【摘要】：本文首先簡(jiǎn)要地介紹了頂推施工法的應(yīng)用與發(fā)展歷史,對(duì)比了傳統(tǒng)拖拉式頂推與新型步履式頂推兩者的優(yōu)缺點(diǎn)。隨后,以昆明南連接線鐵路跨線橋?yàn)楣こ瘫尘霸敿?xì)描述了新型步履式頂推施工工藝的控制系統(tǒng)與施工工序,并在此基礎(chǔ)上,采用Midas Civil有限元軟件建立了全橋桿系有限元模型,進(jìn)行了頂推施工全過(guò)程的仿真分析,了解頂推過(guò)程梁體的整體受力,確定了頂推過(guò)程中混凝土橋面板與鋼箱梁的最不利工況；在最不利工況下,運(yùn)用ANSYS大型有限元分析軟件,建立全橋梁-殼-實(shí)-接觸混合有限元模型,著重分析了鋼箱梁與橡膠墊塊的接觸狀態(tài),以此來(lái)說(shuō)明在支承區(qū)域范圍內(nèi)主梁各構(gòu)件的局部受力情況。最后,結(jié)合工程實(shí)際,進(jìn)行了相關(guān)參數(shù)對(duì)鋼箱梁局部受力的分析研究,總結(jié)出一些規(guī)律,為今后更多采用步履式頂推施工法的橋梁提供參考與借鑒。分析研究成果如下：1)在鋼混組合梁橋中,混凝土橋面板通過(guò)剪力連接件與鋼箱梁形成整體,共同受力,因此在該處的混凝土橋面板受力較大,在某些工況下頂面存在開裂風(fēng)險(xiǎn)；2)橡膠墊塊能較好地適應(yīng)支承區(qū)域內(nèi)梁體的轉(zhuǎn)角位移,從而使梁體受力均勻,而鋼墊塊則使得支承區(qū)域內(nèi)梁體局部受力效應(yīng)明顯,構(gòu)件應(yīng)力水平較大。3)剛度較小的橡膠墊塊通過(guò)改善梁底與其接觸的不均勻性來(lái)影響構(gòu)件的局部受力,而墊塊寬度則通過(guò)橫向轉(zhuǎn)移支承區(qū)域內(nèi)支反力的作用點(diǎn)來(lái)影響構(gòu)件的局部受力；4)分析了頂推液壓不同步對(duì)構(gòu)件局部受力的影響。得出同一墩上左右兩側(cè)縱向頂推不同步比豎向頂升不同步對(duì)構(gòu)件局部受力的影響大,且頂推不同步均會(huì)造成梁體中軸線的橫向偏移,最后確定了該橋頂推不同步下的安全控制閾值；
[Abstract]:This paper introduces briefly the application and development history of the push-push construction method, and compares the advantages and disadvantages between the traditional tow-push method and the new-type walking push-push method. Then, the control system and construction procedure of the new walking pushing construction technology are described in detail with the engineering background of Kunming South Link Railway Bridge. On the basis of this, the finite element model of the whole bridge bar system is established by using Midas Civil finite element software. The simulation analysis of the whole process of jacking construction is carried out to understand the whole force of the beam body during the jacking process, and the most unfavorable working conditions of concrete bridge deck and steel box girder are determined. Under the most unfavorable working conditions, the ANSYS software is used to analyze the whole body of the beam. The hybrid finite element model of the whole bridge, shell and real contact is established, and the contact state between the steel box girder and the rubber cushion is analyzed emphatically, so as to explain the local force of the main beam members in the support area. Finally, combined with the engineering practice, the analysis and research on the local force of steel box girder are carried out, and some rules are summarized, which can provide reference for more bridges which adopt the step pushing construction method in the future. The research results are as follows: (1) in the steel-concrete composite beam bridge, the concrete deck slab forms a whole force with the steel box girder through the shear connection, so the concrete deck slab in the place has a large force. Under some working conditions, there is a risk of cracking on the top surface. 2) the rubber gasket can better adapt to the angular displacement of the beam body in the supporting area, so that the beam body is subjected to uniform force, while the steel cushion block makes the local force effect of the beam body in the supporting area obvious. The rubber cushion with lower stiffness and greater stress level affects the local force of the member by improving the non-uniformity of the contact between the beam bottom and the member. The width of the gasket affects the local force of the member by transference the acting point of the support reaction force in the support area. 4) the influence of the non-synchronism of the thrust hydraulic pressure on the local force of the member is analyzed. It is concluded that the longitudinal push on the left and right sides of the same pier has more influence on the local force of the member than that on the vertical uplift, and the lateral deviation of the central axis of the beam will be caused by the non-synchronous push. Finally, the safety control threshold of the bridge is determined.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.462

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本文編號(hào)：2202545