本文選題：鋼管砼拱橋　切入點(diǎn)：尼爾森體系　出處：《蘭州交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：普通的鋼管砼拱橋在國內(nèi)外已有較長的發(fā)展歷史,且應(yīng)用廣范,在橋梁建設(shè)中發(fā)揮了不可替代的重要作用,近年來,我國引進(jìn)了尼爾森體系系桿拱橋,該種拱橋的主要特征為用斜向的吊索代替了傳統(tǒng)的豎向吊索,這必將帶動拱橋新的發(fā)展,但隨著當(dāng)下橋梁跨度的增大,橋面變的更寬,拱橋穩(wěn)定性的問題和系梁橫向力學(xué)特性的問題日益凸顯,關(guān)于尼爾森體系系桿拱橋拱肋穩(wěn)定性的相關(guān)研究還非常少,關(guān)于尼爾森體系系桿拱橋系梁的橫向力學(xué)特性分析更是存在較多的不確定性。本文針對尼爾森體系系桿拱橋的穩(wěn)定性和系梁橫向力學(xué)特性深入研究,得出相關(guān)結(jié)論可為工程建設(shè)提供有力的參考。本文首先參考了大量國內(nèi)外橋梁方面文獻(xiàn),介紹了國內(nèi)外在尼爾森體系的系桿拱橋方面的發(fā)展歷史及研究現(xiàn)狀,以及本文的選題意義和主要研究工作。國內(nèi)外目前尚未見到其統(tǒng)一的規(guī)范和規(guī)程(關(guān)于鋼管混凝土拱橋的設(shè)計(jì)與施工),這就導(dǎo)致目前國內(nèi)外的設(shè)計(jì)與施工中存在較大自由行,難以嚴(yán)格把控其合理性,而本文研究的尼爾森體系系桿拱橋作為一種新型的系桿拱結(jié)構(gòu)形式,更是沒有統(tǒng)一的設(shè)計(jì)施工標(biāo)準(zhǔn),在這種情況下,盲目的憑借以往的拱橋經(jīng)驗(yàn)進(jìn)行設(shè)計(jì)和施工,不合理的設(shè)計(jì)和盲目的施工可能導(dǎo)致工程的病害甚至坍塌等事故。因此目前對尼爾森體系系桿拱橋的鋼管混凝土拱橋的靜、動力性能進(jìn)行研究急需開展,以便為其合理的設(shè)計(jì)和施工提供可靠的理論基礎(chǔ)。作為全球的基建大國,我國已經(jīng)有非常多的普通鋼管混凝土拱橋的相關(guān)經(jīng)驗(yàn),為系桿拱橋在我國的快速發(fā)展奠定了重要基礎(chǔ),但尼爾森體系系桿拱橋的相關(guān)經(jīng)驗(yàn)還少之又少,國外已經(jīng)對其有了豐富的應(yīng)用和發(fā)展,且研究比較成熟,相比之下,國內(nèi)學(xué)者即使對普通鋼管混凝土拱橋的研究也正方興未艾,而對鋼管混凝土拱的尼爾森體系系桿拱橋的研究還鮮有開展。其次,研究穩(wěn)定性相關(guān)的理論。在拱橋設(shè)計(jì)中,失穩(wěn)問題不容忽視,研究拱的失穩(wěn)有重要意義。從失穩(wěn)的理論層面對穩(wěn)定性問題進(jìn)行了詳細(xì)的研究,主要包括了第一類穩(wěn)定的問題的有限元分析和其非線性狀態(tài)的近似求解方法,以及第一類失穩(wěn)中的面內(nèi)失穩(wěn)和面外失穩(wěn)的研究理論和有限元求解方法。在理論分析的基礎(chǔ)上,結(jié)合本文的實(shí)際工程,研究了尼爾森體系系桿拱橋的拱肋的穩(wěn)定性及其影響因素,利用有限元軟件MIDAS建立了桿系結(jié)構(gòu)有限元模型,對比分析4種荷載工況、5種橫撐形式、變化的橫撐剛度及變化的預(yù)應(yīng)力對拱肋穩(wěn)定性的影響,并得出結(jié)論:在研究荷載對拱肋穩(wěn)定性影響中可以看到橫向風(fēng)荷載對拱肋穩(wěn)定性影響較小,而系梁上增加豎向荷載,拱肋的穩(wěn)定性有顯著的降低,因此可以看出在吊索傳遞更多的荷載給拱肋時(shí),其穩(wěn)定性隨之降低;拱肋間橫撐形式對拱肋穩(wěn)定性有明顯的影響,對比分析可以看到中間米撐兩側(cè)各兩組K撐的橫撐形式是即經(jīng)濟(jì)又有效的橫撐形式;橫撐剛度提高也使得拱肋結(jié)構(gòu)整體穩(wěn)定性隨之提高,但隨著橫撐剛度進(jìn)一步提高對拱肋整體穩(wěn)定的提高有限,且兩邊橫撐剛度的變化對結(jié)構(gòu)穩(wěn)定系數(shù)有較大影響,基于有限元分析結(jié)果,建議中間橫撐的剛度減低為原設(shè)計(jì)的0.6倍,邊橫撐維持不變,這樣整體穩(wěn)定性僅降低了1.16%,可以在幾乎不降低結(jié)構(gòu)穩(wěn)定性的基礎(chǔ)上變的更經(jīng)濟(jì);預(yù)應(yīng)力的施加和增大均使拱肋穩(wěn)定系數(shù)提高,從增加量上分析,預(yù)應(yīng)力荷載施加基數(shù)從0.2增加至1.8,穩(wěn)定系數(shù)從12.10增加到12.54,增加了3.64%,可見預(yù)應(yīng)力對拱肋穩(wěn)定性影響較小。再次,對于箱形梁橋的橫向內(nèi)力分析方法進(jìn)行了探討,探討了包括國內(nèi)外學(xué)者對于箱梁橫向分析的主要方法如平面框架法、板單元影響面法等�；谇笆龌纠碚�,結(jié)合本文實(shí)際工程:鄭萬128m尼爾森體系系桿拱橋,石梁河特大橋,對于該橋的箱室截面及其橫梁進(jìn)行了精細(xì)化多方案有限元分析,分別建立全橋有限元模型、平面桿系系梁截面、橫梁截面、有橫梁的板單元系梁模型、無橫梁的板單元模型及利用ANSYS建立簡化的節(jié)段實(shí)體有限元模型,通過與全橋?qū)嶓w模型對比分析尼爾森體系系桿拱橋的系梁橫向力學(xué)特性。分析得出了箱室的平面框架法僅可適用于無橫隔板或橫隔板縱向距離很大的箱梁、對于有橫隔板的箱梁利用板單元計(jì)算更為準(zhǔn)確且操作方便等主要結(jié)論。認(rèn)為在邊腹板、邊室跨中、中腹板及中室跨中具有一個(gè)應(yīng)力的峰值點(diǎn),設(shè)計(jì)值應(yīng)作為最不利點(diǎn),在計(jì)算中平面框架法對有橫梁的拱橋系梁并不適用,在箱室處計(jì)算值偏大,在橫梁處計(jì)算值偏小,這是由于系梁縱向荷載分布不均勻?qū)е碌?橫梁處剛度較大則承受了更大的荷載,而箱室處剛度較小則承受了較小的荷載。最后,對本文全部內(nèi)容給出結(jié)論,本文閱讀了大量相關(guān)文獻(xiàn),對涉及尼爾森體系系桿拱橋穩(wěn)定性相關(guān)理論和系梁橫向分析方法進(jìn)行了總結(jié),本文依據(jù)實(shí)際工程石梁河特大橋,針對尼爾森體系系桿拱橋的穩(wěn)定性和系梁橫向力學(xué)特性進(jìn)行了初步探討,得出了有益的結(jié)論。下承式尼爾森體系系桿拱橋結(jié)構(gòu)形式新穎,成橋后造型美觀,觀賞性強(qiáng)。受力方面,能承受較大的超載和偏載;鋼管砼拱橋在國內(nèi)外已有較長的發(fā)展歷史,且應(yīng)用廣范,奠定了堅(jiān)實(shí)的理論和施工基礎(chǔ),尼爾森體系系桿拱橋的引進(jìn)必將帶動拱橋的新的發(fā)展。隨著國內(nèi)外諸多學(xué)者對斜向吊索的系桿拱橋的研究不斷深入和不斷的積累建設(shè)經(jīng)驗(yàn),尼爾森體系橋梁將作為重要的結(jié)構(gòu)形式應(yīng)用在橋梁建設(shè)中。
[Abstract]:The history of the development of ordinary concrete filled steel tubular arch bridge at home and abroad have been long, and wide range of applications, in the bridge construction has played an important role, which can not be replaced in recent years, China has introduced a system of Nelson tied arch bridge, the main feature of this kind of arch bridge with inclined hangers instead of the traditional vertical sling, the arch bridge will drive the new development, but with the increase of the span of the bridge deck, wider, transverse mechanical problems and beam characteristics of the arch bridge stability problems have become increasingly prominent, there is very little research on the stability of the Nelson system of arch rib tied arch bridge, the transverse mechanical characteristics analysis of Nelson system tied beams there is more uncertainty. This paper studies the stability and mechanical properties of deep beams for Nelson tied arch bridge system, draw relevant conclusions and provide for the construction of the project Reference. Firstly, according to the domestic and international bridge literature, introduces the Nelson system at home and abroad in terms of Arch Bridge Development and the research situation and the significance of this topic and the main research work at home and abroad. It has not been seen the unified norms and regulations (the design and construction of CFST arch bridge), the led to the current design and construction at home and abroad are quite free, it is difficult to strictly control its rationality, and Nelson tied arch bridge system research as a new form of tied arch structure, it is not the design and construction of a unified standard, in this case, the blind with previous design and experience of arch bridge the construction project may lead to disease or even collapse accidents such as unreasonable design and construction of the blind. So Nelson Guan Hunning steel tied arch bridge system Soil arch bridge static, dynamic performance research is urgently needed, so as to provide a reliable theoretical basis for the reasonable design and construction. As a global power infrastructure, there has been a lot of ordinary concrete filled steel tube arch bridge experience in China, for the tied arch bridge has laid an important foundation in China's rapid development, but the relevant experience Nelson tied arch bridge system is less and less, foreign countries have on the application and development of the rich, and the research is relatively mature, by contrast, domestic scholars even on ordinary concrete filled steel tube arch bridge is the ascendant, and the study of Nelson system of tied arch bridge of CFST arch bridge is rarely carried out. Second study on the theory, related to the stability of arch bridge. In the design, the instability problem can not be ignored, the research of arch instability has important significance. From the theoretical level of instability of face stability problems in detail The study mainly includes the approximate solution of the finite element method first stability problem analysis and the nonlinear state, and the first instability and instability in the in-plane buckling theory and finite element method. On the basis of theoretical analysis, this paper combined with practical engineering, research the arch rib stability factors and influence of Nelson system of tied arch bridge, a member structure finite element model using the finite element software MIDAS, comparative analysis of 4 kinds of load conditions, 5 kinds of cross brace form, the influence of the change of the brace stiffness and change of prestressed arch rib stability, and draw the conclusion: in the study of load the arch rib stability influence can be seen in the lateral wind load of arch rib has little effect and stability, beam on vertical load increasing, the stability of arch rib is significantly reduced, it can be seen that the load transfer more in a sling To the arch rib, the stability decreases; the transverse brace between the arch form has obvious influence on the stability of the arch rib, a comparative analysis can be seen on both sides of the two meter intermediate support group K brace brace form is an economical and effective cross brace form; cross brace stiffness increase also makes the whole stability of arch structure but with the increase of transverse brace stiffness of arch rib and further improve the overall stability and improve, on both sides of brace stiffness changes have great influence on the structure stability coefficient, finite element analysis results based on the proposed intermediate cross brace stiffness is reduced to 0.6 times of the original design, the side brace remains unchanged, so the overall stability decreased only 1.16%, can be almost does not reduce the structural stability become more economical; and the increase of the applied prestressed arch rib stability coefficient increased, from the analysis of quantity increase, prestressed load base increased from 0.2 to 1.8, The stability coefficient increased from 12.10 to 12.54, an increase of 3.64%, visible on arch rib stability of prestressed is less affected. Again, the transverse internal force of box girder bridge analysis methods are discussed, including domestic and foreign scholars discussed the transverse analysis of box girder main methods such as plane frame method, plate element method. The influence of surface based on the basic theory, combined with the actual project: Zheng Wan 128M Nelson system tied arch bridge, stone river bridge, the bridge section of the chamber and the beam of the fine finite element analysis program, established the whole bridge finite element model of plane frame beam cross section, the cross section of the beam, a beam plate element system the beam model, beam and plate element model established by ANSYS simplified segment finite element model, the beam transverse mechanical properties compared with the solid model of the whole bridge analysis system of arch bridge, Nelson . analysis of the plane frame method can only be applied to the chamber without diaphragm or diaphragm vertical distance large box girder for diaphragm box girder using plate element calculation is more accurate and convenient operation. The main conclusion that at the edge of web side across the room, in the room across the web and with a stress peak point, design value should be as the most unfavorable point in the calculation method of plane frame tied arch bridge beams the beam does not apply, the calculated value is larger in the box office, the calculation value is small in the beam, this is because of the beam longitudinal load due to the uneven distribution. The beam stiffness is larger under higher loads, while the smaller chamber stiffness is under small load. Finally, contents of this paper are concluded in this paper, reading a lot of literatures, the transverse stability analysis system relates to the related theory and Nelson tied arch bridge beam Methods are summarized, according to actual engineering Shiliang River Bridge, the transverse mechanical stability and beam characteristics of Nelson tied arch bridge system were discussed, some useful conclusions are obtained. Through Nelson system tied arch bridge structure is novel, beautiful shape, highly ornamental. The force, can under high overload and unbalanced load; the development history of steel pipe concrete arch bridge at home and abroad have been long, and wide application range, and lays a theoretical foundation of the system construction, Nelson tied arch bridge arch bridge will be driven by the introduction of new development. With many scholars at home and abroad in the study of oblique arch bridge sling deepening with the continuous accumulation of experience in the construction of the bridge, Nelson will serve as an important form of system structure used in the bridge construction.

【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441

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