發(fā)布時(shí)間：2018-10-15 11:37

【摘要】：近年來,鋼管混凝土拱橋作為一種新穎的結(jié)構(gòu)型式,在我國(guó)得到迅猛發(fā)展。在豎向荷載作用下,拱肋將承受很大的軸向壓力及彎矩作用,采用鋼管混凝土材料非常合理,因?yàn)殇摴芑炷脸浞掷昧虽摴芎突炷羶煞N材料的特性及相互作用,從而使得這種組合材料具有承載力高、塑性好、造價(jià)低及施工方便等優(yōu)點(diǎn)。隨著結(jié)構(gòu)日益輕柔、長(zhǎng)大,鋼管混凝土拱橋在施工階段及成橋運(yùn)營(yíng)階段的穩(wěn)定問題逐漸顯現(xiàn)。目前,大多數(shù)學(xué)者對(duì)鋼管混凝土拱橋的穩(wěn)定性進(jìn)行分析時(shí),沒有考慮非線性靜風(fēng)荷載,即使部分考慮非線性靜風(fēng)荷載的分析大多數(shù)情況下也只單獨(dú)的考慮了拱肋或者主梁承受的靜風(fēng)荷載,忽略了拱梁共同承受風(fēng)荷載的影響,同時(shí)大部分研究中沒有考慮材料非線性的影響。本論文利用有限元分析軟件,著重研究大跨徑鋼管混凝土拱橋的靜風(fēng)極限風(fēng)速和結(jié)構(gòu)失穩(wěn)行為全過程變形曲線及穩(wěn)定性的影響因素,基于風(fēng)洞試驗(yàn)和CFD數(shù)值模擬數(shù)據(jù)對(duì)重慶菜園壩長(zhǎng)江大橋主橋進(jìn)行實(shí)橋模擬計(jì)算,從而對(duì)所得結(jié)論進(jìn)行驗(yàn)證。主要研究?jī)?nèi)容如下:1)對(duì)鋼管混凝土結(jié)構(gòu)的發(fā)展、研究現(xiàn)狀和抗風(fēng)理論做了總的概述。2)對(duì)幾何非線性、材料非線性和靜風(fēng)荷載非線性的分析方法做了總的概述。3)對(duì)考慮幾何非線性、材料非線性和靜風(fēng)荷載非線性下的靜力失穩(wěn)問題求解做了機(jī)理分析。4)通過APDL語(yǔ)言編程對(duì)重慶菜園壩長(zhǎng)江大橋主橋進(jìn)行實(shí)橋模擬計(jì)算,進(jìn)行了該橋靜風(fēng)失穩(wěn)的全過程分析。5)研究了靜風(fēng)荷載下初始風(fēng)攻角、矢跨比、橫撐數(shù)量及形式、風(fēng)荷載作用形式等影響因素對(duì)拱橋靜風(fēng)穩(wěn)定性的影響。
[Abstract]:In recent years, concrete-filled steel tubular arch bridge, as a new type of structure, has been developed rapidly in China. Under the vertical load, the arch rib will bear great axial pressure and bending moment. It is very reasonable to use concrete filled steel tube material, because the concrete filled steel tube makes full use of the characteristics and interaction between steel tube and concrete material. Therefore, the composite material has the advantages of high bearing capacity, good plasticity, low cost and convenient construction. As the structure grows softer and softer, the stability of concrete-filled steel tubular arch bridge appears gradually in the construction stage and the operation stage of the bridge. At present, when most scholars analyze the stability of concrete-filled steel tubular arch bridge, the nonlinear static wind load is not considered. Even if the nonlinear static wind load is partially considered, the static wind load of arch rib or main beam is considered only in most cases, and the influence of wind load on arch beam is neglected. At the same time, the influence of material nonlinearity is not considered in most of the studies. In this paper, the finite element analysis software is used to study the static wind limit wind speed and structural instability behavior of long-span concrete-filled steel tube arch bridge. Based on the wind tunnel test and CFD numerical simulation data, the actual bridge simulation of the main bridge of Caiyuanba Yangtze River Bridge in Chongqing is carried out, and the conclusions obtained are verified. The main research contents are as follows: 1) the development of concrete-filled steel tubular structures, the present situation of research and the theory of wind resistance are summarized. 2) the geometric nonlinearity, The analysis methods of material nonlinearity and static wind load nonlinearity are summarized. 3) considering geometric nonlinearity, The mechanism of solving the static instability problem under nonlinear static wind load and material nonlinearity is analyzed. 4) the real bridge simulation calculation of the main bridge of Chongqing Caiyuanba Yangtze River Bridge is carried out by APDL programming. In this paper, the whole process of static wind instability of the bridge is analyzed. 5) the influence factors on the static wind stability of the arch bridge are studied, such as the initial wind attack angle, the rise-span ratio, the number and form of transverse brace, the form of wind load, and so on.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U448.22

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