【作者】 安蕊梅； 段树金； 刘维华；

【Author】 AN Rui-mei, DUAN Shu-jin, LIU Wei-hua(School of Civil Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043,China; Department of professional technology, Shijiazhuang Railway Institute, Shijiazhuang 050043,China)

【机构】 石家庄铁道学院土木工程分院； 石家庄铁道学院职业技术分院；

【摘要】 介绍一种以结构自振周期平方和最小为优化目标的新的动力优化设计方法,其最大特点是不用求特征值,设计的结构为刚性结构。使用这种方法对等截面斜腿刚构桥进行了几何布局的动力优化,以斜腿倾角和分跨比为设计变量,以设计变量的界限约束和体积一定为约束条件,采用了直接搜索法中的网格搜索法寻优。算例表明,这种优化方法简单、有效,设计所得的等截面斜腿刚构桥布局合理,结构刚度大。更多还原

【Abstract】 A new dynamic optimum design method to minimize the square sum of the natural periods is introduced, which is not necessary to compute the eigenvalues, and the designed structures can be considered as a stiffness one. The method is used to optimize dynamically the layout of rigid frame-bridge with the inclined piers with the uniform cross section. Inclined angle of the piers and the span ratio are taken as design variables, and the direct search method called net check search is used to search the most optimum value under the constant volume and the limits of variables. The numerical result shows that the optimum method is simple and effective, the designed rigid frame-bridge with inclined piers is much stiff with good layout.更多还原