimulation and site-specific data, which is then implemented through a case study of cable replacement of a long-span cable-stayed bridge. Results indicate traffic load effects on the bridge are lower than the design values under current low daily traffic volume, and therefore cable replacement could be conducted without traffic control. However, considering a possible medium or high level of daily traffic volume, traffic load effects of girder bending moment and cable force nearest to the replaced cable become larger than the design level. This indicates a potential risk of failure, and traffic control should be implemented. Parametric studies show that speed control does not decrease but increase the load effects, and flow control using lane closure is not effectual. However, weight control and gap control are very effective to mitigate traffic load effects, and it is recommended to employ a weight control with gross vehicle weight no more than 65 t or/and a gap control with minimum vehicle gap no less than 40 m for the cable replacement of the case bridge.
Keywords
long-span bridge; component replacement; traffic control; load effect; microsimulation; multi-axle single-cell cellular automaton (MSCA);
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