【摘要】：近年來隨著我國經(jīng)濟(jì)不斷發(fā)展、工程建設(shè)和交通運(yùn)輸也在迅猛發(fā)展,交通運(yùn)輸量在大幅度的提高,橋梁在人們?nèi)粘Ｉ钪兄匾匀找嫱癸@。但是由于潮汐等不利因素對于橋梁的影響,正在服役期的橋梁的橋墩、橋臺、蓋梁等很容易出現(xiàn)銹脹現(xiàn)象。這將會對人民的生命財(cái)產(chǎn)帶來安全隱患。本文研究了鋼筋混凝土橋墩銹脹的影響。通過不同的銹脹程度分析了橋墩的應(yīng)力、位移等變化,同時也探討了多種關(guān)于橋墩銹脹的加固方法,具有重要的理論意義和工程指導(dǎo)價值。本文通過MIDAS CIVIL有限元分析軟件,建立了橋梁的有限元模型。在對稱車道荷載對橋墩作用下,計(jì)算了不同銹脹程度對橋墩的影響。以箍筋處20mm保護(hù)層混凝土規(guī)則均勻剝落和縱筋30mm處保護(hù)層混凝土規(guī)則均勻剝落為變化參數(shù),分別比較橋墩完好時截面,銹脹開裂20mm截面,銹脹開裂30mm截面的軸壓力、墩底彎矩和應(yīng)力、位移的影響。其中還考慮了鋼筋混凝土橋墩的銹脹部位,分別以30mm厚、500mm長的整體剝落的銹脹出現(xiàn)在橋墩,且由墩底至墩頂起1m,3m,5m,7m,9m為變化參數(shù)進(jìn)行了橋墩的分析計(jì)算。分析鋼筋混凝土橋墩的銹脹出現(xiàn)在橋墩哪些部位對于橋梁結(jié)構(gòu)最不利。本文還探討了橋墩銹脹的加固方法。通過各種影響因素的比較,最終選定增大截面法對銹脹的橋墩進(jìn)行加固。通過有限元軟件對比分析了鋼筋混凝土橋墩銹脹前后的反力、彎矩、應(yīng)力、位移等,得出沿箍筋或縱筋的混凝土均勻剝落的銹脹出現(xiàn)在橋墩會對橋墩安全性造成一定影響。建議對銹脹后的鋼筋混凝土橋墩進(jìn)行加固處理；該研究對于同類橋梁的鋼筋混凝土橋墩的銹脹分析有一定的參考價值。
[Abstract]:In recent years, with the continuous development of our country's economy, engineering construction and transportation are also developing rapidly. The traffic volume is increasing by a large margin, and the importance of bridge in people's daily life is becoming more and more prominent. However, due to the influence of tide and other adverse factors on the bridge, the bridge pier, abutment, cover beam and so on are prone to rust expansion. This will bring people's lives and property a security hazard. In this paper, the effect of rust expansion on reinforced concrete pier is studied. Through the analysis of the stress and displacement of the bridge pier with different degree of rust expansion, various strengthening methods of the pier are also discussed, which has important theoretical significance and engineering guiding value. In this paper, the finite element model of bridge is established by MIDAS CIVIL finite element analysis software. Under the action of symmetrical driveway load on the pier, the influence of different rust expansion degree on the pier is calculated. Taking regular spalling of 20mm cover concrete at stirrups and uniform spalling of concrete rules at longitudinal reinforcement 30mm as variation parameters, the axial pressure of 20mm section, 20mm section of rusting cracking and 30mm section of rusting cracking are compared respectively when the pier is in good condition. The influence of bending moment, stress and displacement on pier bottom. The rust expansion of reinforced concrete pier is also taken into account. The whole exfoliation with 30mm thickness of 500mm long appears in the pier, and the pier is analyzed and calculated from the bottom of the pier to the top of the pier with the variation parameter of 1 m ~ 3 m ~ 5 m ~ (?) ~ 7 m ~ (9 m). This paper analyzes which parts of reinforced concrete pier are most unfavorable to bridge structure. This paper also discusses the strengthening method of bridge pier rust expansion. Through the comparison of various factors, the method of increasing section is chosen to reinforce the rusty pier. By means of finite element software, the reaction force, bending moment, stress and displacement of reinforced concrete pier before and after rust expansion are compared and analyzed. It is concluded that the appearance of uniform exfoliation of concrete along stirrups or longitudinal bars in the pier will have a certain impact on the safety of the pier. It is suggested that the reinforced concrete pier should be strengthened after rust expansion, and this study has some reference value for the rust expansion analysis of the reinforced concrete pier of the same kind of bridge.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441
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本文編號：2235772