本文關(guān)鍵詞： 連續(xù)箱形梁橋 仿真分析 施工監(jiān)控 局部應(yīng)力分析　出處：《揚州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：預(yù)應(yīng)力混凝土連續(xù)梁橋以其結(jié)構(gòu)受力性能好、變形小、伸縮縫少、行車平順舒適、造型簡潔美觀、養(yǎng)護(hù)工程量少、抗震能力強等特點而成為最富有競爭力的主要橋型之一。預(yù)應(yīng)力混凝土連續(xù)箱梁橋經(jīng)常采用懸臂澆筑法施工,其施工難度大,過程復(fù)雜,對大跨度橋梁進(jìn)行施工監(jiān)測與控制是確保成橋狀態(tài)符合設(shè)計要求的重要措施,同時也是保證施工質(zhì)量和施工安全的重要的環(huán)節(jié)。 本文以鹽邵河大橋主橋為工程背景,主要完成了以下內(nèi)容： (1)簡要介紹了連續(xù)梁橋的發(fā)展現(xiàn)狀和受力特點,以及國內(nèi)外施工監(jiān)控的意義、內(nèi)容和發(fā)展現(xiàn)狀。 (2)對連續(xù)箱形梁橋施工監(jiān)控仿真過程中的相關(guān)理論進(jìn)行了簡要的介紹,主要包括仿真計算方法和有限元理論。 (3)針對鹽邵河大橋的施工過程,運用有限元軟件Midas/civil建立全橋施工仿真分析模型,給出最大懸臂狀態(tài)和成橋狀態(tài)的位移、內(nèi)力和應(yīng)力的情況,并對比它們之間的差異。 (4)對橋梁施工現(xiàn)場監(jiān)控方案(包括線形和內(nèi)力)進(jìn)行了簡要介紹,在線形監(jiān)控方面給出了最大懸臂狀態(tài)和成橋狀態(tài)的高程變化情況,在應(yīng)力監(jiān)測方面給出了幾個關(guān)鍵截面的控制應(yīng)力,并將現(xiàn)場實測值與理論值進(jìn)行對比分析。 (5)運用ABAQUS有限元軟件建立0#塊局部實體模型,給出了0#塊的最大懸臂狀態(tài)和成橋狀態(tài)的頂板、底板、腹板和橫隔板的應(yīng)力分布情況,指出了拉應(yīng)力較大的部位和應(yīng)力集中的部位。 分析結(jié)果表明：采用Midas/civil對施工過程進(jìn)行有限元分析對施工監(jiān)控具有借鑒和指導(dǎo)作用,驗證了施工監(jiān)控實測值與理論值基本符合。從采用ABAQUS對0#塊的分析結(jié)果可以看出在頂板與橫隔板連接處、底板與橫隔板連接處以及腹板與頂板的連接處都出現(xiàn)了不同程度的拉應(yīng)力,容易出現(xiàn)裂縫,施工過程中要采取措施加以預(yù)防。
[Abstract]:The prestressed concrete continuous beam bridge has the advantages of good mechanical performance, small deformation, less expansion joints, smooth and comfortable driving, simple and beautiful shape, and less maintenance works. The prestressed concrete continuous box girder bridge is often constructed by cantilever pouring method, which is difficult and complex. Monitoring and controlling the construction of long-span bridges is an important measure to ensure that the state of the bridge meets the design requirements, and is also an important link to ensure the construction quality and construction safety. This paper takes the main bridge of Yanshao River Bridge as the engineering background, mainly completes the following contents:. This paper briefly introduces the development status and mechanical characteristics of continuous beam bridges, as well as the significance, content and development status of construction monitoring at home and abroad. This paper briefly introduces the related theories of continuous box girder bridge construction monitoring and simulation process, mainly including the simulation calculation method and the finite element theory. In view of the construction process of Yanshao River Bridge, the finite element software Midas/civil is used to establish the simulation analysis model of the whole bridge construction. The displacement, internal force and stress of the maximum cantilever state and the bridge state are given, and the differences between them are compared. In this paper, the monitoring scheme of bridge construction site (including linear and internal force) is briefly introduced, and the height variation of the maximum cantilever state and bridge state is given in the aspect of linear monitoring. In the aspect of stress monitoring, the control stress of several key sections is given, and the field measured value is compared with the theoretical value. The local solid model of 0# block is established by using ABAQUS finite element software, and the stress distribution of roof, bottom plate, web plate and transverse partition of the largest cantilever state and bridge state of 0# block is given. The positions where the tensile stress is high and where the stress is concentrated are pointed out. The results show that the finite element analysis of the construction process by using Midas/civil can be used for reference and guidance in construction monitoring. It is verified that the measured value of construction monitoring is basically consistent with the theoretical value. From the analysis of the block of 0# by using ABAQUS, it can be seen that there is a connection between the roof and the transverse partition. The connection between the bottom plate and the transverse partition and the connection between the web and the roof have different degrees of tensile stress, which are apt to appear cracks, and some measures should be taken to prevent them in the process of construction.
【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445

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