基于遗传算法的钢管混凝土拱桥拱肋吊装优化研究-结构工程专业论文.docxVIP

武汉理工大学硕上学位论文摘要 武汉理工大学硕上学位论文 摘要 大跨度钢管拱桥的拱肋吊装过程是’个复杂的过程，为了保证最终的成 桥状态满足设计要求，考虑扣索索长的调整方法，确定出施工各阶段的合理 状态是很有必要的。 本文针对大跨度钢管拱桥合理成桥状态的确定和扣索索长调整问题，将 改进的遗传算法嵌入到拱肋吊装的结构计算中，采用实数编码技术，引入了 基于排序的适应度分配选择方式，将动态罚函数法应用于处理有约束的最优 化问题。为了满足大跨度钢管混凝土拱桥施工的安全性与成桥预期的内力状 态和拱肋线形，本文结合工程实例，分别对合理成桥状态和扣索索长调整的 目标函数的确定进行了分析，将一组多变量、多约束的最小化问题无约束化， 从而建立起适合于该问题的遗传算法优化模型，将其计算结果分别与迭代前 进法和随机最优控制理论进行了比较；结果表明，采用该方法编制的基于结 构计算的遗传优化程序操作灵活，能很好的满足施工和设计要求。 本文的研究是一种全新的智能计算理论在桥梁施工控制领域中的应用， 对于促进施工控制技术的发展，实现大跨度钢管混凝土拱桥的施工控制是十 分必要和有意义的，并能在其它桥种的施工控制中提供参考。 关键词：钢管混凝土拱桥，遗传算法，实数编码， 合理成桥状态，扣索索长调整 武汉理工大学磷十学位论文Abstract 武汉理工大学磷十学位论文 Abstract Rib-hoisting of the long-span CFST arch bridge is very complex．In order that the finished state of structure meets the design requirement it is necessary to study the method of buckle—cable adjusted and determine reasonable finished state． In this paper improved genetic algorithm is combined witll computation of buckle-cable adjusted．And the genetic optimization model based on real number encoding is introduced．In the established model，rank—based fitness assignment selection and dynamic penalty strategy are introduced to handling restriction problems．In order to assure that the stress and strain state of structure is secure， the author analyses respectively the objective functions ofthe reasonable finished state and buckle—cable adjusted phase；thus，the optimized model based Oll FGA is framed．Finally according to the example，the computation datum are compared witIl the iterative forward analysis method and the optimal control theory The result shows that this method earl be used conveniently and meet the construction and design precision． The research is an application of new intelligent computation theory in the construction control field of bridges．It is very essential and significative for the development of construction control technology of CFST．Furthermore，it has great reference value for the construction control ofother kinds ofbridges． Keywords：CFST arch bridge，genetic algorithm，real numb