型钢混凝土工作桥受力特性研究与结构优化

Mechanical Characteristics and Structural Optimization of Steel Reinforced Concrete Service Bridge

传统的钢筋混凝土结构由于自重较大,并不适用于大跨径工作桥。而型钢混凝土结构刚度大、延性好、自重较轻,十分适合大跨度结构,将其引入工作桥的设计以代替传统的钢筋混凝土结构是合理的。以某水利枢纽节制闸上中孔型钢混凝土工作桥为工程实例,对型钢几何尺寸对工作桥受力性能的影响开展研究,得出结论反馈实际设计工作,并在研究基础上采用遗传算法自编程序对工作桥的受力主梁进行结构优化,以取得更高的工程经济效益。

The traditional reinforced concrete structure is not suitable for the design of long-span service bridge due to its large dead weight.The steel reinforced concrete structure possesses the advantages of large rigidity,good ductility and light dead weight,rendering it highly suitable for large-span structure.It is reasonable to introduce it into the design of a working bridge as a replacement for the traditional reinforced concrete structure.In this paper,the mid-span steel concrete working bridge on the control gate of a water conservancy project was taken as an engineering example.At the same time,the influence of the geometric size of the section steel on the mechanical performance of the service bridge was studied,and the conclusion was drawn and fed back to the actual design work.On the basis of the research,the genetic algorithm was used to compile a program to optimize the structure of the stressed main beam of the working bridge,in order to achieve higher engineering economic benefits.