An Equivalent Stress Analysis Method for the Whole Arch Dam

Abstract

The invention discloses a method for analyzing the equivalent stress of the whole body of an arch dam, which belongs to the technical field of hydropower station arch dam design, and provides a method for analyzing the equivalent stress of the whole body of an arch dam that can realize fast calculation and processing, including the following steps : Step 1, carry out finite element calculation of arch dam stress; Step 2, establish arch beam grid; Step 3, calculate geometric parameters of arch beam grid nodes; Step 4, interpolate to obtain the stress of arch beam grid nodes; Calculate the equivalent stress. Aiming at the finite element calculation results obtained by a large number of calculation conditions and schemes of complex calculation models in arch dam design, the analysis method of the present invention adopts the arch beam grid as the interpolation grid on the basis of the finite element calculation result data, and interpolates The nodes in the grid are used as nodes for subsequent equivalent stress calculations to achieve fast, practical and stable equivalent stress analysis and calculation, and effectively solve the problem of quantitative evaluation of finite element results in arch dam design.

Description

technical field [0001] The invention relates to the technical field of hydropower station arch dam design, in particular to an equivalent stress analysis method for the entire body of an arch dam. Background technique [0002] The arch dam is a high-order statically indeterminate structure, and the stress of the dam body is very sensitive to the influence of boundary conditions. Compared with structural mechanics methods such as the pure arch method and the arch-beam load sharing method, the finite element method can consider large openings and irregularities in the dam body. Shape (such as flow weir), interaction between arch dam and bedrock, complex foundation and other factors, and the calculation accuracy of finite element method is high. However, in the elastic range, the finite element calculation results show stress concentration at the corners of the dam heel and dam toe, and the denser the grid, the higher the stress concentration, which is not conducive to determin...

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Problems solved by technology

2. The complexity of the research models is different; the finite element calculation grids used in scientific research results are mostly regular, and the actual calculation grids used in engineering design need to take into account the complex dam structure and basic geological conditions, and most of the grids are very irregular. It is difficult to apply the method of scientific research results to the simplified model to the actual engineering complex model

3. The amount of calculation is different, and scientific research results generally only select typical sections of typical working conditions for in-depth research, while actual engineering calculations need to consider a large number of different calculation schemes and calculation conditions, the calculation amount is very large, and fast, practical and stable analysis is required method

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