【摘要】：PC連續(xù)箱梁橋具有結(jié)構(gòu)剛度大、變形小、伸縮縫少,以及抗風(fēng)、抗震能力強(qiáng)、后期養(yǎng)護(hù)簡(jiǎn)單等一系列優(yōu)點(diǎn),廣泛用于公路交通中。隨著高強(qiáng)材料和掛籃懸臂施工的發(fā)展,PC連續(xù)箱梁橋也廣泛用于鐵路建設(shè)中。同時(shí),隨著Midas Civil、ABAQUS 6.12等有限元軟件的興起,結(jié)構(gòu)電算的速度和精度越來(lái)越高,還可通過(guò)有限元模擬與橋梁結(jié)構(gòu)相對(duì)應(yīng)的施工階段、整體線形和應(yīng)力分析、截面受力分析等。為PC連續(xù)箱梁橋的施工監(jiān)測(cè)控制提供了巨大的幫助。但是,由于橋梁工程施工過(guò)程的不可逆性。并且,施工過(guò)程中理論計(jì)算結(jié)果與實(shí)際測(cè)量數(shù)據(jù)都會(huì)存在差異。這都要求技術(shù)人員要理論與實(shí)際相結(jié)合,做好橋梁結(jié)構(gòu)施工過(guò)程中的線形和應(yīng)力的監(jiān)測(cè)與控制工作。本文結(jié)合白臘寨一號(hào)四線橋(32+48+32m連續(xù)梁),應(yīng)用有限元分析軟件Midas Civil和ABAQUS 6.12,對(duì)橋梁進(jìn)行整體結(jié)構(gòu)受力分析、線形分析、主要控制截面應(yīng)力分析、0號(hào)塊最大懸臂階段受力分析等工作。并將計(jì)算結(jié)果運(yùn)用于橋梁施工監(jiān)測(cè)控制。同時(shí),本文還對(duì)以下內(nèi)容做了分析:(1)對(duì)PC連續(xù)箱梁橋的特征及其發(fā)展歷程做簡(jiǎn)要敘述,分析了目前橋梁施工監(jiān)測(cè)控制理論和施工方法,并比較其優(yōu)劣特點(diǎn)。(2)采用有限元軟件Midas Civil,依據(jù)白臘寨一號(hào)四線橋(32+48+32 m)建立空間三維有限元模型。結(jié)合施工設(shè)計(jì)文件和現(xiàn)場(chǎng)工程特點(diǎn),建立懸臂施工中梁段澆筑、預(yù)應(yīng)力張拉、掛籃移動(dòng)等階段的分析模型,對(duì)如何提高有限元模型計(jì)算的準(zhǔn)確性、真實(shí)性進(jìn)行深入的分析。(3)運(yùn)用有限元軟件ABAQUS 6.12,采用內(nèi)力、位移相結(jié)合的加載方法對(duì)橋梁0號(hào)塊進(jìn)行局部受力分析。分別對(duì)0號(hào)塊的最大懸臂狀態(tài)下箱型截面局部受力、以及可能出現(xiàn)裂縫的形態(tài)、對(duì)應(yīng)裂縫成因等進(jìn)行了分析。(4)運(yùn)用Midas Civil對(duì)懸臂施工中的掛籃及構(gòu)件進(jìn)行強(qiáng)度、剛度和穩(wěn)定性分析、不同荷載組合作用下安全系數(shù)分析和結(jié)構(gòu)受力分析。(5)針對(duì)PC連續(xù)梁橋現(xiàn)場(chǎng)施工監(jiān)測(cè)控制的兩大內(nèi)容——應(yīng)力監(jiān)測(cè)和線性監(jiān)控,提出比較完善的現(xiàn)場(chǎng)監(jiān)控體系。并且還對(duì)影響PC連續(xù)梁橋施工監(jiān)測(cè)與控制準(zhǔn)確性的因素進(jìn)行分析,比較理論計(jì)算結(jié)果與實(shí)際施工數(shù)據(jù)之間的差異,提出通過(guò)不斷調(diào)整施工監(jiān)控參數(shù)來(lái)控制掛籃懸臂階段施工的方法,為白臘寨一號(hào)四線橋的順利合攏做出了巨大貢獻(xiàn),并為更好的指導(dǎo)連續(xù)梁橋的施工監(jiān)控提供一定的幫助。
[Abstract]:PC continuous box girder bridge has a series of advantages, such as large structural stiffness, small deformation, less expansion joints, wind resistance, strong seismic capacity, simple later maintenance and so on. It is widely used in highway traffic. With the development of high strength materials and hanging basket cantilever construction, PC continuous box girder bridge is also widely used in railway construction. At the same time, with the rise of Midas Civil,ABAQUS 6.12 and other finite element software, the speed and accuracy of structural computer calculation are getting higher and higher, and the overall alignment and stress analysis can also be carried out through the finite element simulation of the construction stage corresponding to the bridge structure. Force analysis of cross section, etc. It provides great help for the construction monitoring and control of PC continuous box girder bridge. However, due to the irreversibility of the construction process of bridge engineering. Moreover, there will be differences between the theoretical calculation results and the actual measurement data in the construction process. This requires technicians to combine theory with practice and do a good job in the monitoring and control of alignment and stress in the process of bridge structure construction. In this paper, combined with Bailazhai No. 1 fourth Line Bridge (324832m continuous beam), the finite element analysis software Midas Civil and ABAQUS 6.12 are used to analyze the stress of the whole structure of the bridge, the linear analysis and the stress analysis of the main control section. The force analysis of the maximum cantilever stage of block 0 is carried out. The calculation results are applied to bridge construction monitoring and control. At the same time, this paper also analyzes the following contents: (1) the characteristics and development course of PC continuous box girder bridge are briefly described, and the current bridge construction monitoring and control theory and construction method are analyzed. (2) the finite element software Midas Civil, is used to establish the spatial three-dimensional finite element model based on the fourth line bridge of Bailazhai No. 1 (324832 m). According to the construction design documents and the characteristics of field engineering, the analysis models of beam section pouring, prestress tension and hanging basket movement in cantilever construction are established, and how to improve the accuracy of finite element model calculation is established. The authenticity is analyzed deeply. (3) the local force of No. 0 block of bridge is analyzed by using the finite element software ABAQUS 6.12 and the loading method of internal force and displacement. The local force of box section under the maximum cantilever state of block 0, the shape of possible cracks and the causes of corresponding cracks are analyzed respectively. (4) the strength of hanging basket and components in cantilever construction is carried out by using Midas Civil. Stiffness and stability analysis, safety factor analysis and structural stress analysis under different load combinations. (5) stress monitoring and linear monitoring are two main contents of field construction monitoring and control of PC continuous beam bridge. A relatively perfect field monitoring system is put forward. The factors that affect the accuracy of construction monitoring and control of PC continuous beam bridge are also analyzed, and the differences between the theoretical calculation results and the actual construction data are compared. This paper puts forward the method of controlling the cantilever stage of hanging basket by constantly adjusting the construction monitoring parameters, which makes a great contribution to the smooth closure of Bailazhai No. 1 fourth Line Bridge, and provides some help for better guiding the construction monitoring of continuous beam bridge.
【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)】：U445.4

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