【摘要】：隨著社會的發(fā)展和科技的進步,城市主干路立交系統(tǒng)得到快速普及,在城市橋梁設計建設的飛躍發(fā)展過程中,曲線鋼箱梁橋已被迅速推廣。傳統(tǒng)的曲線鋼箱梁優(yōu)化設計,路徑大致是：假設方案(根據(jù)以往設計經(jīng)驗參考規(guī)范初擬的方案)—結構計算分析—驗算(剛度、穩(wěn)定性、強度)—微調(diào)設計方案。針對傳統(tǒng)的設計過程,其初步擬定的設計方案比較重要,這對于剛步入設計行列、經(jīng)驗不足的設計師來說困難較大,并且不同設計者會得出不同結構或差異較大的設計方案,這些均跟不上現(xiàn)代社會對結構復雜、精度高、造價低橋梁的需求,導致設計工程微調(diào)次數(shù)增多、設計時間長、效率低、經(jīng)濟性差。因此,對曲線鋼箱梁進行優(yōu)化設計可對上述問題進行解決。本文在學習、研究曲線鋼箱梁相關規(guī)范和文獻的基礎上,重點進行以及得出的內(nèi)容如下所示：1、在詳細闡述、驗證混合整型二次規(guī)劃方法的正確性之后,結合某三跨曲線鋼箱梁橋工程實例,建立了曲線鋼箱梁優(yōu)化模型,運用MIQL算法,并利用FORTRAN語言和VB混合編程的模式,開發(fā)出本文核心部分：曲線鋼箱梁橋自動優(yōu)化設計系統(tǒng)。2、提取工程實例的優(yōu)化結果,進行優(yōu)化結果和過程分析；借助Midas軟件建立優(yōu)化結果有限元模型,最后進行相關的計算結果驗算；引入安全儲備因子k,對優(yōu)化前后Midas模型計算結果進行計算分析。上述內(nèi)容驗證了該自動優(yōu)化設計系統(tǒng)的可行性、合理性與正確性,說明采用混合整型二次規(guī)劃法優(yōu)化程序可以對曲線鋼箱梁進行有效的優(yōu)化設計研究、達到節(jié)省造價的目的。3、最后對加勁肋厚度、橫隔板間距以及梁高進行計算分析,并提出性價比值數(shù)x的概念,最后提取優(yōu)化結果數(shù)據(jù)并建立相關Midas模型,給出他們的變化規(guī)律以及適宜取值范圍,為其他橋梁在優(yōu)化設計方面提供參考價值。
[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.
【學位授予單位】：東北林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.5

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