本文關(guān)鍵詞：基于層次分析法研究橋梁健康狀況的智能評(píng)估系統(tǒng)開發(fā)　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 懸索橋 層次分析法 評(píng)估體系 評(píng)估軟件

【摘要】：現(xiàn)代懸索橋自初次建立起便具有跨度大，跨越能力強(qiáng)的優(yōu)點(diǎn)，隨著橋梁建設(shè)水平的不斷提高，跨度也不斷增大，而且結(jié)構(gòu)形式也日趨復(fù)雜，橋梁健康監(jiān)測(cè)系統(tǒng)的建立也顯得尤為必要。另外，人們對(duì)大跨橋梁的安全性、耐久性和正常使用功能也越來越關(guān)注，這就使得橋梁結(jié)構(gòu)的健康狀況評(píng)估的研究和應(yīng)用成為行業(yè)里非常活躍的研究方向。 青草背長(zhǎng)江大橋位于重慶三環(huán)高速公路涪陵李渡至南川雙河口段，該路段交通流量大，橋梁負(fù)擔(dān)大，因此橋梁強(qiáng)度和剛度會(huì)隨時(shí)間增加而降低，這將會(huì)影響安全行車，也會(huì)縮短橋梁使用壽命。因此，對(duì)青草背長(zhǎng)江大橋健康狀況的評(píng)估能為橋梁的壽命產(chǎn)生積極的作用。 本文以青草背長(zhǎng)江大橋?yàn)楣こ瘫尘�，采用利用傳感器�?shí)測(cè)數(shù)據(jù)對(duì)其建立評(píng)估系統(tǒng)，并由此得出該橋技術(shù)狀況評(píng)估軟件。本文的研究工作主要內(nèi)容如下： 首先，采用有限元軟件Midas civil2010建立全橋模型，對(duì)橋梁結(jié)構(gòu)進(jìn)行靜力分析，定義四種荷載組合，查詢主梁、橋塔、主纜、吊桿在荷載組合作用下的應(yīng)力及位移，計(jì)算出各構(gòu)件的應(yīng)力閥值、位移閥值和索力閥值； 其次，擬定橋梁健康監(jiān)測(cè)系統(tǒng)的實(shí)施方案，確定需要布設(shè)傳感器的關(guān)鍵部位，進(jìn)行橋梁的實(shí)時(shí)在線監(jiān)測(cè)，并返回實(shí)測(cè)數(shù)據(jù)，將實(shí)測(cè)數(shù)據(jù)進(jìn)行統(tǒng)計(jì)與分析； 再次，基于層次分析法的理論將評(píng)估系統(tǒng)劃分層次，再通過專家問卷調(diào)查的方式獲取各層指標(biāo)的權(quán)重，，再將理論值與實(shí)測(cè)值進(jìn)行比較，引入模糊理論，對(duì)各個(gè)構(gòu)件進(jìn)行評(píng)分，將所得評(píng)分與權(quán)重的乘積逐層累加，最后獲得完整的具有分值的評(píng)估系統(tǒng)； 最后，將所得評(píng)估系統(tǒng)中的各項(xiàng)數(shù)據(jù)作為技術(shù)支持，投入到橋梁健康狀況智能評(píng)估系統(tǒng)的開發(fā)中，并最終開發(fā)出評(píng)估軟件。將之前步驟中所得數(shù)據(jù)及評(píng)估系統(tǒng)作為技術(shù)支持，投入到該橋技術(shù)狀況評(píng)估軟件的開發(fā)中，并最終開發(fā)出評(píng)估軟件，從而實(shí)現(xiàn)該橋在線狀態(tài)下的狀態(tài)評(píng)估。
[Abstract]:Modern suspension bridge has the advantages of long span and strong span since it was first built. With the continuous improvement of the bridge construction level, the span is also increasing, and the structure form is becoming more and more complex. In addition, people pay more and more attention to the safety, durability and normal function of long-span bridges. This makes the research and application of bridge structure health assessment become a very active research direction in the industry. Qingcaobei Yangtze River Bridge is located in the section between Fuling and Shuanghekou of Chongqing third Ring Road Expressway. This section has a large traffic flow and a large bridge burden, so the strength and stiffness of the bridge will decrease with the increase of time. This will affect the safe driving and shorten the service life of the bridge. Therefore, the assessment of the health condition of the Qingcaobei Yangtze River Bridge can play a positive role in the bridge's life. In this paper, the Qingcaobei Yangtze River Bridge is taken as the engineering background, and the evaluation system is established by using the measured data of the sensor, and the evaluation software of the bridge's technical condition is obtained. The main contents of this paper are as follows: Firstly, the finite element software Midas civil2010 is used to establish the full bridge model, to analyze the static force of the bridge structure, to define four kinds of load combinations, to query the main beam, the bridge tower and the main cable. The stress and displacement of the suspender under the combined load are calculated, and the stress threshold, displacement threshold and cable force threshold of each member are calculated. Secondly, the implementation scheme of the bridge health monitoring system is drawn up, the key parts of the bridge health monitoring system are determined, the real-time on-line monitoring of the bridge is carried out, and the measured data are returned, and the measured data are counted and analyzed. Thirdly, based on the theory of analytic hierarchy process, the evaluation system is divided into different levels, and then the weight of each layer index is obtained by expert questionnaire, and then the theoretical value is compared with the measured value, and the fuzzy theory is introduced. Each component is graded, the product of the score and weight is accumulated layer by layer, and finally a complete evaluation system with score is obtained. Finally, the data of the evaluation system is used as the technical support to develop the intelligent evaluation system of bridge health condition. Finally, the evaluation software is developed. The data and the evaluation system are used as the technical support, and the evaluation software is developed. In order to achieve the bridge online state evaluation.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.7

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