Simulation Analysis Of Temperature Effects For Double-limb High Pier With Thin–Walled Sections

With the rapid development of the highway and high-speed railway construction, the bridge traffic construction extends to the mountain valleys gradually. In mountain valleys, high pier and long span continuous rigid frame bridge is a very competitive bridge. The double-limb thin-walled pier’s mechanical characteristics consistent with the pier of this type, which causes that it gets a lot of applications. And in mountain valleys, the sunshine temperature difference is generally large, the thin-walled concrete structure is also relatively more sensitive to temperature changes. Therefore, the study on the temperature field and the temperature difference of double-limb thin-walled hollow high pier is very important and scientific.In this paper, the MingShui bridge’s 105.09 m double-limb and other section of the rectangular hollow pier and the HePingXia bridge’s 40.0m double-limb and other crosssection of the rectangular entities pier of XingFen High Way as the research object, testing and analyzing their temperature field, at the same time, this thesis uses secondary development function of ANSYS finite element software to developed a special program for the double-limb thin-walled hollow pier’s temperature field calculation,and using this program to simulate, calculate and analyze its temperature field. The measured and calculated values are compared, verifying whether the results of the secondary development is accurate and reliable.Using the development program to analyze simulately these two bridges. The results proved that the thermal stresses and deformations of double-limb pier structures which is induced by solar temperature load is comparatively large, and can not be ignored. Meanwhile, the temperature field distribution of double-limb thin-walled pier is obtained.In addition, this thesis analyzes and calculates the impact on the temperature field when the double-limb thin-walled pier change cross-sectional shape, boundary conditions and the pier wall thickness, and summing up the impact of solar temperature load on the high pier of long span bridge structures,and giving some good advice to reduce the thermal stress and displacement as well as cracks in the top pier. The results can provide a reference for the design and construction of this type of bridge piers.