【摘要】：多跨鋼筋混凝土箱型肋拱橋相對其他橋型,具有造型優(yōu)美、施工方便、造價(jià)較低和跨越能力較大等特點(diǎn),在我國應(yīng)運(yùn)十分廣泛。但是,在眾多建成的多跨鋼筋混凝土箱型肋拱橋之中,不少橋梁都出現(xiàn)了不同程度的病害,已經(jīng)不能滿足當(dāng)今社會(huì)交通的需求,因此對多跨鋼筋混凝土肋拱橋加固方法進(jìn)行研究有著重大的意義。本文在匯總了國內(nèi)外所做的橋梁加固方法研究工作之后,總結(jié)了多跨鋼筋混凝土箱型肋拱橋常見病害,同時(shí)對引起病害的原因進(jìn)行了分析,然后對該類橋型的加固技術(shù)理論和方法進(jìn)行了深入研究,同時(shí)對主要部件的加固技術(shù)特點(diǎn)也進(jìn)行了大量研究工作。本文以藤縣西江大橋加固項(xiàng)目為例,在加固前對大橋進(jìn)行了外觀檢測、荷載試驗(yàn)、病因分析和內(nèi)力檢算,然后提出對主橋拱肋靠近拱腳三小跨采用增大截面、部分拱上立柱采用增大截面、立柱上蓋梁采用黏貼鋼板的加固方法進(jìn)行加固。利用MIDAS/Civil和ANSYS有限元軟件建立了藤縣西江大橋有限元整體分析模型和局部有限元模型,對全橋進(jìn)行了內(nèi)力檢算、應(yīng)力分析以及全橋整體穩(wěn)定性分析,對蓋梁、立柱進(jìn)行了局部分析。分析結(jié)果顯示,在加固后恒載作用下,主拱肋彎矩平均增加6.9%,軸力平均增加10.2%。在正常使用各工況下,彎矩和軸力平均增加了 9.2%左右,但拱腳壓應(yīng)力減小了 15.54%,拱頂由拉應(yīng)力變?yōu)閴簯?yīng)力,無裂縫產(chǎn)生。加固后局部構(gòu)件應(yīng)力均相應(yīng)減小,其中最大拉應(yīng)力減小了 29%。加固后橋梁承載能力增加18.4%。同時(shí),橋梁整體穩(wěn)定性增強(qiáng)�？梢娂庸绦Ч容^理想,為加固維修設(shè)計(jì)后的可靠性提供了理論數(shù)據(jù)。在加固完成后,又對藤縣西江大橋進(jìn)行了外觀檢測和荷載試驗(yàn),檢測結(jié)果沒有發(fā)現(xiàn)新增病害,加固后荷載試驗(yàn)結(jié)果表明橋梁承載能力滿足設(shè)計(jì)荷載要求。且第19和20跨在相同荷載試驗(yàn)工況下,撓度分別是加固前的47.1%和68.3%,應(yīng)變分別是加固前的62.5%和77.2%。加固后剛度、穩(wěn)定性增強(qiáng)顯著,驗(yàn)證了本次加固方案的有效性和可靠性。本文的研究結(jié)果能為多跨鋼筋混凝土雙肋箱型拱橋的加固設(shè)計(jì)提供一定的參考。
[Abstract]:Compared with other bridges, multi-span reinforced concrete box-ribbed arch bridges have the characteristics of beautiful shape, convenient construction, low cost and large span capacity, which should be widely used in our country. However, among the many multi-span reinforced concrete box rib arch bridges, many bridges have been damaged to varying degrees, which can not meet the needs of social transportation. Therefore, it is of great significance to study the reinforcement method of multi-span reinforced concrete rib arch bridge. After summarizing the research work of bridge reinforcement method at home and abroad, this paper summarizes the common diseases of multi-span reinforced concrete box rib arch bridge, and analyzes the causes of the disease. Then, the theory and method of this kind of bridge reinforcement technology are deeply studied, and a lot of research work is also done on the technical characteristics of the main components. Taking Xijiang Bridge reinforcement project in Fuxian County as an example, the paper carries out the exterior inspection, load test, etiology analysis and internal force check of the bridge before reinforcement, and then proposes to adopt an enlarged section for the arch rib near the arch foot of the main bridge. Part of the arch column is reinforced by increasing section, and the upper cover beam of the column is strengthened by sticking steel plate. The whole finite element analysis model and local finite element model of Xijiang Bridge in Fuxian County are established by using MIDAS/Civil and ANSYS finite element software. The internal force check, stress analysis and overall stability analysis of the whole bridge are carried out. The local analysis of the column is carried out. The results show that the bending moment of the main arch rib increases by 6.9 and the axial force increases by 10.2. Under the normal operation conditions, the bending moment and axial force increase by about 9.2% on average, but the compressive stress of arch foot decreases by 15.54, and the arch top changes from tensile stress to compressive stress, and no cracks occur. After strengthening, the local stress decreases correspondingly, and the maximum tensile stress decreases by 29%. After strengthening, the bearing capacity of the bridge was increased by 18.4. At the same time, the overall stability of the bridge is enhanced. It can be seen that the effect of reinforcement is ideal, which provides theoretical data for the reliability of design of reinforcement and maintenance. After the reinforcement, the external appearance test and load test of Xijiang Bridge in Fuxian County were carried out, and no new diseases were found. The results of the strengthened load test showed that the bearing capacity of the bridge met the design load requirements. The deflection of the 19th and 20th span under the same load test conditions is 47.1% and 68.3% of that before reinforcement, and the strain is 62.5% and 77.2% of that before reinforcement, respectively. The stiffness and stability of the reinforcement are significantly enhanced, which verifies the effectiveness and reliability of the reinforcement scheme. The results of this paper can provide a certain reference for the reinforcement design of multi-span reinforced concrete double-rib box arch bridge.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U445.72

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本文編號：2235939