本文關(guān)鍵詞： 柱板式空心墩 溫度梯度 溫度場 溫度效應(yīng)　出處：《蘭州交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：柱板式空心墩是近來橋梁設(shè)計中所采用的一種新型橋墩構(gòu)造形式,自然環(huán)境中混凝土空心墩受太陽輻射、寒潮降溫、氣溫變化等因素影響將產(chǎn)生不利的溫度效應(yīng)。但目前規(guī)范中關(guān)于溫度場與溫度應(yīng)力的規(guī)定僅局限于上部結(jié)構(gòu),缺少對橋墩結(jié)構(gòu)溫度場的研究。因此,應(yīng)對新型柱板式空心墩溫度場與溫度效應(yīng)進行試驗與研究。本文以縱目溝特大橋5#橋墩作為工程背景,結(jié)合橋墩溫度場的現(xiàn)場觀測數(shù)據(jù),分析研究了日照輻射與寒潮降溫作用對柱板式空心墩的影響。本文主要研究內(nèi)容與成果如下:①分別選取夏季與冬季中橋墩溫度場觀測代表性數(shù)據(jù)進行分析,繪制橋墩溫度測點變化曲線,分析各測點隨時間及沿壁厚與沿墩高方向的變化規(guī)律;②假定空心墩沿壁厚溫差曲線按指數(shù)函數(shù)分布,對實測數(shù)據(jù)進行函數(shù)擬合,提出適合西北地區(qū)或與西北地區(qū)氣候相似區(qū)域的柱板式空心墩正負溫度梯度參數(shù)建議值,并通過誤差分析,證明了參數(shù)取值的合理性;③根據(jù)橋墩溫度場實測數(shù)據(jù)反算熱力學(xué)參數(shù),參考國內(nèi)外研究資料,對橋墩熱-結(jié)構(gòu)分析的物理參數(shù)取值進行了計算;④根據(jù)溫度場實測數(shù)據(jù)并結(jié)合規(guī)范方法合理確定橋墩溫度荷載,利用有限元軟件ANSYS中三維瞬態(tài)熱-結(jié)構(gòu)耦合分析功能,進行柱板式空心墩在日照輻射和寒潮降溫作用下的溫度場與溫度應(yīng)力分析,得到溫度應(yīng)力分布規(guī)律。
[Abstract]:Column slab hollow pier is a new type of bridge pier structure used in the recent bridge design. In the natural environment concrete hollow pier is exposed to solar radiation and cold wave. However, the regulation of temperature field and temperature stress in the current code is limited to the superstructure, and there is no research on the temperature field of the bridge pier structure. The temperature field and temperature effect of new type column slab hollow pier should be tested and studied. In this paper, the Pier of Longmugou Bridge is taken as the engineering background, and the field observation data of the temperature field of the pier are combined. The effects of sunshine radiation and cold wave cooling on the column slab hollow pier are analyzed. The main contents and results of this paper are as follows: 1. Select the representative data of temperature field observation in summer and winter respectively. The curve of temperature measuring point of bridge pier is drawn, and the variation law of each measuring point with time, along wall thickness and along pier height is analyzed. (2) assuming that the hollow pier is distributed according to exponential function along the wall thickness and temperature difference curve, the measured data are fitted by function. The positive and negative temperature gradient parameters of hollow piers suitable for the northwest region or similar to those in the northwest region are proposed, and the rationality of the parameters is proved by error analysis. (3) based on the measured data of piers temperature field, the physical parameters of the thermal-structural analysis of the piers are calculated with reference to the domestic and foreign research data. 4According to the measured data of temperature field and combining with the code method, the temperature load of bridge pier is reasonably determined, and the three-dimensional transient thermal-structural coupling analysis function is used in the finite element software ANSYS. The temperature field and temperature stress of column slab hollow pier under sunshine radiation and cold wave cooling were analyzed and the distribution of temperature stress was obtained.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.5

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