本文選題：彎梁橋 + 梁體偏移　； 參考：《合肥工業(yè)大學(xué)》2015年碩士論文

【摘要】：隨著我國公路和城市道路的迅速發(fā)展,高架道路及立體交叉工程愈來愈多,彎梁橋的運用越來越廣泛。與直線梁橋相比,彎梁橋的彎扭耦合效應(yīng)顯著,對結(jié)構(gòu)的受力不利而容易引起病害,而小半徑獨柱墩彎梁橋則甚為嚴(yán)重。針對近些年城市立交小半徑獨柱墩彎梁橋大量出現(xiàn)了橫向偏移和支座破壞等病害,本文依托合肥市五里墩立交匝道橋,對城市立交小半徑獨柱墩彎梁橋梁體的側(cè)向偏移問題進(jìn)行了比較系統(tǒng)的研究,并提出來相應(yīng)的合理的預(yù)防加固措施,論文研究具有重要的理論意義和工程實用價值。論文參考相關(guān)文獻(xiàn)資料,論述了彎梁橋的發(fā)展?fàn)顩r、國內(nèi)外研究概況及其計算理論等。結(jié)合該類橋梁出現(xiàn)的側(cè)向偏移問題,本文重點研究分析了其成因,主要分兩個方面：內(nèi)在因素(如曲率半徑、支撐方式、寬跨比、伸縮縫等)和外在因素(如車輛偏載、離心力作用、預(yù)應(yīng)力作用、溫度荷載等)。以合肥市五里墩立交橋某匝道消缺加固工程為背景,分別建立了基于梁單元和實體單元的全橋空間有限元模型,分析了不同的內(nèi)在因素在相同的溫度荷載作用(整體溫升)下和不同的外在因素(主要是外部荷載)作用下,兩種狀況下彎橋梁體的偏移情況。結(jié)合城市立交小半徑獨柱墩彎梁橋和合肥市五里墩立交獨柱匝道彎橋病害的實際情況,本文重點研究分析了溫度效應(yīng)對城市立交小半徑獨柱墩彎梁橋梁體偏移的影響,主要考慮季節(jié)溫度和日照溫度(包括豎向梯度溫度和南北向溫差)對梁體偏移的影響,最后結(jié)合加固后的A1匝道橫向偏移監(jiān)測數(shù)據(jù),對不同溫度荷載作用下的偏移進(jìn)行分析,驗證了溫度對橋梁橫向偏移影響的結(jié)論。通過對比分析得到,內(nèi)外在因素綜合影響著彎梁橋梁體的受力狀態(tài)和偏移情況。我們可以從設(shè)計和施工上改善內(nèi)外在影響因素對其橫向位移的影響,同時在運營階段加強對其管理和維修養(yǎng)護,從而保證該類橋梁長期安全穩(wěn)定運營。
[Abstract]:With the rapid development of highway and urban road in our country, more and more viaduct and intersecting engineering are used, and the application of curved girder bridge is more and more extensive.Compared with the straight beam bridge, the bending and torsional coupling effect of the curved beam bridge is obvious, which is unfavorable to the structure and easily causes the disease, while the small radius single column pier curved beam bridge is very serious.In view of the large number of diseases such as lateral migration and support failure in the small radius single-column curved girder bridge of urban interchange in recent years, this paper relies on the ramp bridge of Wulidun interchange in Hefei.This paper makes a systematic study on the lateral displacement of the curved beam bridge with small radius and single column pier of urban interchange, and puts forward the corresponding reasonable preventive and reinforcement measures. The research in this paper has important theoretical significance and practical value in engineering.With reference to relevant documents, the paper discusses the development of curved girder bridge, research situation and calculation theory at home and abroad.Combined with the lateral displacement problem of this kind of bridge, this paper focuses on the causes of its formation, which are mainly divided into two aspects: internal factors (such as radius of curvature, support mode, ratio of width to span, expansion joint, etc.) and external factors (such as vehicle partial load).Centrifugal force, prestress, temperature load, etc.On the background of a ramp eliminating and strengthening project of Wulidun overpass in Hefei City, the spatial finite element models of the whole bridge based on beam element and solid element are established, respectively.Under the same temperature load (global temperature rise) and different external factors (mainly external load), the deflection of curved bridge body is analyzed under different internal factors under the same temperature load (whole temperature rise) and different external factors (mainly external load).Combined with the actual condition of the disease of the small radius single column pier curved beam bridge of urban interchange and the single column ramp bend bridge of Wuli pier interchange in Hefei, this paper focuses on the analysis of the effect of temperature effect on the deflection of the small radius single column pier curved beam bridge in the city interchange.The influence of seasonal temperature and sunshine temperature (including vertical gradient temperature and South-North temperature difference) on beam migration is considered. Finally, the migration under different temperature loads is analyzed by combining with the strengthened A1 ramp lateral migration monitoring data.The effect of temperature on the lateral displacement of the bridge is verified.Through comparison and analysis, it is concluded that internal and external factors affect the force state and deviation of curved beam bridge.We can improve the influence of internal and external factors on the lateral displacement in design and construction, at the same time, we can strengthen the management and maintenance of the bridge in the operation stage, so as to ensure the long-term safe and stable operation of this kind of bridge.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446;U445.7

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