正交异性钢桥面系的多目标离散优化设计

Multi-objective discrete optimization of the orthotrop steel bridge deck surfacing system

将大跨径钢桥的正交异性钢桥面板和其上的铺装层作为钢桥面铺装体系整体进行多目标优化设计。取钢桥面铺装体系结构总重量最轻及铺装层使用年限最长两类指标构造目标函数,在此基础上采用功效函数法确定了目标函数的权重系数。应用正交异性钢桥面系力学性能控制指标和疲劳寿命预测公式,建立多目标优化设计的数学模型。引入蚂蚁算法,开发了钢桥面铺装体系结构多目标离散优化设计程序。以国内某大跨径钢桥为对象,采用多目标优化设计方法,给出钢桥面铺装体系中各参数的优化值。结果表明,应用多目标优化设计方法对大跨径钢桥面铺装体系设计是可行的。研究成果可为大跨径钢桥面铺装体系结构的设计提供理论依据。

This study is concerned with the multiple objective optimum designs of long-span orthotropic steel bridge deck and its surfacing system. The minimum weight of the surfacing system and the maximum work-life of pavement are selected as the design objectives. Each object weight factor is ensured by the way of efficacy function. Based on formulas of mechanical control indexes and fatigue life forecast, the mathematical model for multiple objective optimum designs is established. A new heuristic algo- rithm, Ant algorithm, is introduced to the structural optimization problem,and a multiple objective discrete optimization design program for the orthotropic steel bridge deck surfacing system is developed. The optimization values of parameters for steel bridge surfacing system are obtained through multipleobjective optimal design for a long-span steel bridge in China. The multiple-objective optimum design of long-span steel bridge surfacing system is proven to be reasonable and may be used to provide a theoretical basis for the design of the surfacing system of large-span steel bridges.