【摘要】：橋梁結(jié)構(gòu)處在不斷變化的自然環(huán)境條件下,將不可避免地受到周?chē)h(huán)境的影響。周?chē)h(huán)境的影響主要體現(xiàn)在：太陽(yáng)日照輻射、周?chē)鷼鉁刈兓�。由于混凝土為熱的不良�?dǎo)體,橋梁結(jié)構(gòu)在太陽(yáng)輻射等作用下將產(chǎn)生非均勻溫度場(chǎng)。這種時(shí)刻變化的瞬態(tài)溫度場(chǎng)會(huì)在混凝土結(jié)構(gòu),特別是超靜定結(jié)構(gòu)體系中產(chǎn)生較大的溫度自應(yīng)力,從而對(duì)橋梁結(jié)構(gòu)的耐久性產(chǎn)生潛在威脅。交替變化的溫度場(chǎng)產(chǎn)生的溫度自應(yīng)力有時(shí)候甚至比結(jié)構(gòu)其他外荷載作用更大,因此揭示混凝土結(jié)構(gòu)溫度的分布規(guī)律,具有十分重要的理論意義和現(xiàn)實(shí)意義�，F(xiàn)場(chǎng)實(shí)測(cè)資料表明：不同地理環(huán)境條件和大氣環(huán)境條件對(duì)橋梁結(jié)構(gòu)的溫差應(yīng)力影響十分明顯。不同氣候條件、不同地區(qū)的混凝土溫度分布具有不同的特點(diǎn),特別是溫差較大的區(qū)域其溫差荷載對(duì)橋梁結(jié)構(gòu)的應(yīng)力狀態(tài)及位移撓度的影響更為明顯。我國(guó)河南林州太行山地區(qū)由于日照強(qiáng)烈,早晚溫差大,這種特殊的氣候條件對(duì)橋梁結(jié)構(gòu)的溫度場(chǎng)分布研究具有重要的意義。本文結(jié)合林州露水河特大橋,對(duì)橋梁結(jié)構(gòu)箱梁在典型日照溫差下的溫度分布狀態(tài)進(jìn)行觀測(cè)分析,并應(yīng)用ANSYS建立箱梁截面模型模擬其溫度分布,確定了符合林州太行山地區(qū)的溫度梯度分布模式,具有重要的理論意義和工程實(shí)用價(jià)值。本文運(yùn)用ANSYS軟件建立了露水河大橋在懸臂施工階段的三維實(shí)體模型,計(jì)算分析了溫度荷載對(duì)施工過(guò)程箱梁的豎向位移和縱向應(yīng)力的影響。最后,通過(guò)MIDAS/CIVIL建立露水河特大橋的三維梁?jiǎn)卧珮蚰Ｐ?計(jì)算分析了溫度荷載對(duì)成橋運(yùn)營(yíng)階段箱梁的豎向位移和縱向應(yīng)力的影響,認(rèn)為橋梁在運(yùn)營(yíng)階段的溫度效應(yīng)不容忽視,在設(shè)計(jì)中應(yīng)充分考慮溫度荷載效應(yīng)對(duì)橋梁結(jié)構(gòu)的影響。
[Abstract]:Under the changing natural environment, the bridge structure will inevitably be affected by the surrounding environment. The influence of the surrounding environment is mainly reflected in the solar radiation, the change of surrounding temperature and so on. Because concrete is a bad conductor of heat, the bridge structure will produce non-uniform temperature field under the action of solar radiation and so on. This kind of transient temperature field will produce large temperature self-stress in concrete structure, especially in statically inconstant structure system, which will pose a potential threat to the durability of bridge structure. The temperature self-stress produced by alternating temperature field is sometimes even greater than other external loads of the structure, so it is of great theoretical and practical significance to reveal the temperature distribution law of concrete structure. The field measured data show that the temperature difference stress of bridge structure is obviously affected by different geographical environment conditions and atmospheric environment conditions. The temperature distribution of concrete in different regions has different characteristics, especially in the area with large temperature difference, the influence of temperature difference load on the stress state and displacement deflection of bridge structure is more obvious. Due to the strong sunshine and large temperature difference between morning and evening in Taihang Mountain area of Linzhou, Henan Province, this special climatic condition is of great significance to the study of temperature field distribution of bridge structure. In this paper, combined with Linzhou Lushuihe Bridge, the temperature distribution of box girder of bridge structure under typical sunshine temperature difference is observed and analyzed, and the cross section model of box girder is established by ANSYS to simulate the temperature distribution. The temperature gradient distribution model in accordance with the Taihang Mountain area of Linzhou is determined, which is of great theoretical significance and practical value in engineering. In this paper, the three-dimensional solid model of Lushui River Bridge during cantilever construction is established by using ANSYS software, and the influence of temperature load on the vertical displacement and longitudinal stress of box girder during construction is calculated and analyzed. Finally, the three-dimensional beam element model of Lushuihe Bridge is established by MIDAS/CIVIL, and the influence of temperature load on the vertical displacement and longitudinal stress of box girder in the operation stage of the bridge is calculated and analyzed. It is considered that the temperature effect of the bridge in the operation stage can not be ignored, and the influence of the temperature load effect on the bridge structure should be fully considered in the design.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441.5;U448.23

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 李琛;預(yù)應(yīng)力連續(xù)剛構(gòu)橋施工預(yù)拱度設(shè)置和溫度應(yīng)力分析[D];重慶交通大學(xué);2017年

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本文編號(hào)：2492894