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首页> 外文会议>International Structural Engineering and Construction Conference(ISEC-03); 20050920-23; Shunan(JP) >An optimal design method for the layout of slant-legged rigid frame bridge
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An optimal design method for the layout of slant-legged rigid frame bridge

机译：斜腿刚架桥布置的优化设计方法

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摘要

The optimal design problem for the layout of a slant-legged rigid frame bridge is studied in this paper. The inclined angle of the leg and the span ratio of the main girder are taken as the design variables with the constant volume of the structural materials and across a V-shaped canyon. In the static problem, an optimum layout of the bridge is obtained by minimization to the average of the square sum of stresses. While as a dynamic optimum design method, the square sum of the natural periods is minimized, which is not necessary to compute the eigenvalues. The direct search method is used to search the most optimum value under the constraint condition and the limits of variables. Some numerical examples show that the proposed optimum method is simple and effective, the designed slant legged-rigid frame bridge with the uniform areas is much stiff with good layout in practice.
机译：研究了斜腿刚构桥布置的最佳设计问题。腿的倾斜角度和主梁的跨度比被视为设计变量，结构材料的体积恒定，并且横跨V形峡谷。在静态问题中，通过最小化应力平方和的平均值来获得桥的最佳布局。作为一种动态优化设计方法，自然周期的平方和被最小化，这对于计算特征值不是必需的。直接搜索方法用于在约束条件和变量限制下搜索最佳值。数值算例表明，所提出的优化方法简单有效，所设计的斜腿刚构斜桥结构刚度大，布局合理。

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