本文選題：鋼槽梁結(jié)合梁　切入點(diǎn)：滑移效應(yīng)　出處：《武漢理工大學(xué)》2014年碩士論文

【摘要】：預(yù)應(yīng)力混凝土-鋼槽梁結(jié)合梁是在混凝土梁和鋼梁的基礎(chǔ)上，經(jīng)過結(jié)構(gòu)的不斷優(yōu)化下提出并在實(shí)際工程中初次得以應(yīng)用的一種新的組合結(jié)構(gòu)形式，該形式解決了鋼筋混凝土箱梁自重過大，相對(duì)預(yù)應(yīng)力鋼箱梁體系，其簡(jiǎn)化了鋼材的焊接，節(jié)省了造價(jià)；尤其是鋼槽梁可與橋面形成結(jié)合梁，解決了鋼箱梁橋面易破損的難題。國(guó)內(nèi)外部分橋梁中已經(jīng)得到應(yīng)用。該橋梁形式符合大跨徑橋梁的發(fā)展方向，適應(yīng)國(guó)際先進(jìn)技術(shù)發(fā)展趨勢(shì)，極具應(yīng)用前景。因此，有必要對(duì)預(yù)應(yīng)力混凝土-鋼槽梁結(jié)合梁進(jìn)行研究。 本文結(jié)合實(shí)際工程項(xiàng)目：G318國(guó)道長(zhǎng)橋大橋以及二七長(zhǎng)江大橋漢口側(cè)引橋6×90m鋼槽梁結(jié)合梁橋，，對(duì)預(yù)應(yīng)力混凝土-鋼槽梁結(jié)合梁橋的構(gòu)造展開研究，主要研究了以下幾個(gè)方面： 首先，橫向分析：預(yù)應(yīng)力混凝土鋼槽梁結(jié)合梁橋的構(gòu)造既是混合梁橋又是結(jié)合梁橋，為了進(jìn)一步研究這種新型橋梁的構(gòu)造，分別對(duì)混合梁和結(jié)合梁兩種結(jié)構(gòu)進(jìn)行研究�？v向分析：通過系統(tǒng)的對(duì)比了三種體系結(jié)構(gòu)：鋼箱梁體系、鋼筋混凝土箱梁體系、預(yù)應(yīng)力混凝土-鋼槽梁結(jié)合梁橋，得出預(yù)應(yīng)力混凝土鋼槽梁結(jié)合梁體系的優(yōu)勢(shì)之所在。此外，系統(tǒng)的介紹了鋼-混凝土組合梁橋設(shè)計(jì)和計(jì)算，分別從鋼梁、鋼筋混凝土橋面板和剪力鍵三部分進(jìn)行。 其次，結(jié)合318國(guó)道長(zhǎng)橋工程實(shí)例，利用有限元軟件MIDAS對(duì)預(yù)應(yīng)力鋼混組合連續(xù)箱梁建立模型，參照二七長(zhǎng)江大橋漢口側(cè)引橋的鋼槽梁結(jié)合梁截面形式對(duì)預(yù)應(yīng)力混凝土鋼槽梁橋橋進(jìn)行設(shè)計(jì)，建立出對(duì)比的鋼槽梁結(jié)合梁有限元模型。通過對(duì)計(jì)算數(shù)據(jù)加以分析，得出預(yù)應(yīng)力混凝土鋼槽梁結(jié)合梁橋受力特點(diǎn)及其優(yōu)良性能。 最后，通過分別建立考慮滑移和不考慮滑移效應(yīng)的midas鋼槽梁結(jié)合梁模型，通過對(duì)比模型計(jì)算結(jié)果。研究了滑移效應(yīng)對(duì)預(yù)應(yīng)力混凝土鋼槽梁結(jié)合梁橋力學(xué)行為的影響。結(jié)果表明，滑移值隨著彎矩值大小變化而變化；考慮滑移效應(yīng)的結(jié)構(gòu)撓度增大，尤其是跨中區(qū)域；滑移效應(yīng)使得鋼槽梁上緣壓應(yīng)力以及下緣拉應(yīng)力變大。因此在在設(shè)計(jì)的過程需要保障鋼槽梁和混凝土橋面板之間的粘結(jié)強(qiáng)度。
[Abstract]:The composite beam of prestressed concrete and steel slot beam is a new type of composite structure, which is put forward by the continuous optimization of the structure on the basis of concrete beam and steel beam and is applied in practical engineering for the first time.This form solves the problem that the reinforced concrete box girder has too much self-weight and relative prestressing steel box girder system, which simplifies the welding of steel and saves the cost, especially the steel slot beam can form a combined beam with the bridge deck, and solves the difficult problem that the steel box girder bridge deck is easy to be damaged.Some bridges at home and abroad have been applied.The bridge form accords with the development direction of the long span bridge, adapts to the international advanced technology development trend, and has the extremely application prospect.Therefore, it is necessary to study the prestressed concrete-steel slot beam.First of all, transverse analysis: the structure of prestressed concrete steel groove beam combined beam bridge is not only a hybrid beam bridge but also a combined beam bridge. In order to further study the structure of this new bridge, the hybrid beam and the composite beam structure are studied separately.Longitudinal analysis: through systematic comparison of three kinds of system structures: steel box girder system, reinforced concrete box girder system, prestressed concrete-steel slot beam combined beam bridge, the advantages of prestressed concrete steel groove beam composite beam system are obtained.In addition, the design and calculation of steel-concrete composite beam bridge are introduced systematically, including steel beam, reinforced concrete deck slab and shear key.Secondly, the model of prestressed steel-concrete composite continuous box girder is established by using finite element software MIDAS with the example of 318 national highway long bridge project.According to the section form of steel groove beam combined beam of Hankou side approach bridge of Erqi Yangtze River Bridge, the prestressed concrete steel groove beam bridge is designed, and the comparative finite element model of steel slot beam composite beam is established.Based on the analysis of the calculated data, the stress characteristics and excellent performance of prestressed concrete steel slot beam combined beam bridge are obtained.Finally, the combined beam model of midas steel slot beam with and without slip effect is established, and the results are compared.The influence of slip effect on the mechanical behavior of prestressed concrete steel groove girder bridge is studied.The results show that the slip value varies with the bending moment value, the deflection of the structure with the slip effect increases, especially in the mid-span region, and the slip effect increases the compressive stress at the upper edge and the tensile stress at the lower edge of the steel slot beam.Therefore, the bond strength between steel slot beam and concrete deck slab should be guaranteed in the design process.
【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)】：U442.5

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