Numerical calculation on solar temperature field of a cable-stayed bridge with U-shaped section on high-speed railway

Abstract

Based on transient temperature field theory of heat conduction, the solar temperature field calculation model of U-shape sectioned high-speed railway cable-stayed bridge under actions of concrete beams and ballast was established. Using parametric programming language, finite element calculation modules considering climate conditions, bridge site, structure dimension and material thermophysical properties were compiled. Six standard day cycles with the strongest yearly radiation among the bridge sites were selected for sectional solar temperature field calculation and temperature distributions under different temperature-sensitive parameters were compared. The results show that under the influence of sunshine, U-shape section of the beam shows obvious nonlinear distribution characteristics and the maximum cross-section temperature difference is more than 21 °C; the ballast significantly reduces sunshine temperature difference of the beam and temperature peak of the bottom margin lags with the increase of ballast thickness; the maximum cross-section vertical temperature gradient appears in summer while large transverse temperature difference appears in winter.

Keywords

high-speed railway / cable-stayed bridge / U-shaped section / solar temperature field / thermal analysis

References

[1] SunD-xAdvanced heat transfer-Numerical simulation and analysis of heat conduction and convection [M], 2005, Beijing, China Architecture & Building Press: 3-15

[2] ElbadryM, GhaliA. Temperature variations in concrete bridges [J]. Journal of Structural Engineering, ASCE, 1983, 109(10): 2355-2374

[3] PengY-s, QiangS-z, LiSong. Temperature distributions in dumbbell cross section concrete-filled steel tube arches due to solar radiation [J]. China Railway Science, 2006, 27(5): 71-75

[4] BrancoF A, MendesP A. Thermal actions for concrete bridge design [J]. Journal of Structural Engineering, 1993, 119(8): 2313-2331

[5] LeeJ-Han. Investigation of extreme environmental conditions and design thermal gradients during construction for prestressed concrete bridge girders [J]. Journal of Bridge Engineering, 2012, 17(3): 547-556

[6] KehlbeckFInfluence of solar radiation on the bridge structure [M]. LIU Xing-fa, translated, 1981, Beijing, China Railway Publishing House: 29-36

[7] GuoJian. Analysis of unsteady temperature gradient and thermal stress field for concrete girder of cable-stayed bridge [J]. China Journal of Highway and Transport, 2005, 18(2): 65-68

[8] HattelJ H, ThorborgJ. A numerical model for predicting the thermomechanical conditions during hydration of early-age concrete [J]. Applied Mathematical Modeling, 2003l-26

[9] XiaY-m, XueJ, YaoP-p, JiZ-yong. Transient calculation of temperature field and stress field for high-speed electric multiple units brake disc [J]. Journal of Central South University (Science and Technology), 2010, 41(4): 1334-1339

[10] FangX-jin. A survey of the atmospheric trans-parency coefficients over china [J]. Journal of Nanjing Institute of Meteorology, 1985, 8(3): 293-305

[11] GuoQ-w, FangZ, PeiB-z, DengH, LiuG-dong. Temperature effect analysis of concrete cable-stayed bridge [J]. China Journal of Highway and Transport, 2002, 15(2): 48-51

[12] XuFengStudy on the key factors of temperature effect of concrete box-girder bridges [D], 2009, Wuhan, Huazhong University of Science & Technology

[13] MaseM A, DilgerW H, BallykP D. Extreme values of thermal loading parameters in concrete bridges [J]. Canadian Journal of Civil Engineering, 1992, 19(6): 935-946

[14] CarinL. Measurements of thermal gradients and their effects in segmental concrete bridge [J]. Journal of Bridge Engineering, ASCE, 2002, 7(3): 116-174

[15] Code for design of railway CWR (draft) [S]. Beijing: Institute of Economic Planning Ministry of Railways, 2008. (in Chinese)