發(fā)布時間：2018-02-16 00:16

  本文關鍵詞： 鋼管混凝土拱橋 評估方法 評估系統(tǒng) 權重 評語　出處：《長安大學》2014年碩士論文　論文類型：學位論文

【摘要】：鋼管混凝土拱橋近些年來在我國交通領域發(fā)展受到了越來越多橋梁設計師的青睞。這不僅僅是因為它的造型優(yōu)美，還有諸多其它方面的優(yōu)點，目前它在交通領域占據(jù)了重要地位。鋼管混凝土拱橋伴隨運營時間的增長，橋梁自身構件或多或少的出現(xiàn)了病害，這些病害如果不能及時發(fā)現(xiàn)，病害繼而擴展就有可能引起重大的工程事故。目前，國外很多的大型橋梁都建立了比較完善的健康監(jiān)測系統(tǒng)，而在國內(nèi)交通行業(yè)大發(fā)展的背景下，行業(yè)人員也很重視橋梁的健康檢測，并且越來越多的實踐到了一些大型橋梁上。這種系統(tǒng)能夠比較及時、有效的發(fā)現(xiàn)橋梁結構的病害，并且針對損害狀況迅速的做出相應處治措施。本文將以一座大跨徑鋼管混凝土拱橋為依托工程，研究分析了鋼管混凝土拱橋健康監(jiān)測方面的幾個問題。主要的研究工作及成果包括如下幾個方面： （1）鋼管混凝土拱橋基于綜合評估法的安全跟蹤評估方法。從鋼管混凝土拱橋運營狀態(tài)健康監(jiān)測的內(nèi)容，常見的評估方法，以及橋梁自身結構受力特點，優(yōu)選出基于綜合評估法的安全跟蹤評估方法合適的健康監(jiān)測方案，著重介紹了層次分析法和變權原理； （2）鋼管混凝土拱橋安全跟蹤評估系統(tǒng)的建立。從評估系統(tǒng)系統(tǒng)設計準則出發(fā)，選出鋼管混凝土拱橋的評估項目，完成評估測點的布設，簡述評估數(shù)據(jù)的采集，以及評估的準則。 （3）以滹沱河特大橋工程實例建立安全跟蹤評估系統(tǒng)。從橋梁結構的幾何形態(tài)布設，橋梁結構應力測試截面及測點布設，拱座和主墩、系梁應變計的埋設及布置，主、邊拱肋和橫撐應變計的埋設及布置，外包段、立柱和縱橫梁應變計的埋設及布置，以及吊桿應力狀態(tài)監(jiān)測等方面詳細介紹監(jiān)測系統(tǒng)的建立要點，以及后期的數(shù)據(jù)采集。具體的示范了安全跟蹤評估系統(tǒng)的建立。 （4）滹沱河特大橋安全評估計算分析。在滹沱河特大橋安全跟蹤評估中，經(jīng)過結構層次體系的劃分及建立、并確定各個層次的初始權重，，以及監(jiān)測測點權重值的計算；又從大橋的應力指標評語、拱體系截面測點評語、吊桿索力評語、結構幾何形態(tài)參數(shù)指標評語四方面進行指標層評語的確定后。進行變權綜合法評估計算，得出滹沱河特大橋結構等級為一類的結論。
[Abstract]:In recent years, concrete-filled steel tubular arch bridges have attracted more and more attention from bridge designers in the field of transportation in China. This is not only because of its beautiful shape, but also because of its many other advantages. At present, it occupies an important position in the field of transportation. With the increase of operation time of CFST arch bridge, there are more or less defects of its own components, if these diseases can not be found in time, At present, many large bridges in foreign countries have established relatively perfect health monitoring systems, and in the context of the great development of the domestic transportation industry, Industry personnel also attach great importance to bridge health detection, and more and more practice on some large bridges. This system can be relatively timely, effective detection of bridge structure diseases, And to deal with the damage quickly, this paper will rely on a long-span concrete-filled steel tube arch bridge. Several problems in health monitoring of concrete-filled steel tubular arch bridge are studied and analyzed. The main research work and results include the following aspects:. 1) the safety tracking evaluation method of CFST arch bridge based on comprehensive evaluation method. The contents of health monitoring of CFST arch bridge, the common evaluation methods, and the structural characteristics of the bridge are discussed. The suitable health monitoring scheme based on comprehensive assessment method is selected, and the analytic hierarchy process (AHP) and the principle of variable weight are emphatically introduced. Based on the design criteria of the evaluation system, the evaluation project of the concrete filled steel tubular arch bridge is selected, and the layout of the evaluation measuring points is completed. The collection of the evaluation data and the evaluation criteria are briefly described. The safety tracking and evaluation system is established with the example of Hutuo River Bridge Project. From the geometric configuration of the bridge structure, the layout of the stress test section and measuring points of the bridge structure, the embedding and arrangement of the arch seat and the main pier, the strain gauge of the tie beam, the main, The installation and arrangement of the side arch rib and transverse bracing strain gauge, the outlay section, the embedding and arrangement of the vertical and horizontal beam strain gauge, and the monitoring of the stress state of the suspender are introduced in detail, and the main points of establishing the monitoring system are introduced in detail. And later data acquisition. The concrete demonstration of the establishment of a security tracking and evaluation system. 4) calculation and analysis of safety assessment of Hutuo River Bridge. In the safety tracking evaluation of Hutuo River Bridge, the structure hierarchy system is divided and established, the initial weight of each level is determined, and the weight value of monitoring point is calculated. After the evaluation of the stress index of the bridge, the evaluation of the section of the arch system, the evaluation of the cable force of the hoisting rod and the evaluation of the index of the geometric and morphological parameters of the structure, the evaluation calculation of the index layer is carried out by using the variable weight synthesis method. It is concluded that the structure grade of Hutuo River Bridge is one class.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U447

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