关键词: 斜拉索管桥, 模糊优化设计, 模糊综合评判

Abstract: In this paper a model of non-axisymmetrical fuzzy optimization for cable-stayed pipe bridges is set up on the basis of previous results in the design and study.The designer's subjective uncertainties in choosing the design coefficient and determing the carrying capacity of the foundation are considered in this model.By using the third-rank fuzzy overall decision method to evaluate synthetically the fuzzy factors in the optimization model,not only the practical engineering experience is described quantitatively in the schematic design of cable-stayed pipe bridges,but also the model of nor-axisymmetrical fuzzy optimization for cable-stayed pipe bridges can be transferre;mto a common optimization model and an appropriate method dealing with the common optimization of cable-stayed pipe bridges can be applied to solving the problem of this paper.A given example shows that the design scheme of cable-stayed pipe bridges obtained by the fuzzy optimization method is technically more reliable and economically more reason-able.