【摘要】：整體頂推施工工藝在大跨連續(xù)拱橋中的應(yīng)用比較少,可以查閱的資料比較少。另外,大跨連續(xù)組合拱橋在頂推過(guò)程中,由于主橋結(jié)構(gòu)的邊界條件不斷地發(fā)生變化,造成結(jié)構(gòu)體系受力也極其復(fù)雜多變。因此,為了確保整體頂推過(guò)程的安全和順利進(jìn)行,對(duì)主橋各個(gè)構(gòu)件進(jìn)行應(yīng)力監(jiān)控就非常重要。本文以孔李淮河大橋主橋結(jié)構(gòu)的整體頂推為背景,基于Midas Civil有限元軟件,對(duì)主橋結(jié)構(gòu)所采用的三跨連續(xù)梁拱組合體系拱橋整體頂推施工過(guò)程進(jìn)行仿真模擬,利用模擬結(jié)果在現(xiàn)場(chǎng)布置相關(guān)測(cè)點(diǎn),得到實(shí)測(cè)數(shù)據(jù)。對(duì)應(yīng)力進(jìn)行對(duì)比分析,找出主橋結(jié)構(gòu)在三輪整體頂推施工過(guò)程中的最不利階段、相應(yīng)截面應(yīng)力的最大位置和大小,以及各結(jié)構(gòu)構(gòu)件的應(yīng)力變化規(guī)律,為以后同類型的梁拱組合體系拱橋在整體頂推方面提供更多的參考,為同類型橋的整體頂推施工的研究提供新的思路和方向。論文主要做了以下幾方面工作:第一,研究孔李淮河大橋主橋結(jié)構(gòu)的施工方案及整體頂推工藝。結(jié)構(gòu)采用三跨鋼箱下承式連續(xù)系桿拱,三跨跨徑布置為110m+180m+110m,其結(jié)構(gòu)主要由三大系統(tǒng)構(gòu)成:拱肋系統(tǒng)、剛性系桿(鋼箱梁)和柔性系桿(體外預(yù)應(yīng)力)系統(tǒng)、吊桿系統(tǒng)。該結(jié)構(gòu)對(duì)應(yīng)三跨分三輪進(jìn)行頂推。第二,針對(duì)大橋主橋結(jié)構(gòu)所采用整體頂推施工方案,根據(jù)主橋結(jié)構(gòu)的構(gòu)件布置形式,基于Midas Civil有限元軟件建立了主橋結(jié)構(gòu)的有限元模型,并定義了整體頂推過(guò)程的施工階段的劃分。第三,針對(duì)結(jié)構(gòu)頂推方案進(jìn)行模擬,提取仿真模擬結(jié)果。提取三輪頂推過(guò)程中主橋結(jié)構(gòu)主要構(gòu)件的應(yīng)力包絡(luò)圖,找到各個(gè)構(gòu)件的最不利截面位置、對(duì)應(yīng)的頂推階段和最不利的截面應(yīng)力值。第四,根據(jù)模擬結(jié)果在現(xiàn)場(chǎng)布置應(yīng)變傳感器,采集實(shí)測(cè)結(jié)果。通過(guò)對(duì)整體頂推施工過(guò)程進(jìn)行全程不間斷應(yīng)力(應(yīng)變)監(jiān)測(cè),實(shí)現(xiàn)對(duì)主橋整體頂推施工的應(yīng)力控制,監(jiān)測(cè)主橋結(jié)構(gòu)在整體頂推施工過(guò)程中每個(gè)施工階段的結(jié)構(gòu)實(shí)際受力情況。第五,對(duì)仿真與實(shí)測(cè)應(yīng)力值進(jìn)行對(duì)比分析。將頂推結(jié)構(gòu)在第一、第二輪以及第三輪頂推過(guò)程中不利截面上測(cè)點(diǎn)的實(shí)測(cè)應(yīng)力與仿真模擬結(jié)果進(jìn)行對(duì)比分析,發(fā)現(xiàn)兩者應(yīng)力曲線的吻合程度較高,結(jié)構(gòu)在頂推過(guò)程中的受力狀態(tài)基本符合設(shè)計(jì)要求,以及建立的Midas Civil有限元計(jì)算模型能夠很好地模擬頂推過(guò)程中構(gòu)件的受力性能。
[Abstract]:The application of integral thrust construction technology in long span continuous arch bridge is less, and the data can be consulted less. In addition, due to the continuous change of the boundary conditions of the main bridge structure, the structural system is also very complex and changeable during the jacking process of the long-span continuous composite arch bridge. Therefore, in order to ensure the safety and smooth progress of the whole thrust process, it is very important to monitor the stress of each component of the main bridge. Based on the whole pushing of the main bridge structure of Kongli Huaihe River Bridge, based on Midas Civil finite element software, this paper simulates the whole pushing construction process of the three-span continuous beam-arch composite system arch bridge used in the main bridge structure. Based on the simulation results, the relevant measurement points are arranged in the field, and the measured data are obtained. By comparing and analyzing the stress, the paper finds out the most disadvantageous stage of the main bridge structure in the course of three-wheeled integral pushing construction, the maximum position and magnitude of the corresponding section stress, and the law of the stress variation of each structural member. It provides more references for the whole pushing of the same type of beam and arch composite system arch bridge in the future, and provides new ideas and directions for the research of the same type bridge's integral pushing construction. The main work of this paper is as follows: first, the construction scheme and integral pushing technology of the main bridge structure of Kongli Huaihe River Bridge are studied. The structure is composed of three main systems: arch system, rigid tie bar system (steel box girder), flexible tie bar system (external prestressing force) system, and suspender system. The structure is composed of three parts: arch rib system, rigid tie bar (steel box girder) system, flexible tie bar system (external prestressing force) system. This structure is corresponding to three-span three-wheel thrust. Secondly, the finite element model of the main bridge structure is established based on the Midas Civil finite element software, according to the integral thrust construction scheme adopted in the main bridge structure, according to the structure layout form of the main bridge structure. At the same time, the division of the construction stage of the whole pushing process is defined. Thirdly, the simulation results are extracted from the structure thrust scheme. The stress envelope diagram of the main components of the main bridge structure is extracted during the three-wheeled thrust process, and the most unfavorable section position of each member, the corresponding pushing stage and the most unfavorable section stress value are found. Fourthly, according to the simulation results, the strain sensors are arranged in the field and the measured results are collected. By monitoring the whole uninterrupted stress (strain) of the whole thrust construction process, the stress control of the whole thrust construction of the main bridge is realized, and the actual stress situation of the main bridge structure in each construction stage during the whole jacking construction process is monitored. Fifth, the simulation and measured stress values are compared and analyzed. By comparing the measured stresses on the unfavorable cross sections of the first, second and third wheeled thrust structures with the simulation results, it is found that the stress curves of the two structures are in good agreement with each other. The stress state of the structure in the process of pushing basically accords with the design requirements, and the Midas Civil finite element calculation model can well simulate the mechanical behavior of the members in the process of pushing.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U446;U445

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