Abstract
In order to study the effect of temperature difference load (TDL) along the vertical direction of a simply supported beam bridge section on the vertical irregularity, a rail-bridge-piers calculation model was established. Taking 32 m simply supported box beam bridge which is widely used in the construction of passenger dedicated line in China as an example, influences of the temperature variation between the bottom and top of the bridge, temperature curve index, type of temperature gradient, and beam height on track vertical irregularity were analyzed with the model. The results show that TDL has more effects on long wave track irregularity than on short one, and the wavelength mainly affected is approximately equal to the beam span. The amplitude of irregularity caused by TDL is largely affected by the temperature variation, temperature curve index, and type of temperature gradient, so it is necessary to monitor the temperature distribution of bridges in different regions to provide accurate calculation parameters. In order to avoid the irregularity exceeding the limit values, the height of 32, 48, and 64 m simply supported box beam bridges must not be less than 2.15, 3.2, and 4.05 m, respectively.
Highlights
Supported beam bridges are widely used in the construction of passenger dedicated lines in China because of their characteristics of simple structure, clear path for force transfer, low cost, easy manufacturing and installing techniques [1, 2]
Taking 32 m supported box beam bridge which is widely used in the construction of passenger dedicated line in China as an example, influences of the temperature variation between the bottom and top of the bridge, temperature curve index, type of temperature gradient, and beam height on track vertical irregularity were analyzed with the model
This part mainly analyzes the effects of temperature variation, temperature curve index, type of temperature difference load (TDL), beam height, and beam span on the vertical displacement of rail and track irregularity caused by TDL
Summary
Supported beam bridges are widely used in the construction of passenger dedicated lines in China because of their characteristics of simple structure, clear path for force transfer, low cost, easy manufacturing and installing techniques [1, 2]. Temperature distribution along the vertical direction of a supported beam bridge section is nonuniform, which would cause warping deformation of bridge. The vertical displacement and longitudinal force both become large, and result in buckling of track Researchers such as Tao et al [7], Ye et al [8], and Lee [9] expatiated on the temperature distribution of bridge. Kumar et al [10] found that temperature difference load (TDL) could significantly increase the longitudinal force of rail under the assumption that temperature was distributed linearly along the vertical direction of a bridge section, and suggested that the impact of TDL should be considered into the design of CWR on bridge. Taking the 32 m supported box beam bridge as an example, the effect of TDL on the displacement of rail on bridge was investigated
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