【摘要】：橋梁是道路交通網(wǎng)中的重要結(jié)構(gòu),也是各線路早日通車的關(guān)鍵,因此必須保證其在設(shè)計使用年限中安全運營。裝配式混凝土梁橋在實際工程中應(yīng)用廣泛,然而隨著時間的推移,由于受到各種各樣的外部環(huán)境因素影響,其結(jié)構(gòu)性能必將出現(xiàn)不同程度的下降,我們必須了解其工作狀態(tài),以便及時作出應(yīng)對措施。荷載試驗是工程師最常利用的手段,通過荷載試驗所得結(jié)果,可以對橋梁的工作狀態(tài)給出評價,同時也可以判斷橋梁的安全承載能力與營運質(zhì)量。本文提出了一種基于位移誤差的靜力參數(shù)識別算法,依托實橋成橋荷載試驗,建立實橋有限元模型,構(gòu)造實測撓度數(shù)據(jù)與模型計算值之間的位移誤差向量。并基于觀測自由度對靜力平衡方程進行推導(dǎo),構(gòu)造迭代方程,通過位移誤差的逐步減小,來獲取單元剛度的修正量,完成實橋模型的修正。同時,在確定損傷單元與最需要修正的參數(shù)時,本文提出了一種基于多元統(tǒng)計分析理論的待識別單元選擇的方法,計算各片梁撓度實測數(shù)據(jù)的相關(guān)系數(shù)對梁間橫向聯(lián)系進行分析,并將主成分分析應(yīng)用于撓度計算值與實測值偏差的分析,給出了通過統(tǒng)計學(xué)的思想分析數(shù)據(jù)的步驟與物理意義,通過兩種手段的結(jié)合,獲取橋梁結(jié)構(gòu)中的相關(guān)參數(shù),并分析該橋的實際工作狀態(tài)。有限元模型修正的目的是對參數(shù)進行識別與修正,修正后的模型可以更好地代表實橋模型,參數(shù)識別的結(jié)果可以為橋梁損傷部位的判別以及后續(xù)的修復(fù)工作給出指導(dǎo)。
[Abstract]:Bridge is an important structure in road traffic network, and it is also the key to the early opening of each line. Therefore, it is necessary to ensure the safe operation of the bridge in its design service life. Fabricated concrete beam bridges are widely used in practical projects. However, with the passage of time, due to the influence of various external environmental factors, the structural performance of fabricated concrete girder bridges is bound to decline in varying degrees, so we must understand its working state. In order to make timely response measures. Load test is the most common means used by engineers. Through the results of load test, the working state of the bridge can be evaluated, and the safe bearing capacity and operation quality of the bridge can also be judged. In this paper, a static parameter identification algorithm based on displacement error is proposed. The finite element model of the real bridge is established based on the load test of the real bridge, and the displacement error vector between the measured deflection data and the calculated value of the model is constructed. Based on the observation degree of freedom, the static equilibrium equation is deduced, and the iterative equation is constructed. Through the gradual reduction of the displacement error, the correction of the element stiffness is obtained and the real bridge model is modified. At the same time, when determining the damage element and the most needed parameters, this paper proposes a method of selecting the unit to be identified based on the theory of multivariate statistical analysis. The correlation coefficient of calculating the measured data of deflection of each beam is used to analyze the transverse relation between the beams, and the principal component analysis is applied to the analysis of the deviation between the calculated and measured values of deflection. The steps and physical significance of analyzing the data through the thought of statistics are given. Through the combination of the two methods, the relevant parameters of the bridge structure are obtained, and the actual working state of the bridge is analyzed. The purpose of the finite element model modification is to identify and modify the parameters. The modified model can better represent the real bridge model. The result of the parameter identification can provide guidance for the identification of the damaged site of the bridge and the subsequent repair work.
【學(xué)位授予單位】：哈爾濱工業(yè)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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本文編號：2368202