Gradient Material Stress Arch Replacement Simulation Of Stress Concentration Areas

Arch dam is a complex geometry of the space shell structure occupies a very prominent position in the construction of water conservancy and hydropower reasonable structure, beautiful body, safe, economic advantages, it is widely used at home and abroad. During operation, due to changes in the outside temperature, inside the dam will produce temperature load. Temperature rises, the temperature load the dam internal compressive stress becomes large, the temperature drops, the dam internal tensile stress will increase. The tensile strength of concrete is much lower than the compressive strength, Therefore, the temperature drop, the dam due to tensile stress exceeds the tensile strength of concrete cracks, affecting the safety of the dam. In this paper, several replacement concrete solutions to improve the tensile stress state, and to study the replacement of the relationship between the elastic modulus and stress state of the concrete.Analysis on stress analysis methods arch cantilever Method with Finite Element Method. In theory, the finite element method than the arch cantilever load method to improve and state-of-the-art, is a relatively accurate numerical methods. The calculation of the finite element method is also superior to the method of structural mechanics, can handle the many arch cantilever Method difficult to deal with the problem; consider arch dam in stiffness between the foundation and the dam between; analog hole, complex based on gravity pier irregular shape; also simulate the arch dam construction and operation process. Many projects at home and abroad, using the finite element method analysis of dam stability, strength, and has accumulated a large number of concrete arch dam stress analysis experience. With the the arch dam large number of construction and development, the application of the finite element method more and more extensive and in-depth, it will eventually replace the multi-arch beam method, the main method for arch dam design.In this paper, an arch dam model, for example, low elastic modulus of high-strength concrete partial replacement of concrete (high-strength low elastic modulus of concrete replacement dam large area concrete tensile stress), to finite element ANSYS10.0as a platform, arch the dam model division unit with SOLID226 unit, direct coupling method analysis on stress. Paper compares the temperature rise and temperature drop stress distribution, the tensile stress maximum temperature drop conditions for replacement effect conditions, by replacing the concrete program comparison, the change of the elastic modulus stress relationship, and proposed the elastic modulus replacement scope and Standards, as an engineering example to provide a reference standard.