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在抗震结构设计中,设防水平(设防烈度)的确定是一个重要的战略决策,而过去却只是根据少量的信息靠设计负责人“拍脑袋”决定的。本文综合利用模糊决策论和优化技术的概念提出了科学的决策方法。这个问题属于正式设计前的概念设计的范畴。这里还可以考虑一般设计中不易考虑的一些因素,如施工条件、结构工作环境、地基失效的可能性、结构平立面布置、计算方法的优劣等因素的影响。本文所提方法也适用于水工结构、抗风结构等的最优设防水平的决策。
In the design of seismic structures, the determination of the fortification level (fortification intensity) is an important strategic decision, but in the past it was decided on the basis of a small amount of information by the person in charge of the design to “pick the head”. In this paper, the concept of fuzzy decision-making theory and optimization technology is used to propose a scientific decision-making method. This issue falls into the category of conceptual design before formal design. Here also consider some factors that are not easy to consider in the general design, such as construction conditions, structural work environment, the possibility of foundation failure, the layout of the structure facade, the merits of the calculation methods and other factors. The method proposed in this paper is also applicable to the decision-making of the optimal fortification level of hydraulic structures and wind-resistant structures.