本文選題：獨(dú)柱墩　切入點(diǎn)：曲線橋　出處：《重慶交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：長(zhǎng)時(shí)間來(lái)，曲線橋的設(shè)計(jì)一直大都是參考已建橋梁，梁理論上不像直橋那么規(guī)范，甚至對(duì)于小半徑曲線橋來(lái)說(shuō)，常常按照直橋來(lái)設(shè)計(jì)，這是不合理的。對(duì)于中間為單鉸支座的獨(dú)柱墩曲線橋的研究更是少之又少，特別在“彎扭”耦合作用下，此類(lèi)橋梁容易傾覆，近幾年這種橋梁形式出現(xiàn)了幾次重大問(wèn)題事故，在設(shè)計(jì)時(shí)如何能夠保證運(yùn)營(yíng)橋梁正常使用成為了急需解決的問(wèn)題。本文針對(duì)于獨(dú)柱墩單點(diǎn)支承曲線橋容易傾覆的特點(diǎn)進(jìn)行了詳細(xì)的研究，分析了各種因素下，此類(lèi)橋梁的受力變化特征，并找出其對(duì)于傾覆性能的影響。 本文首先探究了曲線橋的受力特征、國(guó)內(nèi)外的研究現(xiàn)狀，以及國(guó)內(nèi)外此類(lèi)橋梁在運(yùn)營(yíng)時(shí)呈現(xiàn)的問(wèn)題，并論證了對(duì)此課題研究的必要性。闡述了曲線橋的各種理論計(jì)算方法，提出了各種可能會(huì)影響其抗傾覆性能的因素。 隨后本文通過(guò)工程實(shí)例，運(yùn)用MIDAS CIVEL有限元軟件進(jìn)行計(jì)算分析，找出了曲線橋支座的脫空規(guī)律，，并針對(duì)支座預(yù)偏心、支座間距、移動(dòng)荷載、支座布置形式以及溫度效應(yīng)等因素進(jìn)行了詳細(xì)的探討，分析了這幾種因素對(duì)曲線橋的抗傾覆的影響，說(shuō)明了此種考慮對(duì)為曲線橋防止出現(xiàn)“爬移”現(xiàn)象、出現(xiàn)支座脫空現(xiàn)象的重要性。 文章最后得到以下結(jié)論：獨(dú)柱墩曲線橋容易發(fā)生支座脫空現(xiàn)象，隨著移動(dòng)荷載的逐步增加，內(nèi)側(cè)支座反力迅速降低直至出現(xiàn)負(fù)反力造成支座脫空現(xiàn)象；在預(yù)偏心的設(shè)計(jì)時(shí)要注重多種因素結(jié)合考慮，不可只從單一方面著手；支座間距以及布置方式要結(jié)合實(shí)際工程，多方選擇以確定最好布置方式與間距；溫度效應(yīng)對(duì)曲線橋的抗傾覆穩(wěn)定性的影響也不可忽視。
[Abstract]:For a long time, the design of curved bridges has been mostly referred to the bridges built, and the beam is not as standard as the straight bridges in theory. Even for curved bridges with small radius, they are often designed according to the straight bridges. This is unreasonable. There is little research on single column pier curved bridge with single hinge support in the middle. Especially under the action of "bending and torsion" coupling, this kind of bridge is prone to overturn. In recent years, there have been several major problem accidents in this kind of bridge form. How to ensure the normal operation of the bridge has become an urgent problem in the design. In this paper, according to the characteristics of the single point supported curved bridge with single column pier, the easy capsizing of the bridge is studied in detail, and the various factors are analyzed. The force change characteristics of this kind of bridge and its influence on capsizing performance are found out. In this paper, the stress characteristics of curved bridges, the current research situation at home and abroad, and the problems in operation of this kind of bridges at home and abroad are discussed, and the necessity of the research on this subject is demonstrated, and the various theoretical calculation methods of curved bridges are expounded. Various factors which may affect its capsizing performance are put forward. Then, by using MIDAS CIVEL finite element software to calculate and analyze through the engineering example, find out the law of void removal of the support of the curved bridge, and aim at the bearing pre-eccentricity, support spacing, moving load, The bearing arrangement and temperature effect are discussed in detail, and the influence of these factors on the resistance to overturning of curved bridge is analyzed. It is shown that this kind of consideration can prevent the phenomenon of "climbing and shifting" for the curved bridge. The importance of the phenomenon of pedestal detachment. Finally, the following conclusions are obtained: the phenomenon of support void is easy to occur in the curved bridge with single column pier, and with the gradual increase of moving load, the reaction force of the inner support decreases rapidly until the negative reaction force results in the void phenomenon of the bearing; In the design of preeccentricity, many factors should be considered, not only from a single aspect, but also from a single aspect. The effect of temperature on the overturning stability of curved bridge can not be ignored.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.42

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