Temperature gradient and its effect on flat steel box girder of long-span suspension bridge
- 300 Downloads
The temperature field variation law and distribution characteristics of an orthotropic flat steel box girder under sunny conditions were analyzed through a field temperature test on the steel box girder of the operational Runyang Yangtze River Bridge (the suspension bridge part). Function optimization fitting and error analysis of the test data were conducted. A temperature gradient distribution curve applicable to a hexagonal flat steel box girder was proposed. Based on the measurement results, the temperature effect of an orthotropic flat steel box girder was analyzed using finite element method and the effects of different temperature gradient modes on the mechanical characteristics and stress distribution of the steel box girder were compared. Under sunny conditions, heat conduction in the flat steel box girder structure shows distinct “box-room effect” characteristics, and the actual temperature gradient distribution is inconsistent with the one suggested by the existing standards. The thermal stress of a steel box girder calculated from the measured temperature gradient mode exceeds that calculated from the standard, and the intensity approximates that under the action of designed vehicle loads. The temperature-induced stress is distributed centrally near the manufacturing welds of the orthotropic steel box girder, which should be considered in design, construction and research. Results from this study could supplement the existing bridge and culvert design standards.
Keywordslong-span bridge flat steel box girder temperature gradient temperature effect
Unable to display preview. Download preview PDF.
- 6.Capps M W R. The thermal behavior of the Beachley Viaduct/Wye Bridge. Ministry of Transport, Road Research Laboratory, RRL Report LR 234. 1968Google Scholar
- 7.Emerson M. The calculation of the distribution of temperature in bridges. Department of the Environment, TRRL Report LR 561. 1973Google Scholar
- 9.Au F T K, Tham L G, Tong M, et al. Temperature monitoring of steel bridges. In: 6th Annual International Symposium on NDE for Health Monitoring and Diagnostics. Newport Beach, 2001. 282–291Google Scholar
- 10.Xia Y, Chen B, Xu Y. Temperature monitoring of tsing ma suspension bridge: Numerical simulation and field measurement. In: Earth and Space 2010: Engineering, Science, Construction and Operations in Challenging Environments. ASCE, 2010. 2535–2542Google Scholar
- 12.Hao C. Study on nonlinear influence of temperature on long-span steel cable-stayed bridge during construction (in Chinese). J Highway Transport Res Dev, 2003, 20: 63–66Google Scholar
- 13.Zhang Y P, Yang N, Li C X. Research on temperature field of steel box girder without pavement caused by the solar radiations. J Eng Mech, 2011, 28: 156–160Google Scholar
- 14.Sun J, Li A, Ding Y. Observation and research on temperature distribution in steel box girders of Runyang Yangtse River Bridge (in Chinese). J Highway Transport Res Dev, 2009, 26: 94–98Google Scholar
- 15.British Standard Institute. BS5400: Part2: 1978, Steel, concrete and composite bridges (Part 2. Specification for loads), 1978. 20–23Google Scholar
- 16.JTG D60-2004. General Code for Design of Highway Bridges and Culverts (in Chinese). Beijing: China Communications Press, 2004. 88–89Google Scholar
- 17.American Association of State High and Transportation Officials. LRFDSI-3, AASHTO LRFD Bridge design specifications, 2004. 96–98Google Scholar