Refined 3D Solar Temperature Field and Effect Simulation of Ultra-High Steel Bridge Pylon

In order to accurately calculate the sunshine-induced temperature effect of an ultra-high bridge pylon, a refined numerical simulation model for 3D field was established based on proposed automatic sunshine shadow recognition method and pylon-height-related convection modification method. A suspension H-shaped pylon with height 280 m taken as example, corresponding thermal stress deformation were calculated under typical meteorological conditions in spring, summer, autumn, winter. The results show that maximum differences between outer surfaces can reach 19 °C 16 north–south walls east–west walls, respectively, exceed recommended value ±5 Chinese Specification. displacements 370 mm 110 at top longitudinal transverse directions bridge, respectively. After convective coefficient different wind speeds heights, gradually decreased from bottom difference 8 °C. significant influence shown pylon. By considering effect, 12 adjacent sunlit shaded areas 14 two columns. mutation existed area, could be reduced by 13 MPa compared area. Obvious asynchronous columns, displacement 18 45 directions,