PC箱形截面连续刚构桥施工阶段剪力滞效应分析
发布时间：2019-01-28 19:13
【摘要】：本文依托花天河大桥为背景工程，采用Midas/FEA与Midas/Civil对连续刚构桥进行全桥施工阶段剪力滞效应分析。大跨径连续刚构桥在施工全过程中，主梁截面应力是一个不断变化的过程，将有可能会在某个施工阶段内力大于全桥合龙后成桥状态的内力，，也正是由于这种情况的出现，将会导致施工阶段内力取代全桥合龙后成桥内力，被当做全桥设计的截面内力控制值。因此在进行大跨度连续刚构桥设计时要充分考虑施工过程的剪力滞效应。 当前国内外许多学者针对薄壁箱梁剪力滞问题做了大量的研究工作，得出了许多已经成熟的理论。本文在前人研究的基础上，主要对以下内容进行了研究： ①利用能量变分法计算箱形截面悬臂梁的剪力滞系数，并将其计算结果与有限元的方法进行对比，并分析剪力滞系数受布载形式影响。 ②介绍有限元软件Midas/FEA建立连续刚构桥的模拟方法，并将Midas/Civil与Midas/FEA的相关计算结果进行对比，以保证二者计算模型的准确性，为后面章节进行剪力滞系数计算提供支持。 ③对花天河大桥进行全桥施工阶段分析，并分析关键截面随着施工进度的剪力滞变化情况。 ④利用有限元程序MIDAS/Civil和MIDAS/FEA，分析4#块、8#块、13#块预应力张拉工况后的4个后续施工荷载工况（施加下一块件挂篮、浇筑下一块混凝土、张拉下一块件预应力、移动挂篮）对已浇混凝土的剪力滞系数变化的影响，并总结相关规律。 ⑤利用有限元程序MIDAS/Civil和MIDAS/FEA对最大双悬臂与成桥状态进行剪力滞效应分析，主要总结最大双悬臂及成桥阶段剪力滞系数的分布情况。
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23
本文编号：2417228
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23
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