【摘要】：混凝土斜拉橋的溫度效應(yīng)將產(chǎn)生結(jié)構(gòu)應(yīng)力與變形,影響橋梁的安全運(yùn)營(yíng),對(duì)橋梁溫度場(chǎng)開(kāi)展研究具有實(shí)際工程意義。基于九江大橋斜拉橋結(jié)構(gòu)健康監(jiān)測(cè)系統(tǒng),采用連續(xù)觀測(cè)的方法對(duì)該橋溫度場(chǎng)進(jìn)行了長(zhǎng)期觀測(cè),得到了九江大橋箱梁和橋塔的溫度數(shù)據(jù)。采用統(tǒng)計(jì)技術(shù)和溫度場(chǎng)全壽命模擬技術(shù),對(duì)測(cè)點(diǎn)日溫度變化、年溫度變化以及橋梁溫度場(chǎng)全壽命模擬進(jìn)行了研究,并對(duì)橋塔溫度效應(yīng)引起拉索拉力變化進(jìn)行了有限元分析。本文主要研究?jī)?nèi)容如下:(1)根據(jù)G325九江大橋結(jié)構(gòu)健康監(jiān)測(cè)系統(tǒng)與長(zhǎng)期觀測(cè)獲得的溫度場(chǎng)數(shù)據(jù),采用局部平均插補(bǔ)法得到了箱梁典型截面5個(gè)不同測(cè)點(diǎn)(JM21--JM25)一年的全部溫度數(shù)據(jù)。(2)對(duì)進(jìn)行補(bǔ)償后的年度數(shù)據(jù)進(jìn)行分析,獲得了J M2不同測(cè)點(diǎn)全年溫度概率密度分布與溫度樣本JM22的典型日變化曲線;根據(jù)整年的實(shí)測(cè)月極值,采用最小二乘估計(jì)法,對(duì)月極值模型進(jìn)行了研究。(3)采用數(shù)值逆變換抽樣與溫度樣本調(diào)整理論,建立了G325九江大橋斜拉橋箱梁溫度場(chǎng)全壽命年模擬方法,得到了九江大橋全壽命樣本模型與溫差模型,該模擬生成的溫度場(chǎng)可應(yīng)用于G325九江大橋混凝土箱梁的全壽命溫度效應(yīng)分析。(4)采用ANS YS有限元軟件,建立了G3 25九江大橋橋塔的二維有限元模型,對(duì)橋塔兩側(cè)溫差引起的拉索拉力變化進(jìn)行了分析。
[Abstract]:The temperature effect of concrete cable-stayed bridge will produce structural stress and deformation and affect the safe operation of the bridge. It is of practical engineering significance to study the temperature field of the bridge. Based on the structural health monitoring system of the cable-stayed bridge of Jiujiang Bridge, the temperature field of the bridge was observed for a long time by continuous observation, and the temperature data of box girder and tower of Jiujiang Bridge were obtained. The daily temperature variation, annual temperature change and the whole life simulation of bridge temperature field are studied by means of statistical technique and full-life simulation technique of temperature field, and the finite element analysis of cable tension caused by temperature effect of bridge tower is carried out. The main contents of this paper are as follows: (1) according to the temperature field data obtained from the G325 Jiujiang Bridge structural health monitoring system and long-term observation, The local average interpolation method is used to get the whole temperature data of five different measuring points (JM21--JM25) of box girder in one year. (2) the annual data after compensation are analyzed. The typical diurnal variation curves of temperature probability density distribution and temperature sample JM22 at different measuring points of J M2 are obtained, and the least square estimation method is used according to the measured monthly extremum of the whole year. The monthly extreme value model is studied. (3) by using the theory of numerical inversion sampling and temperature sample adjustment, the full-life simulation method of temperature field of box girder of G325 Jiujiang Bridge is established, and the full-life sample model and temperature difference model of Jiujiang Bridge are obtained. The temperature field generated by the simulation can be applied to the whole life temperature effect analysis of the concrete box girder of G325 Jiujiang Bridge. (4) the two-dimensional finite element model of the tower of the G325 Jiujiang Bridge is established by using ANS YS finite element software. The variation of cable tension caused by the temperature difference between the two sides of the bridge tower is analyzed.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441.5;U448.27

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 王世成;橋梁結(jié)構(gòu)非線性溫度分析與后處理系統(tǒng)開(kāi)發(fā)[D];長(zhǎng)安大學(xué);2004年

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本文編號(hào)：2221197