Abstract
An accurate prediction of temperatures of parallel wire strands is essential to determine the fire-induced mechanical responses of cable-supported bridges. In this paper, the theoretical formula applicable to the temperature field calculation of parallel wire strand sections is established based on the basic theory of heat transfer, and its accuracy is verified. An equivalent steel round bar numerical model of the parallel wire strand is established, and the temperature history of the parallel wire strand section under ISO834 fire is analyzed using the theoretical formula and the equivalent steel round bar numerical model. The results show that the heating law of each layer steel wires of the parallel wire strand section is basically the same and all have a tendency to approach the fire source temperature with the increase of fire time. Due to the existence of thermal resistance, large temperature gradients occur in the parallel wire strand sections. The temperature field of the parallel wire strand section shows more significant inhomogeneous distribution than that of its equivalent steel round bar section due to the influence of the cavities. It indicates that the traditional equivalent steel round bar model does not genuinely reflect the inhomogeneous temperature rising characteristics of the parallel wire strand section. The temperature of the surface layer steel wires of the parallel wire strand section and its equivalent steel round bar section is very close. In contrast, the temperature difference of the inner steel wires is significant, i.e., the parallel wire strand section has a larger temperature gradient than its equivalent steel round bar section.
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References
ANSYS Inc. (2009) Release 18.0 documentation for ANSYS. ANSYS Inc., Canonsburg, PA, USA
Bennetts I, Moinuddin K (2009) Evaluation of the impact of potential fire scenarios on structural elements of a cable-stayed bridge. Journal of Fire Protection Engineering 19(2):85–106, DOI: https://doi.org/10.1177/1042391508095091
CECS 200:2006 (2006) Technical code for fire safety of steel structure in building. CECS 200:2006, China Planning Press, Beijing, China
Du Y, Sun YK, Jiang J, Li GQ (2019) Effect of cavity radiation on transient temperature distribution in steel cables under ISO834 fire. Fire Safety Journal 104:79–89, DOI: https://doi.org/10.1016/j.firesaf.2019.01.002
EN 1991-1-2 (2002) General actions-actions on structures exposed to fire.
Fank PI, David PD (2002) Fundamentals of heat and mass transfer, fifth edition. John Wiley & Sons, Inc., Hoboken, NJ, USA, 822–839
Fontanari V, Benedetti M, Monelli BD, Degasperi F (2015) Fire behavior of steel wire ropes: Experimental investigation and numerical analysis. Engineering Structures 84(3):211–223, DOI: https://doi.org/10.1016/j.engstruct.2014.12.004
Gong X, Agrawal AK (2014) Numerical simulation of fire damage to a long-span truss bridge. Journal of Bridge Engineering 20(10), DOI: https://doi.org/10.1061/(ASCE)BE.1943-5592.0000707
Hou X, Zheng W, Kodur V, Sun H (2014) Effect of temperature on mechanical properties of prestressing bars. Construction and Building Materials 61:24–32, DOI: https://doi.org/10.1016/j.conbuildmat.2014.03.001
Huo JS, Zhou ZJ, Jin B (2017) Experimental study on combustion performance of steel cable and high temperature mechanical property of steel strand. Journal of Highway and Transportation Research and Development 34(08):91–97
Kodur VKR Naser MZ (2015) Effect of local instability on capacity of steel beams exposed to fire. Journal of Constructional Steel Research 111:31–42, DOI: https://doi.org/10.1016/j.jcsr.2015.03.015
Kotsovinos P, Atalioti A, McSwiney N, Lugaresi F, Rein G, Sadowski AJ (2020) Analysis of the thermomechanical response of structural cables subject to fire. Fire Technology 56(2):515–543, DOI: https://doi.org/10.1007/s10694-019-00889-7
Li YQ, Ma DZ, Xu J (1991) Fire protection design calculation and structure treatment of building structure. China Building Industry Press, Beijing, China, 47–52
Lugaresi F (2017) Thermal response of structural spiral strands subject to fire. BEng Thesis, The University of Edinburgh, Edinburgh, UK
Ma ML, Ma RJ, Chen AR (2014) Safety of cables and full structure of a cable-stayed bridge exposed to fires on deck. Journal of South China University of Technology (Natural Science Edition) 42(10):117–124, DOI: https://doi.org/10.3969/j.issn.1000-565X.2014.10.019
Naser MZ, Kodur VKR (2016) Factors governing onset of local instabilities in fire exposed steel beams. Thin-Walled Structures 98:48–57, DOI: https://doi.org/10.1016/j.tws.2015.04.005
Shakya AM, Kodur VKR (2016) Effect of temperature on the mechanical properties of low relaxation seven-wire prestressing strand. Construction and Building Materials 124:74–84, DOI: https://doi.org/10.1016/j.conbuildmat.2016.07.080
Sun GJ, Li XH, Xue SD, Chen RH (2019) Mechanical properties of Galfan-coated steel cables at elevated temperatures. Journal of Constructional Steel Research 155:331–341, DOI: https://doi.org/10.1016/j.jcsr.2019.01.002
Wang Y, Liu MY (2016) Fire resistance simulation of main cable and sling for long-span suspension bridge. Journal of Central South University (Science and Technology) 47(06):2091–2099, DOI: https://doi.org/10.11817/j.issn.1672-7207.2016.06.037
Zhang XM, Ren ZP (2006) Heat transfer. China Building Industry Press, Beijing, China, 28–40
Zhong T (2015) Mechanical properties of prestressing steel after fire exposure. Materials and Structures 48(9):3037–3047, DOI: https://doi.org/10.1617/s11527-014-0377-5
Zhou H, Du Y, Li GQ, Liew JY Richard, Wang XC (2018) Experimental study on thermal expansion and creep properties of pre-stressed steel strands at elevated temperature. Engineering Mechanics 35(06):123–131, DOI: https://doi.org/10.6052/j.issn.1000-4750.2017.02.0155
Zhou HT, Li SY, Chen L, Zhang C (2018) Fire tests on composite steel-concrete beams prestressed with external tendons. Journal of Constructional Steel Research 143:62–71, DOI: https://doi.org/10.1016/j.jcsr.2017.12.008
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The authors gratefully acknowledge the support by the National Natural Science Foundation of China (51178396/E080505), and the Guangdong Basic and Applied Basic Research Foundation (2020A1515110240).
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Chen, W., Shen, R. Study of Temperature Field Inhomogeneities in Parallel Wire Strand Sections under ISO834 Fire. KSCE J Civ Eng 25, 3940–3952 (2021). https://doi.org/10.1007/s12205-021-0062-5
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DOI: https://doi.org/10.1007/s12205-021-0062-5