發(fā)布時間：2018-02-10 05:05

  本文關(guān)鍵詞： 結(jié)構(gòu)健康監(jiān)測 狀態(tài)評估 溫度 縱向位移 靜應(yīng)變　出處：《東南大學》2015年碩士論文　論文類型：學位論文

【摘要】：國內(nèi)外不少學者已展開了基于整體動力特性的橋梁結(jié)構(gòu)狀態(tài)評估,但是由于橋梁結(jié)構(gòu)復(fù)雜、體量巨大、局部損傷的不敏感性以及環(huán)境因素的影響,基于動力參數(shù)的監(jiān)測難以有效應(yīng)用于結(jié)構(gòu)狀態(tài)評估。基于靜態(tài)監(jiān)測數(shù)據(jù)的橋梁結(jié)構(gòu)狀態(tài)評估和預(yù)警方法研究對其安全運營具有重要意義,是目前大跨橋梁健康監(jiān)測領(lǐng)域的熱點。結(jié)構(gòu)健康監(jiān)測系統(tǒng)在大跨橋梁上的成功實施為保證橋梁結(jié)構(gòu)的安全性、適用性、耐久性提供良好的平臺。隨著實時監(jiān)測數(shù)據(jù)的不斷積累,有效分析和處理海量健康監(jiān)測數(shù)據(jù),建立環(huán)境作用、交通荷載等與橋梁結(jié)構(gòu)輸出狀態(tài)間關(guān)系的響應(yīng)機理、提升橋梁結(jié)構(gòu)設(shè)計水平和分析技術(shù)是健康監(jiān)測領(lǐng)域的重要問題。本文以高速鐵路橋梁大勝關(guān)長江大橋為研究對象,基于健康監(jiān)測系統(tǒng)獲取的監(jiān)測數(shù)據(jù),系統(tǒng)研究了橋梁溫度、縱向位移、靜應(yīng)變與環(huán)境荷載作用相關(guān)模型,準確建立了環(huán)境荷載作用下的結(jié)構(gòu)狀態(tài)評估及預(yù)警方法研究,主要內(nèi)容包括：(1)系統(tǒng)地研究了大勝關(guān)長江大橋連續(xù)鋼拱桁梁2013年的溫度監(jiān)測數(shù)據(jù),采用極值分析和統(tǒng)計分析方法詳細考察了鋼拱桁梁的溫度分布特征和溫差分布特征,后利用統(tǒng)計學方法對邊桁拱整體豎向溫差和桿構(gòu)件橫截面溫差的正溫差和負溫差樣本分別進行概率統(tǒng)計特征分析,確定其Weibull概率密度函數(shù)的參數(shù)估計值,在此基礎(chǔ)上計算得出溫差標準值。(2)系統(tǒng)地研究了大勝關(guān)長江大橋支座縱向位移的變化特點及其相關(guān)性規(guī)律,支座縱向位移與溫度呈現(xiàn)出良好的線性關(guān)系,支座縱向位移與溫差呈現(xiàn)出一定的線性關(guān)系,采用多元線性回歸方程建立支座縱向位移與溫度場之間的線性相關(guān)特性,并利用拉格朗日插值建立不同支座縱向位移之間的線性相關(guān)特性,建立的數(shù)學模型可有效反映鋼桁拱梁在初始狀態(tài)的縱向伸縮性能,而且可以有效地模擬主梁縱向位移的變化規(guī)律；利用均值控制圖法來對梁端位移進行異常監(jiān)控,測試結(jié)果驗證了該方法的有效性。(3)系統(tǒng)地研究了南京大勝關(guān)長江大橋鋼桁橋靜應(yīng)變的變化規(guī)律,大勝關(guān)長江大橋主梁靜應(yīng)變主要由三部分組成：由溫度引起的靜應(yīng)變SⅠ、由溫差引起的靜應(yīng)變SⅡ,以及由列車荷載引起的靜應(yīng)變SⅢ,且由列車荷載引起的靜應(yīng)變顯著低于由溫度和溫差帶來的影響；引入小波包分解技術(shù)剔除由車輛荷載引起的靜應(yīng)變效應(yīng)并提取出由溫度場引起的靜應(yīng)變效應(yīng),然后采用數(shù)學建模方法建立靜應(yīng)變與溫度場之間的多元線性回歸模型,并進一步利用主成分分析方法簡化多元線性回歸模型的分析變量。最后提出三種大勝關(guān)長江大橋的靜力承載性能退化規(guī)律來對大勝關(guān)長江大橋的靜力承載性能進行評估。
[Abstract]:Many scholars at home and abroad have carried out the state assessment of bridge structure based on the global dynamic characteristics. However, due to the complexity of the bridge structure, huge volume, insensitivity of local damage and the influence of environmental factors, many scholars at home and abroad have carried out the assessment of bridge structure. Monitoring based on dynamic parameters is difficult to be effectively applied to structural state assessment. The study of bridge structure state assessment and early warning method based on static monitoring data is of great significance to its safe operation. The successful implementation of structural health monitoring system on long-span bridges provides a good platform for ensuring the safety, applicability and durability of bridge structures. With the continuous accumulation of real-time monitoring data, the structural health monitoring system is a hot spot in the field of health monitoring of long-span bridges. To analyze and deal with the massive health monitoring data effectively, to establish the response mechanism of the relationship between the environmental function, traffic load and the output state of the bridge structure. It is an important problem in the field of health monitoring to improve the design level and analysis technology of bridge structure. This paper takes the Dashengguan Yangtze River Bridge of high-speed railway bridge as the research object, based on the monitoring data obtained by the health monitoring system, systematically studies the bridge temperature. The model of longitudinal displacement, static strain and environmental load is established, and the structural state evaluation and early warning method under the action of environmental load are established accurately. The temperature monitoring data of continuous steel arch truss beam of Dashengguan Yangtze River Bridge on 2013 are studied systematically. The temperature distribution and temperature difference distribution characteristics of steel arch truss beam are investigated in detail by extreme value analysis and statistical analysis. Then the positive and negative temperature difference samples of the whole vertical temperature difference of side truss arch and the cross section temperature difference of bar member are analyzed by statistical method, and the parameter estimation value of Weibull probability density function is determined. On this basis, the standard value of temperature difference is obtained.) the variation characteristics of the longitudinal displacement of the support of the Dashengguan Yangtze River Bridge and its correlation law are systematically studied. The longitudinal displacement of the support has a good linear relationship with the temperature. There is a linear relationship between the longitudinal displacement of the bearing and the temperature difference. The linear correlation between the longitudinal displacement of the bearing and the temperature field is established by using the multivariate linear regression equation. The linear correlation between the longitudinal displacement of different supports is established by Lagrange interpolation. The established mathematical model can effectively reflect the longitudinal scalability of steel truss arch beam in the initial state. Moreover, it can effectively simulate the variation law of longitudinal displacement of the main beam, and use the mean value control chart method to monitor the displacement of the end of the beam. The test results verify the validity of this method. (3) the static strain of the steel truss bridge of the Dashengguan Yangtze River Bridge in Nanjing is studied systematically. The static strain of the main girder of the Dashengguan Yangtze River Bridge is mainly composed of three parts: the static strain S 鈪，

本文編號：1499724