【摘要】：由于橋梁健康監(jiān)測與評估系統(tǒng)相對于傳統(tǒng)的橋梁檢測方法具有長期性、實(shí)時性、高效性等顯著優(yōu)勢,近些年來被廣泛應(yīng)用到各類重要橋梁上,受到橋梁工作者的廣泛認(rèn)可。然而,長期、高頻的監(jiān)測產(chǎn)生海量的健康監(jiān)測數(shù)據(jù),如何基于這些監(jiān)測數(shù)據(jù),完成對監(jiān)測橋梁技術(shù)狀況的評定是國內(nèi)外學(xué)者致力解決的問題之一。現(xiàn)有基于健康監(jiān)測技術(shù)狀況評定方法多采用層次分析原理建立監(jiān)測橋梁的層次分析模型,根據(jù)底層指標(biāo)的評定結(jié)果逐層分析、匯總至頂層,完成監(jiān)測橋梁技術(shù)狀況的評定。但是由于該方法存在權(quán)重分配的問題,容易導(dǎo)致某一權(quán)重指標(biāo)失效時總體評定結(jié)果變化結(jié)果較小,不符合工程實(shí)際情況。鑒于此,本文基于面向?qū)ο笏枷牒托崩瓨蛩髁?yōu)化影響矩陣法,提出了適用于基于健康監(jiān)測的懸索橋技術(shù)狀況評定方法,并將該方法用于青草背長江大橋健康狀態(tài)評估,證明了該方法的適用性、有效性。本文主要開展了以下工作:①對青草背長江大橋健康監(jiān)測實(shí)測樣本數(shù)據(jù)進(jìn)行統(tǒng)計分析,得到了青草背長江大橋主纜索力、吊桿拉力、主梁位移、主梁應(yīng)變及索塔應(yīng)變隨時間變化規(guī)律,并嘗試對監(jiān)測數(shù)據(jù)中的溫度效應(yīng)進(jìn)行剝離,著重對車輛荷載下各監(jiān)測變量的響應(yīng)進(jìn)行分析。②通過對現(xiàn)有基于橋梁健康監(jiān)測的技術(shù)狀況評定方法研究分析,提出了面向?qū)ο蟮膽宜鳂蚣夹g(shù)狀況評定方法,建立了青草背長江大橋?qū)ο笙到y(tǒng)。借鑒斜拉橋索力優(yōu)化影響矩陣法,推導(dǎo)出了橋梁健康監(jiān)測系統(tǒng)的影響方程,證明了各監(jiān)測變量之間的內(nèi)在聯(lián)系。③提出了采用m維空間內(nèi)的“超橢球”面作為橋梁健康監(jiān)測系統(tǒng)的預(yù)警閥值,并據(jù)此建立了一種新的橋梁技術(shù)狀況評定方法。④基于青草背長江大橋健康監(jiān)測數(shù)據(jù),分別采用本文提出方法和層次分析法對青草背長江大橋技術(shù)狀況進(jìn)行評定,分析了本文提出方法的優(yōu)勢。
[Abstract]:Compared with the traditional bridge detection methods, bridge health monitoring and evaluation system has many advantages, such as long-term, real-time, high efficiency and so on. In recent years, it has been widely used in all kinds of important bridges and widely recognized by bridge workers. However, long-term, high-frequency monitoring produces massive health monitoring data, based on these monitoring data, how to complete the monitoring of bridge technical status evaluation is one of the domestic and foreign scholars to solve the problem. The existing methods based on health monitoring technology status assessment mostly adopt the principle of hierarchical analysis to establish the monitoring bridge AHP model. According to the evaluation results of the bottom index layer by layer, it is summarized to the top layer to complete the evaluation of the monitoring bridge technical status. However, due to the problem of weight distribution in this method, it is easy to cause the change of the overall evaluation result when a certain weight index is invalid, which does not accord with the actual engineering situation. In view of this, based on the Object-Oriented idea and the cable force optimization influence matrix method of cable-stayed bridge, this paper puts forward a method for evaluating the technical condition of suspension bridge based on health monitoring, and applies this method to the health assessment of Qingcaobei Yangtze River Bridge. The applicability and validity of the method are proved. The main work of this paper is as follows: 1. Through statistical analysis of the sample data of the health monitoring of the Qingcaobei Yangtze River Bridge, the main cable force, suspender pull force and main beam displacement of the Qingcaobei Yangtze River Bridge are obtained. The strain of the main beam and the strain of the cable tower vary with time, and try to peel off the temperature effect in the monitoring data. The response of each monitoring variable under vehicle load is analyzed emphatically. 2 through the research and analysis of the existing technical condition assessment method based on bridge health monitoring, an object-oriented evaluation method for the technical condition of suspension bridge is put forward. The object system of Qingcao back Yangtze River Bridge is established. The influence equation of bridge health monitoring system is derived by using the influence matrix method of cable force optimization for cable-stayed bridge. It is proved that the internal relation among the monitoring variables. 3 the "super ellipsoid" surface in m dimensional space is used as the early warning threshold of the bridge health monitoring system. Based on the health monitoring data of Qingcaobei Yangtze River Bridge, this paper presents the method and the Analytic hierarchy process (AHP) to evaluate the technical status of Qingcaobei Yangtze River Bridge. The advantages of the proposed method are analyzed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446;U448.25

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本文編號：2382286