【摘要】：在我國經(jīng)濟(jì)快速持續(xù)發(fā)展的帶動下,交通運輸業(yè)尤其是公路橋梁越來越成為國民經(jīng)濟(jì)的一個重要環(huán)節(jié),車輛密度越來越大,重型車輛增多,我國使用公路橋梁中有相當(dāng)一部分由于達(dá)到設(shè)計使用年限、施工質(zhì)量差、維護(hù)不到位、嚴(yán)重的超載等多方面的原因,橋梁的安全狀況不容樂觀。 文章介紹了常用的混凝土橋梁結(jié)構(gòu)加固方法,如增大截面加固法,粘貼鋼板加固法,碳纖維加固法等,對常見的橋梁加固補強方法進(jìn)行系統(tǒng)的歸納總結(jié)和分析,還介紹了在選取方案選取要遵循的一般原則,以及常見的橋梁破壞方式等,后面介紹了碳纖維加固技術(shù)的研究現(xiàn)狀和發(fā)展歷程等。 本文選取橋墩為主要研究對象,并通過OpenSEES有限元軟件比較了不同碳纖維加固方式的加固效果,分析方法包括以下幾種,希望本文的一些觀點能為橋梁加固設(shè)計提供合理的建議。 (1)動力時程分析的結(jié)果能較為真實的反映結(jié)構(gòu)的地震反應(yīng),通過比較在地震作用下橋墩墩頂位移來分析加固效果。 (2) pushover方法是用于評估結(jié)構(gòu)抗震性能的一種靜力彈塑性方法,避免了非線性動力分析的繁瑣,又具有較好的準(zhǔn)確性。本文通過對施加墩頂集中力的pushover方法來比較結(jié)構(gòu)的性能。 (3)滯回曲線反映了結(jié)構(gòu)在反復(fù)受力過程中的變形特征和剛度退化等,通過滯回環(huán)圍成的面積大小來反應(yīng)結(jié)構(gòu)的塑性變形能力。
[Abstract]:Driven by the rapid and sustained economic development of our country, transportation, especially highway and bridge, has become an important link in the national economy. The density of vehicles is increasing, and the number of heavy vehicles is increasing. Due to many reasons, such as reaching the design service life, poor construction quality, poor maintenance, serious overload and so on, the safety condition of the bridges in our country is not optimistic. This paper introduces the common reinforcement methods of concrete bridge structure, such as the reinforcement method of increasing section, the strengthening method of sticking steel plate, the strengthening method of carbon fiber, and so on. The common methods of strengthening and strengthening bridges are summarized and analyzed systematically. It also introduces the general principles to be followed in the selection of the selection scheme and the common bridge failure modes. The research status and development process of the carbon fiber reinforcement technology are also introduced at the end of this paper. In this paper, the bridge pier is selected as the main research object, and the reinforcement effect of different carbon fiber reinforcement methods is compared by OpenSEES finite element software. The analysis methods include the following several kinds of methods. It is hoped that some of the views in this paper can provide reasonable suggestions for the bridge reinforcement design. The main results are as follows: (1) the results of dynamic time history analysis can truly reflect the seismic response of the structure, and the reinforcement effect is analyzed by comparing the displacement of pier top under earthquake. (2) pushover method is a static elastoplastic method used to evaluate the seismic performance of structures, which avoids the complexity of nonlinear dynamic analysis and has good accuracy. In this paper, the performance of the structure is compared by applying the concentrated force on the top of the pier by pushover method. (3) the hysteretic curve reflects the deformation characteristics and stiffness degradation of the structure in the process of repeated loading, and reflects the plastic deformation ability of the structure by the size of the area formed by the hysteresis loop.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.72

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