超高层框架—核心筒体系考虑收缩徐变的竖向变形差分析

发布时间：2018-05-14 17:54

本文选题：高层建筑 + 竖向变形差　；参考：《青岛理工大学》2016年硕士论文

【摘要】：随着社会和经济的发展,超高层建筑的数量与日俱增。但是伴随着超高层建筑高度的增高、施工周期的延长,框架柱与核心筒之间的竖向变形差也越来越大,其对建筑正常使用的影响逐渐受到土木领域的重视。自二十世纪60年代以来,国内外学者先后通过现场观测竖向变形、推导竖向变形差公式以及有限元模拟分析等方法对超高层建筑的竖向变形差进行研究。目前,土木工程领域对竖向变形差的研究主要集中于是否考虑施工过程以及收缩徐变等影响因素上,对超高层建筑的结构设计和施工方式有重要的意义。本文采用有限元软件MIDAS GEN对某复杂超高层建筑进行建模分析,针对不同加载方式和混凝土收缩徐变对竖向变形差的影响展开研究,主要的研究工作和研究成果如下:(1)模拟分析超高层建筑在“一次性加载”和模拟施工加载条件下框架柱与核心筒的竖向变形,分析不同加载方式对竖向变形差的影响。结果表明:两种加载方式下的竖向变形在延高度方向上的分布规律是不同的,在“一次性加载”条件下竖向构件的变形由底层向上逐渐增大,在最顶层竖向变形值取最大值;而在模拟施工加载方式下竖向构件的变形值则是从底层向上先增大后变小,在中间层取得最大竖向变形值;在“一次性加载”条件下框架柱之间以及剪力墙之间的竖向变形差别较大,而在模拟施工条件下框架柱之间以及剪力墙之间的竖向变形则相对差别较小;在不同加载方式下框架柱与核心筒之间的竖向变形差发展趋势与相应加载方式下构件竖向变形的发展趋势类似,即“一次性加载”方式下从下到上逐渐增大,模拟施工加载方式下由下到上的发展趋势为先增大后减小,成鱼肚状。(2)模拟分析是否考虑混凝土收缩徐变特性时框架柱与核心筒的竖向变形,对是否考虑混凝土收缩徐变特性时竖向变形差的数据进行统计分析。结果表明:混凝土收缩徐变效应对超高层建筑框架柱竖向变形的影响约占其总变形量的38.7%左右,而对于核心筒竖向变形的影响约占其总变形量的43%左右,但由于框架柱的变形量远大于核心筒的变形量,所以在相同的受力条件下框架柱竖向变形变化值上要比核心筒的变化值更大;对于框架柱与核心筒之间的变形差而言,由于考虑收缩徐变时框架柱的变形增量大于核心筒的变形增量,所以混凝土的收缩徐变效应会加大建筑的竖向变形差。(3)模拟分析超高层建筑的框架柱为钢柱和混凝土柱时构件的竖向变形,对竖向变形差数据进行统计分析。结果表明:钢框架柱与核心筒之间的竖向变形差仅为混凝土框架柱与核心筒竖向变形差的60%左右。由于钢材本身几乎没有时间依存特性,使得钢框架柱在使用过程中几乎不发生收缩徐变,钢框架柱的竖向变形小于混凝土框架柱,但两种情况下核心筒的变形相差不大,所以选用钢框架柱比选用混凝土框架柱时建筑的竖向变形差小。
[Abstract]:With the development of society and economy, the number of super high-rise buildings is increasing. But with the increase of the height of the super high building, the extension of the construction period, the vertical deformation difference between the frame column and the core tube is becoming more and more big, and its influence on the normal use of the building is gradually paid attention to in the field of soil and wood. Since 60s twentieth Century, At present, the study of vertical deformation difference in the field of civil engineering mainly focuses on whether to consider the influence factors such as construction pass and shrinkage creep. The structure design and construction methods of the storey building are of great significance. In this paper, the finite element software MIDAS GEN is used to model and analyze a complex super high rise building, and the effect of different loading ways and concrete shrinkage and creep on the vertical deformation difference is studied. The main research work and research results are as follows: (1) simulation and analysis of super high rise building The vertical deformation of frame column and core tube is built under the condition of "one time loading" and simulated construction loading. The effect of different loading methods on the vertical deformation difference is analyzed. The results show that the vertical deformation distribution in the direction of the two loading modes is different, and the deformation of the vertical member under the condition of "one time loading" From the bottom up, the maximum vertical deformation value is obtained at the top level, and the deformation value of the vertical member is increased from the bottom to the bottom, and the maximum vertical deformation value is obtained in the middle layer. The vertical deformation difference between the frame column and the shear wall is more different under the condition of "one time loading". The vertical deformation between the frame column and the shear wall is relatively small under the simulated construction conditions, and the vertical deformation difference between the frame column and the core tube under different loading modes is similar to the trend of the vertical deformation of the component under the corresponding loading mode, that is, the "one time loading" mode is from bottom to up. Gradually, the development trend of the simulated construction loading mode from bottom to upper is first increasing and then decreasing, and the fish belly shape. (2) whether the vertical deformation of the frame column and the core tube is considered when the concrete shrinkage and creep characteristics are considered, and the data of whether the vertical deformation difference is considered when the shrinkage and creep characteristics of concrete are taken into consideration. The effect of the shrinkage and creep effect on the vertical deformation of the frame column of the high rise building accounts for about 38.7% of the total deformation, while the effect on the vertical deformation of the core tube accounts for about 43% of the total deformation, but the deformation of the frame column is far greater than the deformation of the core cylinder, so the vertical deformation of the frame column is changed under the same stress conditions. As for the deformation difference between the frame column and the core barrel, the deformation increment of the frame column is greater than the deformation increment of the core cylinder for the shrinkage and creep, so the shrinkage and creep effect of the concrete will increase the vertical deformation difference between the frame column and the core barrel. (3) the frame column of the super high rise building is a steel column. The vertical deformation data of the vertical deformation of the concrete column and the concrete column are statistically analyzed. The results show that the vertical deformation difference between the steel frame column and the core tube is only about 60% of the vertical deformation of the concrete frame column and the core tube. Without shrinkage and creep, the vertical deformation of the steel frame column is less than that of the concrete frame column, but the deformation of the core tube is very small in the two cases, so the vertical deformation difference between the steel frame column and the concrete frame column is smaller than that of the concrete frame column.

【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU973.17

【参考文献】