Abstract: In light of the actual project，this article established fuzzy evaluation model of long-span steel truss construction scheme optimization. According to the project survey and the index-built principles，this article established the evaluation index system through the improved AHP method to determine the weight of each evaluation index and classified the evaluation index level. Making feasible construction schemes，introducing of set-valued statistical method to construct the membership matrix，and using the theory of fuzzy mathematics to calculate the comprehensive superior values of schemes，this article ranked the values，then determined the optimized scheme.

Key words: fuzzy evaluation, AHP method, improvement, set-valued statistics

摘要： 结合实际工程，建立大跨度钢桁架施工方案优选的模糊评判模型。根据工程概况及指标建立原则，建立评价 指标体系，通过改进的层次分析法确定各指标的权重，划分评价指标等级。编制可行的多种施工方案，引入集值统 计的方法来构建隶属度矩阵，利用模糊数学原理计算各方案的综合优越度。对各方案评价值进行排序，从而确定 最佳方案。

关键词: 模糊评判, 层次分析法, 改进, 集值统计