【摘要】：高墩大跨連續(xù)剛構(gòu)橋以其施工簡便、受力合理、造價經(jīng)濟的優(yōu)點，在國內(nèi)得到了廣泛的應(yīng)用。對于修建在山區(qū)峽谷地區(qū)的連續(xù)剛構(gòu)橋，由于受到地貌限制，主梁邊中跨比不得不做的異于普通橋梁，這就使得采用懸臂澆筑施工的連續(xù)剛構(gòu)橋在對稱懸臂澆筑的基礎(chǔ)上單懸臂澆筑剩余梁段。為了保證施工過程中的安全性，研究此類施工方法在橋梁施工階段的結(jié)構(gòu)受力特點與穩(wěn)定性顯得尤為重要。 四川甘孜洲大渡河特大橋是一座典型的采用不對稱澆筑施工的連續(xù)剛構(gòu)橋，在邊跨合攏后中跨側(cè)單懸臂澆筑多達(dá)5個號塊，，本文以大渡河大橋施工過程作為分析對象，針對施工過程中的有關(guān)問題進行了研究與分析： ①利用平面分析軟件Midas建立不對稱懸臂澆筑、對稱懸臂澆筑施工階段有限元模型，分析兩種施工方法在施工階段的應(yīng)力差異，并針對邊跨支座反力隨不對稱懸臂澆筑施工階段變化規(guī)律進行了相關(guān)研究。 ②利用零初始位置安裝法與切線位置安裝法在空間有限元軟件ANSYS中實現(xiàn)懸臂澆筑施工階段分析，并且驗證了其可行性與精度。利用零位置安裝法建立大渡河大橋施工階段空間仿真模型，針對施工階段剪力滯效應(yīng)進行分析，得出剪力滯效應(yīng)隨施工階段變化規(guī)律，并對該橋最大單懸臂、雙懸臂施工階段進行空間應(yīng)力分析。 ③大渡河大橋不對稱澆筑施工全過程彈性穩(wěn)定分析：通過對不對稱懸臂澆筑施工、對稱懸臂澆筑施工，施工階段穩(wěn)定特征值對比分析，發(fā)現(xiàn)不對稱懸臂澆筑施工在中跨側(cè)單懸臂澆筑階段穩(wěn)定特征值躍階提升的現(xiàn)象。 ④最大懸臂狀態(tài)的穩(wěn)定性研究：針對施工過程中的風(fēng)荷載、掛籃跌落荷載、節(jié)段自重、施工荷載，考慮了四種可能的荷載工況。針對不對稱澆筑施工最大單懸臂、雙懸臂施工階段進行彈性穩(wěn)定性與考慮了幾何非線性與材料非線性的非線性屈曲分析，得出在以上四種荷載工況作用下的穩(wěn)定特征值與荷載加載系數(shù)，能夠?qū)υ摌蛟谧畲髥螒冶邸㈦p懸臂階段的施工穩(wěn)定性做出評價，可給實際工程提供參考。
[Abstract]:The continuous rigid frame bridge with high piers and long span has been widely used in China because of its advantages of simple construction, reasonable force and economical cost. For continuous rigid frame bridges built in mountain canyons, due to geomorphological constraints, the ratio of the middle to middle span of the main girder must be different from that of ordinary bridges. This makes the continuous rigid frame bridge constructed by cantilever pouring on the basis of symmetrical cantilever pouring the residual beam segment with a single cantilever. In order to ensure the safety of the construction process, it is particularly important to study the structural stress characteristics and stability of this kind of construction method in the bridge construction stage. The Ganzizhou Dadu River Bridge in Sichuan Province is a typical continuous rigid frame bridge constructed by asymmetric pouring. After the closure of the side span, there are up to 5 blocks of single cantilever in the middle span. The construction process of the Dadu River Bridge is taken as the analysis object in this paper. The related problems in the construction process are studied and analyzed: 1 the finite element model of asymmetric cantilever pouring and symmetrical cantilever pouring construction stage is established by using plane analysis software Midas. The stress difference between the two construction methods in the construction stage is analyzed, and the law of the reaction force of the side span bearing with the construction stage of asymmetric cantilever pouring is studied. (2) the method of zero initial position installation and tangent position installation is used to analyze the construction stage of cantilever pouring in ANSYS, and the feasibility and accuracy of the method are verified. The spatial simulation model of Dadu River Bridge in construction stage is established by using the zero-position installation method. The shear lag effect in construction stage is analyzed, and the variation law of shear lag effect with construction stage is obtained, and the maximum single cantilever of the bridge is obtained. The spatial stress analysis of double cantilever construction stage is carried out. (3) elastic stability analysis of Dadu River Bridge during the whole process of asymmetric pouring construction: through the construction of asymmetric cantilever pouring, the characteristic values of stability in construction stage are compared and analyzed. It is found that the steady eigenvalue of asymmetric cantilever construction in the stage of mid-span single cantilever placement is elevated by step. (4) study on the stability of the maximum cantilever state: considering the wind load, basket drop load, segment weight and construction load during construction, four possible load conditions are considered. According to the maximum single cantilever and double cantilever in asymmetric pouring construction, the elastic stability and nonlinear buckling analysis of geometric nonlinearity and material nonlinearity are carried out. The stability eigenvalues and load loading coefficients under the above four load conditions can be obtained to evaluate the construction stability of the bridge in the maximum single cantilever and double cantilever stages, which can be used as a reference for practical engineering.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.23

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本文編號：2318755