Live Load Model for Long Span Steel Cable Bridges Considering Traffic Congestion Scenarios
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Current design live load model for bridges are mainly for short to medium span bridges. For these bridges, one very heavy truck or a few heavy trucks may give the maximum load effects. However, for long span bridges, due to long lengths of the effective influence line, different scenarios should be considered for the bridge design. Long span bridges mainly have cable- supported structures and steel girder and deck. This paper deals with the development and application of the live load model for long span steel cable bridges considering traffic congestion scenarios. New live load model was proposed based on long-term weigh-in-motion truck weight data and various traffic congestion scenarios. Weigh-in-motion data have been collected at the location near industrial complex so that the sufficient number of loaded trucks can be measured. For the accuracy of long-term data, temperature compensation had been applied by considering the front axle weights of trucks. Traffic congestion scenarios utilizes the normal sequences of trucks arriving at the bridge with the minimum headway distances between trucks and other vehicles. One, two and four lanes scenarios are developed and used in this study. Proposed new live load model consists of four-axle truck with total weight of 510 kN and uniformly distributed load in which its magnitude is decreased as the length of the effective influence line increases. The load effects of the proposed model are compared with other well-known load model in the world for long span steel cable bridges with different span lengths.
KeywordsLive load model Long span steel bridge Traffic congestion Cable stayed bridge Suspension bridge
This work is a part of research projects through Super Long Span Bridge R&D Project. The author wishes to express the gratitude for the financial supports.
- AASHTO. (2007). AASHTO LRFD bridge design specification (4th ed.). Washington, DC: American Association of State Highway and Transportation Officials.Google Scholar
- Bentley Systems. (2010). Analysis user guide. RM Bridge V8i, October.Google Scholar
- British Standards Institution (BSI). (2001). BS 5400, steel, concrete and composite bridges. Part 2: Specification for loads.Google Scholar
- Buckland, P. G. (1981). Recommended design loads for bridges. Journal of Structural Engineering, American Society of Civil Engineers,107(7), 1161–1213.Google Scholar
- Buckland, P. G., McBryde, J. P., Navin, F. P., & Zidek, J. V. (1978). Traffic loading of long span bridges. Transportation Research Record (665).Google Scholar
- Buckland, P. G., Navin, F. P. D., Zidek, J. V., & McBryde, J. P. (1980). Proposed vehicle loading of long-span bridges. Journal of the Structural Division, 106 (ASCE 15306 Proceeding).Google Scholar
- CEN. (2002). BS EN 1990:2002. Eurocode 1. Actions on structures, European Committee for Standardization.Google Scholar
- COWI Consult. (1990). Storebelt East Bridge—design basis, BBD, May.Google Scholar
- Honshu Shikoku Bridge Authority (HSBA). (1980). Design standard for superstructure.Google Scholar
- Hwang, E. S. (2008). Development of live load model for reliability-based bridge design code, Korea Bridge Design and Engineering Research Center Technical Report Series, KBRC TRS 034.Google Scholar
- Korea Society of Civil Engineers (KSCE). (2006). Design guidelines for cable steel bridge. Korea Society of Civil Engineers.Google Scholar
- Lutomirska, M. (2009). Live load models for long span bridges. Ph.D. thesis, University of Nebraska, Lincoln, Nebraska.Google Scholar
- Midas Information Technology Co., Ltd. (2016). Midas user support system. Retrieved January 31, 2016, from http://kor.midasuser.com/civil/index.asp.
- Ministry of Land, Transport and Maritime Affairs (MLTM). (2010). Korea highway bridge design code.Google Scholar
- Ministry of Land, Transport and Maritime Affairs (MLTM). (2012). Korea highway bridge design code (limit state design).Google Scholar
- T Engineering. (2012). Third Bosporus bridge—design basis, BB3-GEN-DER-10001-7.Google Scholar