曲线钢箱梁桥优化设计的研究

发布时间：2018-08-22 16:54

【摘要】：随着社会的发展和科技的进步,城市主干路立交系统得到快速普及,在城市桥梁设计建设的飞跃发展过程中,曲线钢箱梁桥已被迅速推广。传统的曲线钢箱梁优化设计,路径大致是：假设方案(根据以往设计经验参考规范初拟的方案)—结构计算分析—验算(刚度、稳定性、强度)—微调设计方案。针对传统的设计过程,其初步拟定的设计方案比较重要,这对于刚步入设计行列、经验不足的设计师来说困难较大,并且不同设计者会得出不同结构或差异较大的设计方案,这些均跟不上现代社会对结构复杂、精度高、造价低桥梁的需求,导致设计工程微调次数增多、设计时间长、效率低、经济性差。因此,对曲线钢箱梁进行优化设计可对上述问题进行解决。本文在学习、研究曲线钢箱梁相关规范和文献的基础上,重点进行以及得出的内容如下所示：1、在详细阐述、验证混合整型二次规划方法的正确性之后,结合某三跨曲线钢箱梁桥工程实例,建立了曲线钢箱梁优化模型,运用MIQL算法,并利用FORTRAN语言和VB混合编程的模式,开发出本文核心部分：曲线钢箱梁桥自动优化设计系统。2、提取工程实例的优化结果,进行优化结果和过程分析；借助Midas软件建立优化结果有限元模型,最后进行相关的计算结果验算；引入安全储备因子k,对优化前后Midas模型计算结果进行计算分析。上述内容验证了该自动优化设计系统的可行性、合理性与正确性,说明采用混合整型二次规划法优化程序可以对曲线钢箱梁进行有效的优化设计研究、达到节省造价的目的。3、最后对加劲肋厚度、横隔板间距以及梁高进行计算分析,并提出性价比值数x的概念,最后提取优化结果数据并建立相关Midas模型,给出他们的变化规律以及适宜取值范围,为其他桥梁在优化设计方面提供参考价值。
[Abstract]:With the development of society and the progress of science and technology, the urban trunk road interchange system has been rapidly popularized. In the process of the rapid development of urban bridge design and construction, curved steel box girder bridge has been rapidly popularized. The traditional optimal design of curved steel box girder is based on the assumption scheme (according to the previous design experience reference criterion)-structure calculation analysis-checking calculation (stiffness, stability, strength)-fine tuning design scheme. In view of the traditional design process, the preliminary design scheme is more important, which is more difficult for the designers who have just entered the design line and who are inexperienced, and different designers will come up with different structures or different design schemes. All of these can not keep up with the demand of modern society for complicated structure, high precision and low cost, which leads to the increase of the number of fine tuning of design engineering, the long design time, the low efficiency and the poor economy. Therefore, the optimization design of curved steel box girder can solve the above problems. On the basis of studying and studying the relevant specifications and literatures of curved steel box girder, this paper focuses on the following contents: 1: 1, after elaborating in detail and verifying the correctness of hybrid integral quadratic programming method, Based on the example of a three-span curved steel box girder bridge, the optimization model of curved steel box girder is established. The MIQL algorithm is used, and the mixed programming mode of FORTRAN language and VB is used. The core part of this paper is developed: the automatic optimization design system of curved steel box girder bridge. The optimization results of engineering examples are extracted, and the optimization results and process analysis are carried out, and the finite element model of optimization results is established with the help of Midas software. Finally, the relevant calculation results are checked, and the calculation results of Midas model before and after optimization are calculated and analyzed by introducing the security reserve factor (k). The above content verifies the feasibility, rationality and correctness of the automatic optimization design system. It shows that the optimization program of hybrid integral quadratic programming method can be used to study the optimization design of curved steel box girder effectively. Finally, the thickness of stiffened ribs, the distance between transverse partitions and the height of beams are calculated and analyzed, and the concept of value of performance to price value x is put forward. Finally, the data of optimization results are extracted and the relevant Midas model is established. Their variation law and suitable value range are given, which provides reference value for other bridges in optimization design.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.5

【参考文献】