通过对大量计算结果的研究，得出了几种跨度下立体钢桁架及立体预应力钢桁架的最优高度。
By study of large amount of computational results, the optimal heights of space steel trusses and space prestressed steel trusses of several spans are got.
目的利用灰色层次分析法合理评估大跨度桥梁施工过程中的多种风险和确定最优施工方案。
Risk assessment is made in the paper for long span bridge construction and the best construction document by "AHP-GRAY" is determined.
实验结果表明，该策略高效合理，能够缩减执行任务的时间跨度，并提高最优解的质量。
Experimental results prove the strategy has better performance. It can be faster to get a high-quality optimal solution.
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