关键词: 桥梁工程, 桥梁方案, 加权秩和比法, 云理论, 熵值法

Abstract: In order to solve the problem that bridge construction scheme mostly relied on subjective experience of experts  judgment and selection model of common bridge construction schemes was complex and cumbersome, the optimization model of bridge construction scheme based on weighted rank sum ratio (RSR)method was proposed. Firstly, the construction index system of bridge was built on the basis of consulting experts, senior designers and construction workers, and cloud theory was used to achieve quantitative transformation of qualitative indicators of each plan. Then, the entropy weight method was used to determine the index weight of the construction scheme. Finally, the weighted RSR model based on entropy method was established; and the construction schemes of bridge were sorted and divided into files to select out the optimal one. Cloud theory could achieve the quantitative transformation of qualitative indicators, which could fully consider the fuzziness and randomness of experts understanding of qualitative indicators. The entropy weight method was used to determine the weight of the scheme index, which could effectively avoid the subjective problem. The proposed weighted RSR model had advantages such as simple calculation process, no consideration of the index dimension as well as fast and reliable scheme selection. Through the example analysis, the results show that the proposed model can not only simplify the selection of bridge construction scheme but also effectively improve the objectivity of the scheme screening.

Key words: bridge engineering, bridge scheme, weighted rank sum ration method, cloud theory, entropy method