發(fā)布時間：2019-02-20 07:45

【摘要】：近年來,伴隨著交通事業(yè)的大力建設,橋梁作為工程建設中的重要環(huán)節(jié),其研究工作非常艱巨。目前,國內(nèi)外的橋梁其結(jié)構(gòu)趨近于大跨度,形式多樣化的特點。提籃拱橋,結(jié)構(gòu)比較美觀,受力相對特殊,所以能獲得設計人員的關注。但因其結(jié)構(gòu)構(gòu)造形式復雜,導致在實際工程建設中頗具困難。所以,對施工完成后的橋梁狀態(tài),若想結(jié)構(gòu)狀態(tài)達到設計目標,進行施工過程得控制就顯得非常重要。本文,以在建工程…普灣拱橋為研究背景,通過Midas有限元程序?qū)Y(jié)構(gòu)的整個建造過程進行了仿真模擬計算,模擬分析了建設過程中不可避免的重要問題,基本工作如下所述：(一)介紹了系桿拱橋及施工控制研究現(xiàn)狀及趨勢,并對目前工程中常用的拱橋施工方法做了簡要介紹,闡述了各種方法的施工工序,并概括了各自的施工關鍵點。(二)對現(xiàn)代橋梁施工控制內(nèi)容和方法進行了簡要介紹,并對施工控制的目的和方法,以及對影響施工控制的因素和解決辦法進行了具體闡述。(三)對于該橋采用懸臂拼裝技術進行中跨拱肋的施工,介紹了拼裝過程中需要注意的事項。對比介紹了目前計算扣索力的幾種常用方法,詳細闡述了彈性-剛性支撐法、有限元法計算理論。本文通過有限元分析方法及彈性-剛性支撐法,對本橋斜拉扣索進行了計算,制定了兩種扣索張拉方案,結(jié)果都能使整個拱肋安裝過程中結(jié)構(gòu)應力及控制點位移滿足要求,逼近于中拱肋一次落架線形。通過方案比選供施工單位根據(jù)現(xiàn)場施工條件進行選擇。(四)主要對背景工程進行了吊桿力控制。通過差值迭代法計算吊桿張拉控制力,并對比分析了中跨吊桿在擬定的三種張拉方案下,其吊桿拉力、主梁和拱肋的應力變化,綜合比較施工的方便性,從而對中跨吊桿選出相對較好的張拉方案。(五)通過正裝法,利用Midas有限元程序進行仿真模擬分析。對整個施工過程中關鍵階段的拱肋、主梁關鍵截面應力及控制點位移進行控制,并通過系桿的張拉控制,使樁基頂部水平位移在控制范圍內(nèi)。結(jié)果表明,在施工全過程中,結(jié)構(gòu)受力及變形狀態(tài)均能滿足設計要求。
[Abstract]:In recent years, with the construction of transportation, bridge as an important link in engineering construction, its research work is very arduous. At present, the structure of bridges at home and abroad approaches to long span and diversified forms. Basket arch bridge, the structure is more beautiful, the force is relatively special, so can get the attention of designers. However, because of its complex structural form, it is difficult in practical engineering construction. Therefore, it is very important to control the construction process if the structure state is to reach the design goal. In this paper, the construction in progress. Based on the research background of Puwan arch bridge, the whole construction process of the structure is simulated and calculated by Midas finite element program, and the unavoidable important problems in the construction process are simulated and analyzed. The basic work is as follows: (1) the present situation and trend of the research on tied arch bridge and its construction control are introduced, and the common construction methods of arch bridge are briefly introduced, and the construction procedures of various methods are expounded. The key points of construction are summarized. (2) the contents and methods of modern bridge construction control are briefly introduced, and the purpose and method of construction control, as well as the factors affecting construction control and the solutions are expounded in detail. (3) the construction of middle span arch rib with cantilever assembly technology is introduced. Several commonly used methods for calculating buckling force are compared and introduced in this paper. The elastic-rigid bracing method and finite element method are described in detail. In this paper, by means of finite element analysis and elastic-rigid bracing method, the cable-stayed cables of the bridge are calculated and two kinds of tensioning schemes are formulated. The results show that the stress of the structure and the displacement of the control point can meet the requirements during the installation of the arch rib. Approaching to the middle arch rib once fall frame line. According to the site construction conditions, the construction units are selected through the scheme comparison. (4) the control of the suspender force is mainly carried out in the background engineering. The tension control force of the suspender is calculated by the difference iterative method, and the tension force of the suspender, the stress change of the main beam and the arch rib under the three kinds of tension schemes of the mid-span suspender are compared, and the convenience of construction is compared synthetically. Thus, a relatively good tension scheme is selected for the mid-span suspenders. (5) Midas finite element program is used to simulate and analyze by formal dress method. The stress of the key section and the displacement of the control point of the main beam in the key stage of the construction process are controlled and the horizontal displacement of the top of the pile foundation is controlled by the tensioning control of the tie bar. The results show that the stress and deformation of the structure can meet the design requirements in the whole construction process.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.4

【參考文獻】

相關碩士學位論文 前1條

1 柳江濤;纜索吊裝鋼管混凝土拱橋拱肋的線形問題研究[D];北京交通大學;2011年

，

本文編號：2426963