【摘要】：在外在自然環(huán)境、荷載作用的綜合影響下，橋梁的重要承重構(gòu)件的承載能力會(huì)隨著時(shí)間出現(xiàn)不同程度的衰減，影響橋梁的使用壽命。為了掌握橋梁的健康狀況，針對(duì)大跨徑橋梁，常采用長(zhǎng)期健康監(jiān)測(cè)系統(tǒng)，對(duì)橋梁進(jìn)行實(shí)時(shí)監(jiān)控。而隨著監(jiān)測(cè)數(shù)據(jù)的逐年累積，如何通過(guò)采集到的數(shù)據(jù)挖掘有用信息，進(jìn)而應(yīng)用到實(shí)際的橋梁設(shè)計(jì)、維護(hù)和狀態(tài)評(píng)估當(dāng)中去，成為了一個(gè)值得探討研究的問(wèn)題。 本文采用數(shù)值計(jì)算方法對(duì)橋梁健康監(jiān)測(cè)的數(shù)據(jù)進(jìn)行分析，在大量數(shù)據(jù)累積的基礎(chǔ)上，分析數(shù)據(jù)包含的深層信息。本文主要內(nèi)容包括： （1）介紹了背景橋梁的工程概況以及針對(duì)該橋所設(shè)置的健康監(jiān)測(cè)系統(tǒng)的主要布置形式。統(tǒng)計(jì)了實(shí)測(cè)得到的不同截面上溫度以及應(yīng)變數(shù)據(jù)的變化規(guī)律，采用統(tǒng)計(jì)學(xué)的相關(guān)方法，對(duì)實(shí)測(cè)應(yīng)變數(shù)據(jù)進(jìn)行相應(yīng)的預(yù)處理。結(jié)合混凝土橋?qū)崪y(cè)數(shù)據(jù)進(jìn)行比對(duì)分析發(fā)現(xiàn)，混凝土橋內(nèi)部的溫度差要明顯高于鋼橋內(nèi)部溫度差。 （2）通過(guò)傅立葉變換的計(jì)算方法，得出了鋼箱梁橋?qū)崪y(cè)溫度數(shù)據(jù)與應(yīng)變數(shù)據(jù)中包含兩個(gè)相同的主要頻率組成：12小時(shí)和24小時(shí)。和混凝土橋梁相同。提取不同頻率對(duì)應(yīng)的幅值，探討了橋梁的縱橋向上截面同一部位變化特點(diǎn)。 （3）通過(guò)小波分析，有效的濾除實(shí)測(cè)溫度中所包含的噪聲成分，并驗(yàn)證了和溫度相同頻率的應(yīng)變組份是由日溫度變化引起的。探討了鋼箱梁與混凝土箱梁截面溫度場(chǎng)引起的溫度應(yīng)力在橋梁監(jiān)測(cè)應(yīng)力中所占的比重，混凝土橋截面不同位置的溫度效應(yīng)有很大差異，，但引起的溫度應(yīng)變占總應(yīng)變很小一部分，而鋼箱梁橋截面溫度效應(yīng)整體較為均衡，溫度應(yīng)變占總應(yīng)變很大一部分成分，日溫度效應(yīng)引起的應(yīng)變占整體的50%以上。 （4）將實(shí)時(shí)應(yīng)力數(shù)據(jù)引入可靠性評(píng)估，選取實(shí)測(cè)混凝土橋，采用一次二階矩法以及Monte-Carlo法進(jìn)行可靠度指標(biāo)的計(jì)算。并通過(guò)對(duì)比計(jì)算結(jié)果，討論一次二階矩法對(duì)于實(shí)測(cè)數(shù)據(jù)可靠度計(jì)算的適用性以及精確性問(wèn)題。
[Abstract]:Under the combined influence of external natural environment and load, the bearing capacity of the important load-bearing members of the bridge will decay with time, which will affect the service life of the bridge. In order to grasp the health status of bridges, a long term health monitoring system is often used for long span bridges. With the accumulation of monitoring data year by year, how to mine useful information through the collected data, and then apply it to the actual bridge design, maintenance and state evaluation, has become a problem worth studying. In this paper, the data of bridge health monitoring are analyzed by numerical method, and the deep information contained in the data is analyzed on the basis of a large amount of data accumulation. The main contents of this paper are as follows: (1) the engineering situation of the background bridge and the main layout of the health monitoring system for the bridge are introduced. The variation law of temperature and strain data on different cross-sections was calculated and the corresponding pretreatment of the measured strain data was carried out by using the statistical correlation method. By comparing and analyzing the measured data of concrete bridge, it is found that the temperature difference in concrete bridge is obviously higher than that in steel bridge. (2) the method of Fourier transform is used to calculate the temperature difference of concrete bridge. It is obtained that the measured temperature data and strain data of the steel box girder bridge contain two main frequencies which consist of two main frequencies: 12 hours and 24 hours. It's the same as a concrete bridge. The amplitudes corresponding to different frequencies are extracted, and the variation characteristics of the same part of the longitudinal section of the bridge are discussed. (3) the noise components contained in the measured temperature are effectively filtered by wavelet analysis. It is verified that the strain components of the same frequency as temperature are caused by the daily temperature variation. The proportion of temperature stress in bridge monitoring stress caused by temperature field of steel box girder and concrete box girder section is discussed. The temperature effect of different position of concrete bridge section is very different, but the temperature strain caused by the temperature strain is a small part of the total strain. However, the cross-section temperature effect of steel box girder bridge is relatively balanced, the temperature strain accounts for a large part of the total strain, and the strain caused by the daily temperature effect accounts for more than 50% of the total strain. (4) the real-time stress data are introduced into the reliability evaluation. The first order second moment method and Monte-Carlo method are used to calculate the reliability index of concrete bridge. The applicability and accuracy of the first-order second-moment method for calculating the reliability of measured data are discussed by comparing the calculation results.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U446

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