本文選題：吊桿更換　切入點：有限元分析　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：自上世紀(jì)九十年代起吊桿拱橋開始在我國迅猛發(fā)展,但限于當(dāng)時的技術(shù)水平以及后期使用上的不當(dāng),近年來不斷的有吊桿因為銹蝕、疲勞等原因出現(xiàn)破損。為了確保拱橋吊桿的正常使用,對這些舊橋的吊桿更換工作已勢在必行。但吊桿更換工程是一個復(fù)雜的整體工程,技術(shù)難度較大,到目前為止工程界對吊桿更換的研究還處于一個初級階段,沒有形成一套成熟完整的吊桿更換施工工藝。鑒于此,為了確保吊桿更換過程的安全,很有必要對吊桿更換進(jìn)行進(jìn)一步的研究。 本文首先介紹了吊桿拱橋的類型、受力特點,總結(jié)了拱橋吊桿的工程現(xiàn)狀及破損、更換情況,緊接著以楠溪江三橋吊桿更換工程為背景,針對當(dāng)前吊桿更換過程當(dāng)中存在的一些關(guān)鍵問題進(jìn)行了研究,總結(jié)歸納了以下幾方面的內(nèi)容： 1)基于有限元軟件MIDAS,提出了一種橋面有效剛度的模擬方法,解決了如何準(zhǔn)確地計算橋面支撐法更換過程中各階段的橋面變形和吊桿力的變化問題,研究了不同的施工步長對橋面的變形、轉(zhuǎn)角以及吊桿力的影響。 2)分析了不同吊桿更換施工方法對橋面變形的影響,提出了采用轉(zhuǎn)角影響矩陣并結(jié)合橋梁設(shè)計荷載來計算更換過程中橋面最大允許轉(zhuǎn)角的方法,針對短吊桿還提出了一種簡易的監(jiān)控方法。 3)基于有限元軟件MIDAS研究了減震器的剛度和安裝位置對吊桿頻率、吊桿有效長度的影響,并通過數(shù)值擬合得到了通過修改吊桿的有效長度來考慮減震器影響的吊桿力計算公式。 4)以楠溪江三橋更換施工中吊桿力的實測數(shù)據(jù)為依據(jù),得到了吊桿兩端剛度變化段對吊桿有效長度的影響,研究結(jié)果表明對于同一類型的吊桿,剛度變化段對吊桿有效長度的影響為一定值。 5)總結(jié)了楠溪江三橋吊桿更換的施工監(jiān)控過程,為同類型的吊桿更換施工提供了經(jīng)驗。
[Abstract]:The arch bridge to start the rapid development in our country since the last century in 90s, but was limited to the technical level and the use of improper, in recent years the boom because of corrosion, fatigue and other causes of damage. In order to ensure the normal use of the arch bridge, old bridge suspender replacement work is imperative. But the suspender replacement the project is a complex system engineering, technical difficulty, so far the engineering research on suspender replacement is still in the primary stage, have not formed a mature and complete construction process of replacing suspender. In view of this, in order to ensure the safety of suspender replacement process, it is necessary for the suspender replacement for further study.
This paper first introduces the types of suspenders of arch bridge, the stress characteristic, summarizes the engineering status of arch bridge suspender and damaged, replacement, followed by Nanxi River bridge suspender replacement project, aiming at some key problems existing among the current process of suspender replacement were studied and summarized as follows:
1) based on the finite element software MIDAS, presents a simulation method for effective deck stiffness, solves the problem of how to accurately calculate the deformation of the bridge deck and deck support method replacing Suspender Force during various stages of change, different steps of the construction deformation of bridge deck was studied, and the influence of angle of Suspender Force.
2) the influence of different suspender replacement methods on bridge deck deformation is analyzed. A method of calculating the maximum allowable rotation angle of bridge deck during the replacement process is put forward based on the angle influence matrix combined with the bridge design load, and a simple monitoring method for short suspender is also proposed.
3) based on the finite element software MIDAS, we studied the influence of the stiffness and installation position of the shock absorber on the boom frequency and the effective length of the boom, and by numerical fitting, we got the calculation formula of the hanger force by modifying the effective length of the boom to take into account the influence of the shock absorber.
4) measured data of Nanxi River bridge in the construction of replacing Suspender Force as the basis, the effect of changing the hangers stiffness on the effective length of the boom, the results show that for the same type of boom, the effect of stiffness change section of the effective length of suspenders is a certain value.
5) summarizes the construction monitoring of Nanxi River bridge suspender replacement, provide the experience for the same type of suspender replacement construction.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.22

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本文編號：1591252