框架—核心筒結(jié)構(gòu)豎向收縮徐變效應(yīng)施工模擬分析
[Abstract]:In order to better meet the needs of building functions such as plane use, space segmentation, landscape view and so on, high-rise and super-high-rise buildings tend to adopt the frame-core tube structure system [1]. Widely used in office buildings, hotels, multi-purpose buildings. However, with the building height becoming higher and higher, the vertical deformation difference between different vertical members must be considered. In this paper, the mechanism of shrinkage and creep of concrete, the influence factors of shrinkage and creep and the calculation method of creep under variable stress are introduced in this paper. Then the simple structure is calculated and analyzed, and the difference between shrinkage and creep and time-varying characteristics of concrete material is considered by comparing different loading methods, and the necessity of using construction simulation to calculate the vertical deformation of the structure is obtained. Then, taking the concrete frame-core tube structure as the calculation prototype, the vertical elastic, shrinkage and creep deformation of the structure is analyzed by using the general finite element software Midas/gen, and the deformation law is summarized. An accurate construction simulation method based on ACI PCA shrinkage and creep calculation model is put forward in this paper. The influence factors of vertical deformation are taken into account in the model calculation. It is concluded that the construction speed and the reinforcement ratio have a great influence; and the faster the construction speed the bigger the total deformation, the greater the reinforcement ratio is and the smaller the creep rate is, and the less the influence of environmental relative humidity is. Then the difference of deformation between wall and column in different periods of concrete frame-core tube structure is compared, and the bending moment, shear force and axial force in column are calculated by different analysis methods, and the variation law is found. The concrete filled steel tube column with concrete filled steel tube frame and core tube structure is treated with special treatment method to analyze the deformation difference and internal force caused by the deformation of the vertical member of the structure. In this paper, a method for solving the problem of excessive bending moment at the end of a steel beam is put forward, in which the end of the steel beam is connected with the external phase of the wall with a lag of 5 stories. Finally, on the basis of the analysis of the vertical deformation difference effect of frame-core tube, this paper puts forward some countermeasures to the vertical deformation difference from the aspects of concrete material, structure design and construction.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TU973.17
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