【摘要】：鋼管混凝土桁肋拱常在大跨度拱橋設(shè)計(jì)中應(yīng)用,其桁肋拱是由弦桿和綴桿或者鋼板所組成,相對(duì)于鋼筋混凝土材料、單圓管和啞鈴型截面來(lái)說(shuō),其擁有較高的截面效率。桁肋拱是由橫撐將兩拱肋聯(lián)系在一起,以確保其橫向穩(wěn)定性,故研究橫撐對(duì)鋼管混凝土桁肋拱面外穩(wěn)定性的影響具有重要的理論意義和工程價(jià)值。本文介紹了鋼管混凝土結(jié)構(gòu)的概況和發(fā)展,列出了一部分國(guó)內(nèi)外研究者在鋼管混凝土桁式拱橋穩(wěn)定性方面的研究成果,從中簡(jiǎn)要介紹了關(guān)于鋼管混凝土拱肋彈性穩(wěn)定性和極限承載力的理論與方法。其中,對(duì)鋼管混凝土拱橋的彈性穩(wěn)定性分析研究所占比例較大,極限承載力的分析研究較小；利用軟件分析鋼管混凝土拱肋穩(wěn)定性的研究較多,建立實(shí)際模型拱肋并研究的較少。這使得鋼管混凝土桁肋拱的設(shè)計(jì)參數(shù)還要繼續(xù)深入探討。本文以自行設(shè)計(jì)的鋼管混凝土桁肋拱為研究對(duì)象,利用ANSYS有限元分析軟件建立該拱肋的空間有限元模型,分析了該拱肋的失穩(wěn)模態(tài)、彈性穩(wěn)定系數(shù)和進(jìn)行了考慮其材料非線性與幾何非線性的極限承載力研究。探討了橫撐的布置形式、橫撐的樣式和橫撐的剛度對(duì)鋼管混凝土桁肋拱面外穩(wěn)定性能的影響,結(jié)論如下：(1)在拱橋設(shè)計(jì)時(shí)應(yīng)盡量選擇合適的橫撐數(shù)量和橫撐間距,可以提高鋼管混凝土桁肋拱的面外穩(wěn)定性。(2)拱肋在四分點(diǎn)處的相對(duì)搓動(dòng)較大,因此應(yīng)該在四分點(diǎn)處設(shè)置強(qiáng)大的橫撐。并盡量避免橫撐最大間距落在四分點(diǎn)處,使拱肋彈性穩(wěn)定性降低。(3)在拱頂應(yīng)設(shè)置一道橫撐,這可使拱肋的橫向聯(lián)系增強(qiáng),增加彈性穩(wěn)定性。而且,拱頂橫撐選擇“一”字型橫撐足以,既可保證彈性穩(wěn)定,又可降低自重和簡(jiǎn)便橫撐施工工序。(4)橫撐的不同樣式中,“米”字型和“X”字型橫撐能使拱肋得到更高的彈性穩(wěn)定系數(shù)。端部橫撐則使用“K”字型橫撐會(huì)較容易達(dá)到橋面凈空要求,而且拱肋的彈性穩(wěn)定不會(huì)降低。(5)橫撐的剛度對(duì)拱肋的彈性穩(wěn)定性影響不太明顯,在設(shè)計(jì)中選擇適當(dāng)?shù)匿摴鼙诤窦缺ＷC不發(fā)生局部失穩(wěn)即可,又可以減輕自重。(6)通過(guò)采用千分之一的初始缺陷的極限承載力分析所得的結(jié)果顯示,橫撐對(duì)鋼管混凝土桁肋拱的極限承載力的影響與對(duì)其彈性穩(wěn)定性的影響基本相同。(7)鋼管混凝土桁肋拱的極限承載力系數(shù)要比彈性穩(wěn)定系數(shù)小,各模型所得系數(shù)均相差15%左右,即說(shuō)明在考慮鋼管混凝土桁肋拱穩(wěn)定性問(wèn)題的時(shí)候,既要進(jìn)行彈性穩(wěn)定分析,又要考慮到其極限承載力系數(shù)的問(wèn)題,二者缺一不可。
[Abstract]:Concrete filled steel tube truss rib arch is often used in the design of long-span arch bridge. Its truss rib arch is composed of chord, affix bar or steel plate. Compared with reinforced concrete material, single circular tube and dumbbell section, it has high cross-section efficiency. Truss rib arch is connected by transverse braces to ensure its lateral stability, so it is of great theoretical significance and engineering value to study the influence of transverse bracing on the out-of-plane stability of concrete-filled steel tubular truss rib arch. This paper introduces the general situation and development of concrete-filled steel tubular (CFST) structures, and lists some domestic and foreign research achievements on the stability of CFST truss arch bridges. The theory and method of elastic stability and ultimate bearing capacity of concrete-filled steel tubular arch rib are briefly introduced. Among them, the research on the elastic stability of concrete-filled steel tubular arch bridge accounts for a large proportion, the ultimate bearing capacity analysis and research is small; The stability of concrete-filled steel tubular arch rib is analyzed by software. This makes the design parameters of CFST truss rib arch to be further discussed. In this paper, the spatial finite element model of concrete filled steel tubular truss rib arch is established by using ANSYS finite element analysis software, and the instability mode of the arch rib is analyzed. The elastic stability coefficient and the ultimate bearing capacity considering the material nonlinearity and geometric nonlinearity are studied. The effects of the arrangement of transverse brace, the style of transverse brace and the stiffness of transverse brace on the stability of concrete-filled steel tubular truss rib arch are discussed. The conclusions are as follows: (1) when designing arch bridge, the appropriate number and spacing of transverse brace should be selected as far as possible. It can improve the out-of-plane stability of concrete-filled steel tube arch with truss ribs. (2) the relative rubbing of arch ribs at four points is relatively large, so strong transverse braces should be set at four points. As far as possible, the maximum spacing of transverse braces should be avoided at four points to reduce the elastic stability of arch ribs. (3) A transverse brace should be set at the top of the arch, which can strengthen the transverse connection of arch ribs and increase the elastic stability. Moreover, the choice of "one" type crossbrace is enough to ensure the stability of elasticity and reduce the weight and convenience of the construction process. (4) in the different types of crossbrace, The cross-bracing of meter and X-type can increase the elastic stability coefficient of arch rib. On the other hand, the "K" transverse brace can easily meet the bridge floor clearance requirement, and the elastic stability of arch rib will not be reduced. (5) the stiffness of transverse brace has little effect on the elastic stability of arch rib. In the design, the proper thickness of the steel pipe wall can not only ensure that there will be no local instability, but also reduce the weight of the steel pipe. (6) through the analysis of the ultimate bearing capacity of the initial defect of 1/1000, the results show that, The influence of transverse brace on ultimate bearing capacity of CFST truss rib arch is basically the same as that on its elastic stability. (7) the ultimate bearing capacity coefficient of CFST truss rib arch is smaller than that of elastic stability factor. The difference of the coefficients of each model is about 15%, that is, when considering the stability of concrete-filled steel tubular truss rib arch, it is necessary to carry out elastic stability analysis as well as to consider the ultimate bearing capacity coefficient.
【學(xué)位授予單位】：沈陽(yáng)建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.22;U442.5

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