本文關(guān)鍵詞： 鋼筋混凝土箱型拱橋 拱軸線偏差 內(nèi)力 穩(wěn)定性 處治方法　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：對(duì)于大跨度鋼筋混凝土箱型拱橋，隨著跨徑的增大，結(jié)構(gòu)的整體剛度降低，主拱圈拱軸線微小的偏差和強(qiáng)大的拱軸力相互作用，可產(chǎn)生較大的彎矩，線形偏差過大甚至?xí)蔀榻Y(jié)構(gòu)破壞的主要誘導(dǎo)因素。而拱軸線偏差在拱橋設(shè)計(jì)、制造、施工階段和營(yíng)運(yùn)過程中是難以避免的，為了確保橋梁的安全施工、運(yùn)營(yíng)和維護(hù)，必須著力研究拱軸線偏差對(duì)拱橋結(jié)構(gòu)行為的影響及其處治方案等問題。 ○1分析了拱軸線偏差對(duì)懸鏈線拱橋拱腳水平推力的影響，接著對(duì)拱軸線偏差對(duì)拱橋內(nèi)力和穩(wěn)定性的影響進(jìn)行了理論分析,并推導(dǎo)了實(shí)橋恒載壓力線的計(jì)算方法，分別分析了正對(duì)稱偏差和反對(duì)稱偏差狀況下對(duì)拱橋內(nèi)力的影響，并對(duì)其進(jìn)行比較。對(duì)平面內(nèi)和平面外的偏差對(duì)穩(wěn)定性的影響進(jìn)行了分析，比較了兩者對(duì)結(jié)構(gòu)穩(wěn)定性影響的程度。分析了國(guó)內(nèi)外拱橋拱軸線形偏差控制方法的研究現(xiàn)狀，《對(duì)公路工程質(zhì)量評(píng)定標(biāo)準(zhǔn)》(JTGF801 2004)關(guān)于施工中拱軸線形偏差容許值的規(guī)定做了相應(yīng)的理論分析，并對(duì)《評(píng)定標(biāo)準(zhǔn)》“8-8-3拱的安裝”中對(duì)拱軸線形偏差限值相應(yīng)的規(guī)定是否適用于大跨徑拱橋線形偏差控制進(jìn)行了探討。 ○2以施工過程中存在較大拱軸線偏差的某橋?yàn)楣こ桃劳�，運(yùn)用有限元軟件對(duì)某橋設(shè)計(jì)狀態(tài)和拱軸線偏差狀態(tài)分別建立模型進(jìn)行模擬計(jì)算，對(duì)比原設(shè)計(jì)狀態(tài)下和偏差狀態(tài)下結(jié)構(gòu)行為，客觀評(píng)估實(shí)測(cè)拱軸線偏差對(duì)橋梁內(nèi)力和穩(wěn)定性影響，為處治方案提供依據(jù)。 ○3針對(duì)某橋偏差現(xiàn)狀，通過技術(shù)經(jīng)濟(jì)比較進(jìn)行方案選擇，，提出了鋼筋混凝土套箍環(huán)狀封閉拱箱接縫、套箍環(huán)狀封閉拱腳、調(diào)整拱頂現(xiàn)澆層厚度的處治對(duì)策。對(duì)處治后進(jìn)行了施工階段分析，確保施工過程的安全。為同類型橋梁的處治對(duì)策提供參考。
[Abstract]:For the long-span reinforced concrete box arch bridge, with the increase of span, the overall stiffness of the structure decreases, the minor deviation of the arch axis of the main arch ring and the strong interaction of the arch axial force can result in greater bending moment. The deviation of the arch axis is unavoidable in the design, manufacture, construction and operation of the arch bridge, in order to ensure the safe construction, operation and maintenance of the bridge, It is necessary to study the influence of arch axis deviation on the structure behavior of arch bridge and its treatment scheme. The influence of arch axis deviation on the horizontal thrust of arch foot of catenary arch bridge is analyzed, and the influence of arch axis deviation on the internal force and stability of arch bridge is analyzed theoretically, and the calculation method of dead load pressure line of real bridge is deduced. The influence of normal symmetry deviation and antisymmetric deviation on the internal force of arch bridge is analyzed and compared. The influence of the deviation in plane and out of plane on the stability of arch bridge is analyzed. This paper compares the influence of the two methods on the stability of the structure, analyzes the present situation of the research on the control methods of the arch axis deviation at home and abroad, and gives a specification on the allowable value of the arch axis line deviation in the construction of JTGF801 / 2004. The corresponding theoretical analysis has been made. This paper also discusses whether the corresponding limit value of arch axis deviation in "8-8-3 Arch installation" is applicable to the control of alignment deviation of long-span arch bridge. 02 based on a bridge with large arch axis deviation in the construction process, the finite element software is used to simulate and calculate the design state and the arch axis deviation state of a certain bridge, respectively. Compared with the structural behavior under the original design state and the deviation state, the influence of the measured arch axis deviation on the internal force and stability of the bridge is evaluated objectively, which provides the basis for the treatment scheme. In view of the current situation of the deviation of a certain bridge, through the technical and economic comparison, the scheme is selected, and the reinforced concrete hoop annular closed arch box joint and the hoop annular closed arch foot are put forward. The treatment measures for adjusting the thickness of the cast-in-place layer of the arch roof are analyzed in the construction stage after treatment to ensure the safety of the construction process and to provide a reference for the treatment countermeasures of the same type of bridges.
【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)】：U448.22

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