【摘要】：長(zhǎng)時(shí)間暴露在太陽輻射以及環(huán)境因素下的橋梁結(jié)構(gòu)由于溫度變化而引起非線性溫度分布不均勻,會(huì)造成顯著溫度效應(yīng)的影響。研究表明,隨時(shí)間變化的溫度載荷作用下,大跨度橋梁將產(chǎn)生非常嚴(yán)重溫度效應(yīng)：當(dāng)溫度變化引起的頻率變化達(dá)到4%時(shí),結(jié)構(gòu)剛度響應(yīng)將達(dá)到8%的變化。在強(qiáng)烈的溫度荷載的作用下,大型橋梁結(jié)構(gòu)在使用期時(shí)同樣易于引起強(qiáng)烈的非線性熱效應(yīng),因此會(huì)導(dǎo)致非常嚴(yán)重的應(yīng)力集中以及變形,這會(huì)進(jìn)一步導(dǎo)致橋梁結(jié)構(gòu)發(fā)生退化甚至損傷,進(jìn)一步削弱橋梁的作用,不能滿足其適用性和耐久性。在某些情況下,可變溫度引起的結(jié)構(gòu)載荷并不比常規(guī)使用的荷載弱,并且在某些情況下,甚至決定著結(jié)構(gòu)安全。本文以新疆果子溝首座公路斜拉橋?yàn)楣こ瘫尘?對(duì)新疆嚴(yán)寒地區(qū)橋梁結(jié)構(gòu)受到溫度影響時(shí)的力學(xué)行為進(jìn)行分析。首先介紹了斜拉橋,以及研究目的、意義,以及工程的背景和研究方法的現(xiàn)狀與發(fā)展。搜集了國內(nèi)外文獻(xiàn)對(duì)溫度研究的深度,在理論研究、實(shí)測(cè)研究以及目前較為關(guān)注的問題做以詳細(xì)的闡述,并整理了各國公路橋涵規(guī)范對(duì)溫度作用的影響規(guī)定。對(duì)橋梁溫度荷載的形成原因、主要影響因素、分類及特點(diǎn)一一論述,并介紹了目前較為常用的溫度荷載理論計(jì)算公式。介紹了以果子溝大橋?yàn)楣こ桃劳械腗idas/Civil鋼桁梁模型建立,并簡(jiǎn)要介紹Midas/Civil軟件在溫度分析方面的功能和分類,采用升高鋼桁梁上部溫度模擬太陽垂直照射鋼桁梁時(shí),鋼桁梁本身、索塔、斜拉索應(yīng)力、位移、變化值并進(jìn)行細(xì)致分析,得到一定結(jié)論。對(duì)國內(nèi)橋梁墩塔溫度作用的研究進(jìn)展和溫度應(yīng)力計(jì)算理論做簡(jiǎn)單介紹,并依托果子溝斜拉橋?yàn)楣こ瘫尘敖⑺魉䴗囟饶Ｐ?按照規(guī)范進(jìn)行三種工況下索塔自身、對(duì)鋼桁梁、斜拉索索力影響都做了詳細(xì)計(jì)算分析并得出一定結(jié)論。討論了年均勻溫差和體系溫差對(duì)橋梁的影響,通過對(duì)比索塔,主梁,斜拉索索力影響得出相關(guān)結(jié)論。
[Abstract]:The nonlinear temperature distribution of bridge structures exposed to solar radiation and environmental factors for a long time is uneven due to temperature variation, which will cause significant temperature effects. The results show that the temperature effect of the long-span bridge will be very serious under the influence of temperature load with time: when the frequency change due to the temperature change reaches 4, the stiffness response of the structure will reach 8% change. Under the action of strong temperature load, the large bridge structure is easy to cause strong nonlinear thermal effect in the service life, so it will lead to very serious stress concentration and deformation. This will further lead to the degradation or damage of bridge structure, further weaken the role of bridge, and can not meet its applicability and durability. In some cases, the structural load caused by variable temperature is not weaker than the conventional load, and in some cases, it even determines the safety of the structure. Based on the engineering background of the first highway cable-stayed bridge in Jiegou, Xinjiang, the mechanical behavior of the bridge structure under the influence of temperature is analyzed in this paper. At first, the paper introduces the cable-stayed bridge, the purpose and significance of the research, the background of the project and the present situation and development of the research methods. The depth of temperature research in domestic and foreign literature is collected, the theoretical research, the actual measurement research and the problems concerned at present are elaborated in detail, and the influence regulations of highway bridge and culvert codes on the effect of temperature in various countries are sorted out. In this paper, the causes, main influencing factors, classification and characteristics of the temperature load of the bridge are discussed, and the theoretical formulas of the temperature load are introduced. This paper introduces the establishment of Midas/Civil steel truss model based on Shuigou Bridge, and briefly introduces the function and classification of Midas/Civil software in temperature analysis. When the upper temperature of steel truss beam is raised to simulate the vertical sun irradiating steel truss beam, The stress, displacement and variation of steel truss itself, cable tower and cable are analyzed and some conclusions are obtained. This paper briefly introduces the research progress and the theory of temperature stress calculation of bridge pier tower in China, and establishes the temperature model of cable tower based on Shuigou cable-stayed bridge for engineering background. According to the code, the temperature model of cable tower is established under three working conditions, and the steel truss beam is made. The influence of cable-stayed cable force is calculated and analyzed in detail and a certain conclusion is drawn. The effects of annual uniform temperature difference and system temperature difference on the bridge are discussed.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.5;U448.27

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 樊啟武;錢永久;;采用間接耦合法分析斜拉橋索塔瞬態(tài)溫度應(yīng)力場(chǎng)[J];石家莊鐵道學(xué)院學(xué)報(bào)(自然科學(xué)版);2008年01期

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本文編號(hào)：2375608