本文關(guān)鍵詞：現(xiàn)澆上承式鋼筋混凝土箱形拱橋拱圈與鋼拱架的聯(lián)合作用研究　出處：《重慶交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 聯(lián)合作用 分環(huán)澆筑 箱形拱橋 拱架施工

【摘要】：由于鋼筋混凝土拱橋具有跨越能力大、應(yīng)力分布均勻、整體穩(wěn)定性較好等特點(diǎn),在我們西部山區(qū)等地方得到普遍推廣,主跨跨徑多為100-150m。從施工角度看,山區(qū)的交通不發(fā)達(dá),大型起吊設(shè)備進(jìn)出場(chǎng)費(fèi)用過(guò)高或進(jìn)場(chǎng)困難,采用纜索吊裝施工有一定的難度,所以拱架現(xiàn)澆施工成為一個(gè)較好的施工手段。拱架具有跨越能力大、組裝便捷、材料可以多次循環(huán)使用且不受洪水等影響,施工期間可以滿足正常的通航要求,所以特別適合山區(qū)拱橋的施工使用。在以往的拱架設(shè)計(jì)中,拱架承擔(dān)70%以上的拱圈重量,這將會(huì)令臨時(shí)設(shè)施費(fèi)增加、拱架用量增加,從而增加了施工成本和拼裝難度。本文以正舟大橋擴(kuò)建工程為依托,對(duì)拱架和拱圈的聯(lián)合作用情況進(jìn)行了研究,通過(guò)空間模型對(duì)施工過(guò)程模擬并與現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)進(jìn)行比較,作者發(fā)現(xiàn)當(dāng)采用合理分環(huán)方案時(shí),先期澆筑的混凝土拱圈可以承受自重的40%以上,這將大大減少拱架數(shù)量,節(jié)約成本。所以,對(duì)采用拱架施工的鋼筋混凝土箱形拱橋的受力分析、施工工藝優(yōu)化以及箱形拱橋的未來(lái)建設(shè)具有重大應(yīng)用價(jià)值。本文將在正舟大橋擴(kuò)建工程的基礎(chǔ)上,開展以下研究工作:①用大型有限元軟件MIDAS/Civil建立符合拱圈現(xiàn)澆施工過(guò)程的結(jié)構(gòu)仿真計(jì)算模型,結(jié)合正舟大橋?qū)崪y(cè)數(shù)據(jù),研究先期澆筑形成的拱環(huán)與拱架的聯(lián)合作用,并計(jì)算出拱圈與拱架聯(lián)合作用對(duì)整體的貢獻(xiàn)度;②以工程實(shí)例為基礎(chǔ),調(diào)整拱圈分環(huán)方案,對(duì)比不同施工工藝對(duì)拱圈、拱架荷載分配比例的影響;③在保證施工過(guò)程中拱架應(yīng)力在設(shè)計(jì)允許范圍內(nèi)的情況下,通過(guò)合理的分環(huán)方案,分析研究拱架與拱圈間聯(lián)合作用隨拱架、拱圈的寬度變化規(guī)律并擬合出線性方程;④利用變形反映剛度原理,提出用來(lái)估算拱架、拱圈聯(lián)合作用的荷載分配比例計(jì)算公式。本文的研究?jī)?nèi)容為正舟大橋擴(kuò)建工程的施工建設(shè)提供了安全、可靠的施工方案。同時(shí),利用依托工程對(duì)拱架、拱圈的聯(lián)合作用進(jìn)行了擴(kuò)展研究,為今后利用拱架施工的拱橋建設(shè)提供了參考依據(jù),具有一定的借鑒意義。
[Abstract]:As reinforced concrete arch bridge has the characteristics of large span capacity, uniform stress distribution, good overall stability, and so on, it has been widely used in mountain areas in the western part of our country. The span of main span is mostly 100-150m.From the point of view of construction, the traffic in mountainous area is not developed, the entrance and exit cost of large lifting equipment is too high or it is difficult to enter the field, it is difficult to adopt cable hoisting construction. Therefore, the construction of arch frame cast-in-place has become a better construction means. The arch frame has a large span capacity, convenient assembly, materials can be recycled many times and can not be affected by floods, and can meet the normal navigation requirements during construction. Therefore, it is especially suitable for the construction of mountain arch bridge. In the past arch frame design, the arch frame bears more than 70% arch ring weight, which will increase the temporary facility cost and increase the use of arch frame. Therefore, the construction cost and assembly difficulty are increased. Based on the expansion project of Zhengzhou Bridge, the combined action of arch frame and arch ring is studied in this paper. Through the space model to simulate the construction process and compare with the field measured data, the author found that the concrete arch ring can bear more than 40% of the self-weight when the reasonable ring dividing scheme is adopted. This will greatly reduce the number of arch frames and save cost. Therefore, the stress analysis of reinforced concrete box arch bridge constructed by arch frame is given. The optimization of construction technology and the future construction of box-shaped arch bridge are of great application value. This paper will be based on the expansion project of Zhengzhou Bridge. The following research work has been carried out: 1. The structure simulation calculation model which accords with the construction process of arch ring cast-in-place is established by using the large-scale finite element software MIDAS/Civil, and combined with the measured data of Zhengzhou Bridge. The joint action of arch ring and arch frame formed by pre-pouring is studied, and the contribution of arch ring and arch frame to the whole is calculated. 2 on the basis of engineering example, adjusting the scheme of ring division of arch ring and comparing the effect of different construction technology on the distribution of load between arch ring and arch frame; (3) under the condition that the stress of arch frame is within the allowable range of design during the construction process, the combined action of arch frame and arch ring with arch frame is analyzed and studied through reasonable ring splitting scheme. The variation law of arch ring width and the linear equation are fitted. (4) based on the principle of deformation reflecting stiffness, a formula for calculating the proportion of load distribution used to estimate the joint action of arch frame and arch ring is put forward. The research content of this paper provides safety for the construction and construction of Zhengzhou Bridge expansion project. At the same time, the research on the joint action of arch frame and arch ring by relying engineering is carried out, which provides a reference basis for the construction of arch bridge using arch frame construction in the future, and has certain reference significance.
【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】：2015
【分類號(hào)】：U445.57

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本文編號(hào)：1388164