本文選題：T構(gòu)橋 + 轉(zhuǎn)體施工�。� 參考：《武漢理工大學(xué)》2014年碩士論文

【摘要】：進(jìn)入21世紀(jì)以來(lái)，我國(guó)的橋梁建設(shè)取得了較大的進(jìn)步和發(fā)展，隨著路網(wǎng)的不斷完善和擴(kuò)展，必然需要修建大量跨越既有線路的橋梁工程，包括跨越既有鐵路、新建鐵路、既有公路橋梁及新建公路橋梁等工程。為減弱對(duì)既有線路的影響，同時(shí)保證線路交叉的安全和經(jīng)濟(jì)適用性，采用轉(zhuǎn)體施工的橋梁逐步增加，也被鐵路局等業(yè)主單位所認(rèn)同。為此，有必要深入研究和剖析采用轉(zhuǎn)體施工的橋梁工程的各類參數(shù)，以對(duì)其進(jìn)行設(shè)計(jì)和施工進(jìn)行優(yōu)化，降低工程造價(jià)，提高此類橋梁的設(shè)計(jì)和施工質(zhì)量。文章以參數(shù)敏感性分析為理論基礎(chǔ)，，對(duì)轉(zhuǎn)體施工的橋梁工程進(jìn)行參數(shù)敏感性識(shí)別和分析研究。文章從以下五個(gè)方面開(kāi)展研究： （1）分析了轉(zhuǎn)體施工橋梁工程設(shè)計(jì)、施工現(xiàn)狀和發(fā)展趨勢(shì)，闡述了該類橋梁工程設(shè)計(jì)和施工中應(yīng)考慮的影響參數(shù)，分析了該類型橋梁參數(shù)敏感性分析的現(xiàn)狀并提出本文的研究?jī)?nèi)容及意義。 （2）從理論角度研究了參數(shù)敏感性分析的基本理論和方法，并針對(duì)轉(zhuǎn)體施工的橋梁工程，對(duì)該類橋梁提出了單因素和多因素識(shí)別方法，同時(shí)研究統(tǒng)計(jì)了影響橋梁應(yīng)力和線形的關(guān)鍵參數(shù)及其識(shí)別方法。 （3）建立了轉(zhuǎn)體施工T構(gòu)橋的數(shù)值分析模型。以背景項(xiàng)目工程監(jiān)測(cè)監(jiān)控為基礎(chǔ)，采用現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)，對(duì)已建的數(shù)值分析模型進(jìn)行修正和完善，以期成為符合現(xiàn)場(chǎng)實(shí)際情況的基準(zhǔn)模型，為參數(shù)敏感性分析提供理論分析模型。 （4）進(jìn)行了轉(zhuǎn)體施工橋梁?jiǎn)我蛩貐?shù)敏感性分析。以主梁混凝土、預(yù)應(yīng)力張拉力、鋼筋銹蝕等作為材料參數(shù)進(jìn)行單因素敏感性分析；以汽車荷載、溫度作用、混凝土收縮徐變、基礎(chǔ)不均勻沉降等作為作用參數(shù)進(jìn)行逐一的單因素敏感性分析。結(jié)果表明：即彈性模量對(duì)應(yīng)力的影響較��；對(duì)主梁應(yīng)力影響較大的為主梁容重、預(yù)應(yīng)力張拉力、預(yù)應(yīng)力鋼筋銹蝕。 （5）基于單因素敏感性分析，進(jìn)行了轉(zhuǎn)體施工橋梁多因素參數(shù)敏感性分析。對(duì)主梁混凝土、預(yù)應(yīng)力等作為材料參數(shù)進(jìn)行隨機(jī)的多因素敏感性分析，并分析了其敏感性程度；以汽車荷載、溫度作用、混凝土收縮徐變、基礎(chǔ)不均勻沉降等作為作用參數(shù)進(jìn)行隨機(jī)的多因素敏感性分析，并分析了其敏感性程度。結(jié)果表明：從趨勢(shì)上講，與單因素相應(yīng)為一致，即隨著外力作用效應(yīng)的增加，主梁應(yīng)力水平降低，導(dǎo)致壓應(yīng)力儲(chǔ)備降低，甚至可能出現(xiàn)拉應(yīng)力或者超規(guī)范的限值。從實(shí)際應(yīng)力絕對(duì)值講，容重、預(yù)應(yīng)力張拉力、汽車活載、支座沉降作用等均對(duì)應(yīng)力較為敏感。 綜上，通過(guò)對(duì)轉(zhuǎn)體施工T構(gòu)橋梁工程參數(shù)敏感性分析，研究結(jié)果和結(jié)論可以為設(shè)計(jì)、施工及運(yùn)營(yíng)管理等部門提供指導(dǎo)，并進(jìn)行相應(yīng)的優(yōu)化管理。
[Abstract]:Since entering the 21st century, the bridge construction in our country has made great progress and development. With the continuous improvement and expansion of the road network, it is necessary to build a large number of bridge projects spanning the existing lines, including crossing the existing railways and building new railways. Existing highway bridges and new highway bridges and other projects. In order to weaken the influence on the existing lines and ensure the safety and economic applicability of the crossing of the lines, the number of bridges constructed by the rotary construction has been gradually increased, which has also been recognized by the owners such as the Railway Bureau. Therefore, it is necessary to deeply study and analyze the various parameters of the bridge construction with rotary construction in order to optimize the design and construction of the bridge, reduce the project cost and improve the design and construction quality of this kind of bridge. Based on the theory of parameter sensitivity analysis, this paper studies the parameter sensitivity identification and analysis of bridge engineering in rotary construction. In this paper, the following five aspects are studied: (1) the paper analyzes the design, construction status and development trend of the rotary construction bridge, and expounds the influence parameters which should be considered in the design and construction of this kind of bridge. The present situation of parameter sensitivity analysis of this type of bridge is analyzed, and the research content and significance of this paper are put forward. (2) the basic theory and method of parameter sensitivity analysis are studied from the theoretical point of view. The single factor and multi-factor identification methods are proposed for this kind of bridge. The key parameters affecting the stress and alignment of the bridge and their identification methods are also studied. (3) the numerical analysis model of the T-structure bridge in rotary construction is established. Based on the background project monitoring and monitoring, the established numerical analysis model is modified and perfected by using the field measured data in order to become the benchmark model in accordance with the actual situation in the field. It provides a theoretical analysis model for parameter sensitivity analysis. (4) the single factor parameter sensitivity analysis of rotating construction bridge is carried out. The single factor sensitivity analysis of main beam concrete, prestressed tensioning force, steel bar corrosion and so on is carried out, and the shrinkage and creep of concrete are analyzed by automobile load, temperature effect, concrete shrinkage and creep, etc. The single factor sensitivity analysis is carried out one by one as action parameters such as uneven settlement of foundation. The results show that the elastic modulus has little effect on the stress, the bulk density, the prestress tension and the corrosion of the prestressed steel bar of the main beam have greater influence on the stress of the main beam. (5) based on the single factor sensitivity analysis, The sensitivity analysis of multi-factor parameters is carried out. The random multifactor sensitivity analysis of the main beam concrete, prestress and so on as material parameters is carried out, and the sensitivity degree is analyzed, and the shrinkage and creep of concrete are analyzed by automobile load, temperature effect, concrete shrinkage and creep, etc. The random multifactor sensitivity analysis was carried out and the sensitivity degree was analyzed. The results show that the trend is consistent with that of single factor, that is, with the increase of external force effect, the stress level of the main beam decreases, which leads to the decrease of compressive stress reserve, and even the possibility of tensile stress or the limit value of superstandard. In terms of the absolute value of actual stress, bulk density, prestress tension, live load of automobile and settlement of bearing are all sensitive to the stress. In summary, through the sensitivity analysis of the engineering parameters of T structure bridge in rotary construction, the research results and conclusions can provide guidance for the departments of design, construction and operation management, and carry out the corresponding optimization management.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.4;U448.23

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