【摘要】：本文依托花天河大橋?yàn)楸尘肮こ�，采用Midas/FEA與Midas/Civil對連續(xù)剛構(gòu)橋進(jìn)行全橋施工階段剪力滯效應(yīng)分析。大跨徑連續(xù)剛構(gòu)橋在施工全過程中，主梁截面應(yīng)力是一個不斷變化的過程，將有可能會在某個施工階段內(nèi)力大于全橋合龍后成橋狀態(tài)的內(nèi)力，，也正是由于這種情況的出現(xiàn)，將會導(dǎo)致施工階段內(nèi)力取代全橋合龍后成橋內(nèi)力，被當(dāng)做全橋設(shè)計的截面內(nèi)力控制值。因此在進(jìn)行大跨度連續(xù)剛構(gòu)橋設(shè)計時要充分考慮施工過程的剪力滯效應(yīng)。 當(dāng)前國內(nèi)外許多學(xué)者針對薄壁箱梁剪力滯問題做了大量的研究工作，得出了許多已經(jīng)成熟的理論。本文在前人研究的基礎(chǔ)上，主要對以下內(nèi)容進(jìn)行了研究： ①利用能量變分法計算箱形截面懸臂梁的剪力滯系數(shù)，并將其計算結(jié)果與有限元的方法進(jìn)行對比，并分析剪力滯系數(shù)受布載形式影響。 ②介紹有限元軟件Midas/FEA建立連續(xù)剛構(gòu)橋的模擬方法，并將Midas/Civil與Midas/FEA的相關(guān)計算結(jié)果進(jìn)行對比，以保證二者計算模型的準(zhǔn)確性，為后面章節(jié)進(jìn)行剪力滯系數(shù)計算提供支持。 ③對花天河大橋進(jìn)行全橋施工階段分析，并分析關(guān)鍵截面隨著施工進(jìn)度的剪力滯變化情況。 ④利用有限元程序MIDAS/Civil和MIDAS/FEA，分析4#塊、8#塊、13#塊預(yù)應(yīng)力張拉工況后的4個后續(xù)施工荷載工況（施加下一塊件掛籃、澆筑下一塊混凝土、張拉下一塊件預(yù)應(yīng)力、移動掛籃）對已澆混凝土的剪力滯系數(shù)變化的影響，并總結(jié)相關(guān)規(guī)律。 ⑤利用有限元程序MIDAS/Civil和MIDAS/FEA對最大雙懸臂與成橋狀態(tài)進(jìn)行剪力滯效應(yīng)分析，主要總結(jié)最大雙懸臂及成橋階段剪力滯系數(shù)的分布情況。
[Abstract]:Based on Huatianhe Bridge, the shear lag effect of continuous rigid frame bridge in construction stage is analyzed by Midas/FEA and Midas/Civil. In the whole construction process of long-span continuous rigid frame bridge, the cross-section stress of the main beam is a constantly changing process, and it is possible that the internal force will be greater than the internal force in the state of the bridge formed after the closure of the whole bridge in a certain construction stage, and it is precisely because of this kind of situation that the internal force will be greater than the internal force in the state of the bridge after closing. It will lead to the internal force of the whole bridge after closing the bridge in the construction stage, which is regarded as the control value of the cross-section internal force of the whole bridge design. Therefore, the shear lag effect of construction process should be fully considered in the design of long span continuous rigid frame bridge. At present, many scholars at home and abroad have done a lot of research on the shear lag of thin-walled box girder, and got many mature theories. On the basis of previous studies, this paper mainly studies the following contents: 1 the shear lag coefficient of cantilever beam with box section is calculated by energy variational method, and the results are compared with the finite element method. The influence of distribution form on shear lag coefficient is analyzed. 2. The simulation method of continuous rigid frame bridge by finite element software Midas/FEA is introduced, and the relative calculation results of Midas/Civil and Midas/FEA are compared to ensure the accuracy of the two models. It provides support for the calculation of shear lag coefficient in later chapters. (3) analyze the whole bridge construction stage of Huatianhe Bridge, and analyze the shear lag variation of the key section with the construction progress. (4) using finite element program MIDAS/Civil and MIDAS/FEA, to analyze four subsequent construction load conditions after prestressed tensioning working condition (applying one piece hanging basket, pouring a piece of concrete, tensioning a piece of prestressing force) after prestressed tensioning working condition, using finite element program MIDAS/Civil and MIDAS/FEA,. The influence of moving hanging basket on the variation of shear lag coefficient of cast-in-place concrete is summarized. (5) the shear lag effect of the maximum double cantilever and the bridge is analyzed by using the finite element program MIDAS/Civil and MIDAS/FEA, and the distribution of the shear lag coefficient in the maximum double cantilever and the completed bridge is summarized.
【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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