斜拉索管桥的模糊优化设计

建立了斜拉索管桥的非对称模糊优化模型.在该模型中作者考虑了设计人员在选取设计系数和确定地基承载能力时的主观不确定性因素.通过采用三级模糊综合评判方法对优化模型中的模糊因素进行综合评定,不仅使工程设计人员的实践经验在斜拉索管桥的方案设计中得到了定量反映,而且将斜拉索管桥的非对称模糊优化模型转化为普通优化模型,从而使处理斜拉索管桥普通优化设计的优化方法同样适用于解决斜拉索管桥的模糊优化设计问题.所给算例表明,采用模糊优化设计方法得到的斜拉索管桥设计方案在技术上更为可靠,经济上更加合理.

FUZZY OPTIMUM DESIUN OF CABLE-STAYED PIPE BRIDGES

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.