Study on Temperature Stress and Temperature Deformation of Rectangular Hollow Thin Wall High Pier of High-Speed Railway Bridge

摘要

The temperature stress and the pier top temperature deformation of high-speed railway rectangular hollow thin-walled high pier, caused by the Sunshine temperature difference and cold wave cooling effect are not good for the stability and safety of the bridge structure. In serious cases, it will cause engineering accidents. In order to study the distribution of temperature stress and temperature deformation, established a solid finite element analysis model, and the distribution and characteristics of the stress and deformation of pier under the influence of sunshine temperature difference and cold wave cooling are analyzed. The results show that under the longitudinal and transverse sunshine temperature, the concrete of the pier is mainly subjected to compression, and the maximum stress generally appears at the corners. Increasing the arc chamfer can effectively reduce the stress concentration phenomenon, the displacement of the pier top caused by the longitudinal sunshine temperature is small, and caused by the transverse sunshine temperature is large. under the load of cold wave, the outer wall of the pier is tensile stress and the inner is compressive stress, the maximum tensile stress at the outer wall exceeding the allowable tensile stress, in order to prevent concrete cracking, it is recommended to arrange sufficient horizontal and vertical steel bars on the outside. The pier top horizontal displacement caused by the cold wave is small can negligible, the research results can provide reference for the reliable design and safe construction of similar piers in the future.