Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

An experimental and numerical study on temperature gradient and thermal stress of CFST truss girders under solar radiation

  • Peng, Guihan (School of Civil Engineering, Fuzhou University) ;
  • Nakamura, Shozo (Department of Civil Engineering, Nagasaki University) ;
  • Zhu, Xinqun (School of Computing, Engineering and Mathematics, Western Sydney University) ;
  • Wu, Qingxiong (School of Civil Engineering, Fuzhou University) ;
  • Wang, Hailiang (Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University)
  • Received : 2017.07.25
  • Accepted : 2017.08.19
  • Published : 2017.11.25
⟨ Previous Next ⟩

Abstract

Concrete filled steel tubular (CFST) composite girder is a new type of structures for bridge constructions. The existing design codes cannot be used to predict the thermal stress in the CFST truss girder structures under solar radiation. This study is to develop the temperature gradient curves for predicting thermal stress of the structure based on field and laboratory monitoring data. An in-field testing had been carried out on Ganhaizi Bridge for over two months. Thermal couples were installed at the cross section of the CFST truss girder and the continuous data was collected every 30 minutes. A typical temperature gradient mode was then extracted by comparing temperature distributions at different times. To further verify the temperature gradient mode and investigate the evolution of temperature fields, an outdoor experiment was conducted on a 1:8 scale bridge model, which was installed with both thermal couples and strain gauges. The main factors including solar radiation and ambient temperature on the different positions were studied. Laboratory results were consistent with that from the in-field data and temperature gradient curves were obtained from the in-field and laboratory data. The relationship between the strain difference at top and bottom surfaces of the concrete deck and its corresponding temperature change was also obtained and a method based on curve fitting was proposed to predict the thermal strain under elevated temperature. The thermal stress model for CFST composite girder was derived. By the proposed model, the thermal stress was obtained from the temperature gradient curves. The results using the proposed model were agreed well with that by finite element modelling.

Keywords

Acknowledgement

Supported by : Technology Development Foundation of Fuzhou University

References

  1. Abid, S.R., Taysi, N. and Ozakca, M. (2016), "Experimental analysis of temperature gradients in concrete box-girders", Constr. Build. Mater., 106(1), 523-532. https://doi.org/10.1016/j.conbuildmat.2015.12.144
  2. British Standards Institution (BSI) (2006), BS 5400-2: Steel, Concrete and Composite Bridges-Part 2: Specification for Loads, London, U.K.
  3. Chen, B., Sun, Y.Z., Wang, G.J. and Duan, L.Y. (2014), "Assessment on time-varying thermal loading of engineering structures based on a new solar radiation model", Math. Prob. Eng.
  4. Chitawadagi, M.V. and Narasimhan, M.C. (2009), "Strength deformation behaviour of circular concrete filled steel tubes subjected to pure bending", J. Constr. Steel Res., 65(8-9), 1836-1845. https://doi.org/10.1016/j.jcsr.2009.04.006
  5. European Committee for Standardisation (2003), EN1991-1-5: Eurocode 1: Actions on Structures-Part 1-5: General Actions-Thermal Actions.
  6. Giussani, F. (2009), "The effects of temperature variations on the long-term behaviour of composite steel-concrete beams", Eng. Struct., 31(10), 2392-2406. https://doi.org/10.1016/j.engstruct.2009.05.014
  7. Kim, S.H., Park, S.J., Wu, J.X. and Won, J.H. (2015), "Temperature variation in steel box girders of cable-stayed bridges during construction", J. Constr. Steel Res., 112, 80-92. https://doi.org/10.1016/j.jcsr.2015.04.016
  8. Kuranovas, A. and Kvedaras, A.K. (2007), "Behaviour of hollow concrete-filled steel tubular composite elements", J. Civil Eng. Manage., 8(2), 131-141.
  9. Lee, J.H. (2012), "Investigation of extreme environmental conditions design thermal gradients during construction for prestressed concrete bridge girders", J. Brid. Eng., 17(3), 547-556. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000277
  10. Li, D.N., Maes, M.A. and Dilger, W.H. (2004), "Thermal design criteria for deep pre-stressed concrete girders based on data from confederation bridge", Can. J. Civil Eng., 31(5), 813-825 https://doi.org/10.1139/l04-041
  11. Lin, Y.P. (2007), Engineers' Handbook for Bridge Design, China Communication Press, Beijing, China.
  12. Long, P.H., Zhang, M.H. and Chen, W.Z. (2010), "Analysis of temperature stress for concrete box girders cracking", Proceedings of the International Conference on Mechanic Automation and Control Engineering (MACE).
  13. Macorinia, L., Fragiacomo, M., Amadioa, C. and Izzuddinc, B.A. (2006), "Long-term analysis of steel-concrete composite beams: FE modeling for effective width evaluation", Eng. Struct., 28(8), 1110-1121. https://doi.org/10.1016/j.engstruct.2005.12.002
  14. Miao, C.Q. and Shi, C.H. (2013), "Temperature gradient and its effect on flat steel box girder of long-span suspension bridge", Sci. Chin. Technol. Sci., 56(8), 1929-1939. https://doi.org/10.1007/s11431-013-5280-8
  15. Mirambell, E. and Costa, J. (1997), "Thermal stresses in composite bridges according to BS5400 and EC1", Proceedings of the Institution of Civil Engineers: Structures and Buildings, 122(3), 281-292. https://doi.org/10.1680/istbu.1997.29799
  16. Peng, G.H., Mu, T.M. and Chen, B.C. (2012), "Experimental research on flexural behavior of CFST composite truss girder", J. Harbin Inst. Technol., 44(1), 91-94.
  17. Ranzi, G. and Bradford, M.A. (2007), "Composite beams with both longitudinal and transverse partial interaction subjected to elevated temperatures", Eng. Struct., 29(10), 2737-2750. https://doi.org/10.1016/j.engstruct.2007.01.022
  18. Shang, C.L. and Liu, W.F. (2012), "Temperature stress analysis of pre-stressed concrete box girder with corrugated steel webs", Trans. Tianjin Univ., 18, 97-103. https://doi.org/10.1007/s12209-012-1626-8
  19. Song, Z.W., Xiao, J.Z. and Shen, L.M. (2012), "On temperature gradients in high-performance concrete box girder under solar radiation", Adv. Struct. Eng., 15(3), 399-415. https://doi.org/10.1260/1369-4332.15.3.399
  20. Su, Q., Yang, G. and Bradford, M.A. (2016), "Bearing capacity of perfobond rib shear connecters in composite girder bridges", J. Brid. Eng., 21(4), 06015009. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000865
  21. The Ministry of Transport of the People's Republic of China (MTPRC) (2004), General Code for Design of Highway Bridges and Culverts, China Communications Press, Beijing, China.
  22. Wang, J., Xu, Z., Fan, X. and Lin, J. (2016), "Thermal effects on curved steel box girder bridges and their countermeasures", J. Perform. Constr. Facilit., 04016091.
  23. Westgate, R., Koo, K.Y. and Brownjohn, J.M.W. (2015), "Effect of solar radiation on suspension bridge performance", J. Brid. Eng., 20(5), 04014077. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000668
  24. Zhang, L.Y., Li, Z.S. and Cheng, M.F. (1999), Concrete Filled Steel Tube Spatial Truss Composite Beam Structures, China Communication Press, Beijing, China.
  25. Zhou, G.D. and Yi, T.H. (2013), "Thermal load in large-scale bridges: A state-of-the-art review", J. Distribut. Sens. Netw., 9(12), 217983. https://doi.org/10.1155/2013/217983
  26. Zhou, L., Xia, Y., Brownjohn, J. and Koo, K. (2015), "Temperature analysis of a long-span suspension bridge based on field monitoring and numerical simulation", J. Brid. Eng., 21(1), 04015027. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000786
  27. Zichner, T. (1981), Thermal Effects on Concrete Bridges, CEB Enlarged Meeting-Commission 2-Pavia, 292-313.