【摘要】：基于健康監(jiān)測系統(tǒng)的橋梁結(jié)構(gòu)狀態(tài)預(yù)警與評估是目前國內(nèi)外學(xué)術(shù)界和工程界的熱點(diǎn)研究領(lǐng)域。如何有效地處理、分析和解讀橋梁結(jié)構(gòu)健康監(jiān)測系統(tǒng)采集的長期海量數(shù)據(jù),在此基礎(chǔ)上建立橋梁結(jié)構(gòu)的損傷狀態(tài)預(yù)警方法、研究橋梁結(jié)構(gòu)的損傷累積及演化規(guī)律、開展橋梁結(jié)構(gòu)安全狀態(tài)評估是橋梁結(jié)構(gòu)健康監(jiān)測所面臨的重要科學(xué)問題。本文以南溪長江大橋懸索橋的伸縮縫為研究對象,以溫度與伸縮縫位移監(jiān)測數(shù)據(jù)為基礎(chǔ),開展了基于長期健康監(jiān)測數(shù)據(jù)的大跨橋梁伸縮縫狀態(tài)分析與評估的方法與應(yīng)用研究。本文的主要工作和成果如下:(1)通過南溪長江大橋的健康監(jiān)測系統(tǒng),獲取南溪長江大橋溫度、位移的數(shù)據(jù),并對數(shù)據(jù)進(jìn)行整理與分析,得到連續(xù)的、完整的環(huán)境溫度、結(jié)構(gòu)溫度及溫度變形數(shù)據(jù)以及伸縮縫位移數(shù)據(jù),為理論分析研究奠定了基礎(chǔ)。(2)通過南溪長江大橋的溫度監(jiān)測數(shù)據(jù),分析南溪長江大橋環(huán)境溫度與結(jié)構(gòu)溫度關(guān)系,研究了橋梁頂板、底板及腹板結(jié)構(gòu)溫度隨環(huán)境溫度變化規(guī)律。(3)通過南溪長江大橋的伸縮縫位移監(jiān)測數(shù)據(jù),對伸縮縫位移數(shù)據(jù)進(jìn)行概率統(tǒng)計(jì)分析,得出伸縮縫位移的概率模型;并通過伸縮縫一年中178天的位移最大值與最小值進(jìn)行極值估計(jì),對南溪長江大橋伸縮縫位移進(jìn)行極值預(yù)測。(4)分析了環(huán)境溫度對伸縮縫位移的影響規(guī)律,從而建立了基于長期監(jiān)測數(shù)據(jù)的環(huán)境溫度與伸縮縫位移模型。在此基礎(chǔ)上建立了“溫度環(huán)境條件歸一化”的伸縮縫損傷預(yù)警方法。
[Abstract]:The early warning and evaluation of bridge structure condition based on health monitoring system is a hot research field in academic and engineering circles at home and abroad. How to deal with, analyze and interpret the long-term massive data collected by the bridge structure health monitoring system effectively, and then establish the damage state warning method of the bridge structure, and study the damage accumulation and evolution law of the bridge structure. It is an important scientific problem for bridge structure health monitoring to evaluate the safety state of bridge structure. Taking the expansion joint of the suspension bridge of Nanxi Yangtze River Bridge as the research object and based on the monitoring data of temperature and displacement of the expansion joint, the method and application of the analysis and evaluation of the state of the expansion joint of the long-span bridge based on the long-term health monitoring data are studied in this paper. The main work and achievements of this paper are as follows: (1) through the health monitoring system of Nanxi Yangtze River Bridge, the temperature and displacement data of Nanxi Yangtze River Bridge are obtained, and the data are collated and analyzed to obtain continuous and complete ambient temperature. The structure temperature and temperature deformation data and the expansion joint displacement data lay the foundation for theoretical analysis and research. (2) through the temperature monitoring data of Nanxi Yangtze River Bridge, the relationship between environment temperature and structure temperature of Nanxi Yangtze River Bridge is analyzed. The variation of temperature of bridge roof, floor and web with ambient temperature is studied. (3) through the monitoring data of expansion joint displacement of Nanxi Yangtze River Bridge, the probability statistical analysis of expansion joint displacement data is carried out, and the probability model of expansion joint displacement is obtained. By estimating the maximum and minimum displacement of the expansion joint in 178 days of the year, the maximum value of the expansion joint displacement of Nanxi Yangtze River Bridge is predicted. (4) the influence of environment temperature on the displacement of the expansion joint is analyzed. A model of environmental temperature and displacement of expansion joints based on long-term monitoring data is established. On the basis of this, the damage warning method of expansion joint is established, which is "normalization of temperature and environmental conditions".
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446

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