Need to consider the various influences, such as function, technique, economy,beauty and society...etc. and their mutually effect, when the bridge constructionproject optimization. Passing to the comprehensive discussion of each aspect, putforward to a few feasible projects, and make use of the fuzzy comprehensiveevaluation and the grey system theories to analysis the every factor, thus carrying onthe optimization in various project. First analyzes and studies fuzzy comprehensiveevaluation method and grey system theories, tallying up the basic step of the twokinds of theories, and make sure the adjudication model of two kinds of theories.Analyzed to the influence factors of determination and indetermination in theoptimization process of bridge designing the project, and assurance the economictechnique factors in the optimization process of bridge designing the project. Basedon fuzzy mathematics, establishes a model of multi-target decision by the method ofcombining quantitative with qualitative analysis, and selects the optimal project bythe comprehensive evaluation, Make use of the gray system theories, make therelatively importance degree get the embodiment between each influence factor,make the conclusion of the bridge project optimization more reasonable through thegrey connection analysis. Combined the engineering example, considers theinfluence of various factors in the process of the project, carrying on fuzzycomprehensive evaluation and grey connection analysis, and getting the result of thebest bridge construction project. Compared to the analysis result of two kinds oftheorieses , get the conclusion in accordance with the practical engineering, andcan raise the economic and social benefit, certainly have practical value. It will getthe extensive application in bridge optimization and provide the gist of credibilitytheory and the realization means along with the kind of model gradually sum-up andfurther perfect in practice.
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