本文選題：鋼管混凝土　切入點(diǎn)：系桿拱橋　出處：《蘭州交通大學(xué)》2014年碩士論文

【摘要】：在鋼管混凝土結(jié)構(gòu)中，鋼管對(duì)混凝土的約束效應(yīng)使鋼材和混凝土彌補(bǔ)了彼此缺點(diǎn)，從而充分發(fā)揮各自的優(yōu)點(diǎn)。近些年來，鋼管混凝土在我國橋梁建設(shè)中得到廣泛應(yīng)用，修建了大量鋼管混凝土拱橋。鋼管混凝土系桿拱橋中，吊桿將荷載傳遞給拱肋，最終拱肋將荷載傳遞給支座，絕大部分荷載是通過拱肋傳遞到支座的。拱肋安全直接影響橋梁結(jié)構(gòu)的工作性能，所以研究拱肋結(jié)構(gòu)的受力非常重要。 本文以蘭新二線烏魯木齊河特大橋?yàn)楣こ瘫尘�，�?duì)下承式鋼管混凝土系桿拱橋拱肋受力性能進(jìn)行了研究，主要完成以下工作： 介紹了大橋施工工藝以及鋼管混凝土軸心受壓構(gòu)件的工作性能，詳細(xì)闡述了啞鈴型鋼管混凝土拱肋在施工過程中的受力特點(diǎn)。利用有限元軟件Midas/Civil建立了全橋模型，對(duì)拱肋在各施工階段、成橋階段以及運(yùn)營階段的受力進(jìn)行研究，總結(jié)了拱肋受力規(guī)律。在成橋階段，，拱肋應(yīng)力范圍為-(65~106)MPa，拱肋鋼管承擔(dān)拱肋總內(nèi)力中的56%～58%，下弦管混凝土承擔(dān)20%～25%，上弦管混凝土承擔(dān)19%～22%。運(yùn)營階段，拱肋鋼管應(yīng)力范圍為-(112~190)MPa。比較分析了理論分析值與現(xiàn)場(chǎng)實(shí)測(cè)值的差異，得出鋼管應(yīng)力產(chǎn)生偏差的原因是流動(dòng)性良好的泵送混凝土存在較大的流體壓力。 分析了不同拱肋混凝土灌注順序?qū)袄呤芰Φ挠绊�，�?dāng)灌注順序不同時(shí)，拱肋同一截面內(nèi)力不變，但應(yīng)力不同。如果以拱肋應(yīng)力作為評(píng)價(jià)灌注順序優(yōu)劣的標(biāo)準(zhǔn)，先灌注上弦管混凝土，后灌注下弦管混凝土的施工順序是比較合理的。 分析了拱肋支架拆除時(shí)間不同對(duì)拱肋受力的影響，得出先灌注后拆拱肋支架的順序是比較合理的，其鋼管應(yīng)力降低10%~19%，上、下弦管混凝土應(yīng)力增大12%~30%，拱肋鋼管承擔(dān)拱肋總內(nèi)力的46%～48%，下弦管承擔(dān)24%～27%，上弦管承擔(dān)25%～28%。
[Abstract]:In concrete filled steel tube (CFST) structures, the restraint effect of steel tube on concrete makes steel and concrete make up for each other's shortcomings, thus giving full play to their respective advantages. In recent years, CFST has been widely used in the construction of bridges in China. A large number of concrete-filled steel tubular arch bridges have been built. In the concrete-filled steel tubular tied arch bridge, the suspender transfers the load to the arch rib, and finally the arch rib transfers the load to the support. Most of the loads are transferred to the support through the arch rib. The safety of the arch rib directly affects the performance of the bridge structure, so it is very important to study the force of the arch rib structure. In this paper, based on the engineering background of Lanxin No. 2 Urumqi River Bridge, the mechanical behavior of arch rib of through concrete-filled steel tubular tied arch bridge is studied. The main work is as follows:. This paper introduces the construction technology of the bridge and the working performance of the concrete filled steel tube (CFST) members under axial compression. The stress characteristics of the dumbbell-shaped concrete-filled steel tube arch ribs during the construction process are described in detail. The full-bridge model is established by using the finite element software Midas/Civil. The stress of arch rib in construction stage, bridge stage and operation stage is studied, and the force law of arch rib is summarized. The stress range of arch rib is-65 / 106 MPA, the steel pipe of arch rib bears 56 / 58 of the total internal force of arch rib, the concrete of lower chord tube bears 20 / 25, and the concrete of upper chord pipe bears 1922. In the operation stage, the stress range of arch rib steel pipe is -112m / 190MPa. The difference between the theoretical analysis value and the field measured value is compared and analyzed. It is concluded that the deviation of steel tube stress is due to the large fluid pressure of pumping concrete with good fluidity. The influence of different pouring order of arch rib concrete on the stress of arch rib is analyzed. When the sequence of pouring is different, the internal force of the same section of arch rib is unchanged, but the stress is different. If the stress of arch rib is taken as the criterion to evaluate the order of pouring, It is reasonable to pour the upper chord concrete first and the lower chord concrete later. This paper analyzes the influence of different time of removing arch rib support on the stress of arch rib, and concludes that the order of removing arch rib support after pouring first is reasonable, and the stress of steel tube is reduced by 10% and 19%. The concrete stress of the lower chord tube is increased by 12% and 30%, the arch rib steel pipe bears 46% of the total internal force of the arch rib, the lower chord assumes 24% 27 and the upper string bears 25% and 28% of the total internal force of the arch rib.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.225

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本文編號(hào)：1691894