本文選題：預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋　切入點(diǎn)：lingo　出處：《昆明理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋在結(jié)構(gòu)體系上屬于連續(xù)梁橋。預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋既保持了連續(xù)梁橋無伸縮縫、行車平順的特點(diǎn),又有T型剛構(gòu)橋不設(shè)支座、施工方便的長處,且有很大的順橋向抗彎剛度和橫橋向抗扭剛度,它利用高墩的柔度來適應(yīng)結(jié)構(gòu)由預(yù)應(yīng)力混凝土收縮、徐變和溫度變化所引起的變形,能滿足特大跨徑橋梁的跨越及受力要求,同時(shí)在一定條件下具有用料省、施工簡便、養(yǎng)護(hù)費(fèi)用低等優(yōu)點(diǎn)。我國公路系統(tǒng)從20世紀(jì)80年代中期開始設(shè)計(jì)、建造連續(xù)梁橋,但在長期的設(shè)計(jì)實(shí)踐中,由于結(jié)構(gòu)分析的復(fù)雜冗長,雖然設(shè)計(jì)者主觀上希望把結(jié)構(gòu)設(shè)計(jì)的盡可能優(yōu),力圖使結(jié)構(gòu)輕巧、纖細(xì)、美觀以達(dá)到經(jīng)濟(jì)適用的要求,但缺乏系統(tǒng)的理論指導(dǎo)橋梁結(jié)構(gòu)設(shè)計(jì)和優(yōu)化結(jié)構(gòu)設(shè)計(jì),結(jié)構(gòu)的優(yōu)化依靠人們積累起來的經(jīng)驗(yàn),帶有很強(qiáng)的主觀性和盲目性,且工作量大,費(fèi)時(shí)費(fèi)力,又無法保證方案的正確性。所以在大跨徑PC連續(xù)剛構(gòu)橋設(shè)計(jì)中,對(duì)主要參數(shù)進(jìn)行優(yōu)化研究是必要的。本文以麗香高速某預(yù)應(yīng)力連續(xù)剛構(gòu)橋?yàn)楸尘?以lingo優(yōu)化軟件為工具,對(duì)主梁設(shè)計(jì)參數(shù)的優(yōu)化展開研究,主要完成以下工作： (1)介紹了國內(nèi)外連續(xù)剛構(gòu)橋的發(fā)展和研究現(xiàn)狀,確定了優(yōu)化變量與優(yōu)化常量。連續(xù)剛構(gòu)橋上部結(jié)構(gòu)設(shè)計(jì)參數(shù)中,邊中跨比,根部梁高的高跨比,跨中梁高的高跨比,梁底曲線冪次,施工階段劃分方式,主梁縱向鋼束布置可作為優(yōu)化變量,其余設(shè)計(jì)參量可作為優(yōu)化常量。 (2)介紹了優(yōu)化軟件lingo的數(shù)學(xué)原理及使用方法。 (3)基于lingo軟件,以主梁各離散單元的彎曲能量之和最小為目標(biāo)函數(shù),以滿足施工階段和使用階段的截面應(yīng)力要求為約束條件,優(yōu)化得到各階段所需張拉的預(yù)應(yīng)力鋼束。得出優(yōu)化后截面應(yīng)力更均勻,減少主梁用鋼量等結(jié)論。
[Abstract]:The prestressed concrete continuous rigid frame bridge belongs to the continuous beam bridge in the structure system. The prestressed concrete continuous rigid frame bridge not only maintains the characteristics of continuous beam bridge without expansion joints and smooth running, but also has the advantage of the T-type rigid frame bridge without supporting and easy construction. And there are great flexural stiffness and torsional stiffness in the transverse direction, which can adapt to the deformation caused by the shrinkage, creep and temperature change of the prestressed concrete by using the flexibility of the high pier, and can meet the requirements of the span and force of the long-span bridge. At the same time, it has the advantages of saving material, simple construction and low maintenance cost under certain conditions. Since the middle of 1980s, continuous beam bridges have been designed and built in our country's highway system, but in the long term design practice, Because of the complexity of structural analysis, although the designer subjectively wants to make the structural design as best as possible, trying to make the structure light, slender, beautiful to meet the requirements of economic application. However, there is a lack of systematic theory to guide the bridge structure design and optimization structure design. The optimization of the bridge structure depends on the experience accumulated by people. It has strong subjectivity and blindness, and the workload is large and time-consuming and laborious. Therefore, it is necessary to optimize the main parameters in the design of PC continuous rigid frame bridge with long span. In this paper, a prestressed continuous rigid frame bridge with Lixiang high-speed is used as the background, and lingo optimization software is used as the tool. The optimization of the design parameters of the main beam is studied. The main work is as follows:. This paper introduces the development and research status of continuous rigid frame bridge at home and abroad, and determines the optimization variable and optimization constant. In the design parameters of superstructure of continuous rigid frame bridge, the ratio of side to middle span, the ratio of height to span of root beam, the ratio of height to span of span center beam, the ratio of height to span of the upper structure of continuous rigid frame bridge are determined. The power of the curve at the bottom of the beam, the division of the construction stage, the arrangement of the longitudinal steel beam of the main beam can be taken as the optimization variable, and the other design parameters can be taken as the optimization constant. The mathematical principle and application method of optimization software lingo are introduced. Based on lingo software, the minimum of bending energy of the discrete elements of the main beam is taken as the objective function, and the constraint condition is to meet the requirements of the section stress in the construction stage and the use stage. The prestressing steel strands which need to be tensioned in each stage are obtained by optimization. The conclusion is drawn that the section stress is more uniform after optimization and the amount of steel used in the main beam is reduced.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.23

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