Span Matching and Condition Optimization Method for Railway Bridges Based on Standard Spans

Railway bridges have a long length with multiple crossing control factors. During the use of standard beam span design, in order to solve the problem of matching and optimizing the entire bridge span, an integer linear programming model was established with the sum of the importance coefficients of the beam span as the objective function and roads, rivers, and pipelines as constraints. A recursive solution method was proposed, which was arranged in zones according to the constraints before being merged one by one. The results show that in the face of large-scale optimization mathematical models, by defining parameters such as the lower limit of the span length, the upper limit of the span length, and modifying the span length, the relationship between constraint conditions is established. The computational dimension of the model is reduced to achieve the recursive solution process, thereby saving.the solution time. The application of this method to the design of multiple high-speed railway bridges helps overcome the problem of automated design of railway bridge schemes, solving the problem of accurate calculation of efficient and economical layout of spans of long bridges, achieving optimal matching between beam spans and roads, rivers, and pipelines. © 2023 Science Press. All rights reserved.