西安金融中心超高层施工竖向变形分析研究

发布时间：2018-01-31 19:10

本文关键词： 超高层竖向变形收缩徐变施工仿真分析变形控制　出处：《建筑结构》2017年21期 　论文类型：期刊论文

【摘要】：为在施工过程中采取有效的竖向变形控制措施,控制完工后结构实际标高与设计标高的差异值在一定范围内,并减小因核心筒与巨柱竖向变形差引起的结构附加应力,选取CEB-FIP预测模型,根据实际施工进度建立结构有限元分析模型,考虑混凝土收缩徐变、施工找平等因素,综合有限元法、单元生死、分步加荷等技术对不同施工模拟方案下的西安金融中心结构进行材料、几何及边界条件时变模拟,得到了施工过程中结构各层竖向变形以及核心筒与巨柱竖向变形差的具体数值及变化规律。分析结果表明,混凝土收缩徐变对结构竖向变形影响较大,在整个施工过程中所占比例为47.33%~58.59%;在对计算结果进行深入研究的基础上,给出预变形控制建议措施,对后续巨柱核心筒结构超高层施工具有指导意义。
[Abstract]:In order to take effective vertical deformation control measures in the construction process, the difference between the actual elevation of the structure and the design elevation is controlled in a certain range. And reduce the additional stress caused by the vertical deformation difference between the core tube and the giant column, select the CEB-FIP prediction model, establish the finite element analysis model of the structure according to the actual construction schedule, consider the shrinkage and creep of concrete. Construction leveling factors, comprehensive finite element method, element life and death, step by step loading and other techniques to different construction simulation schemes of Xi'an financial center structure materials, geometry and boundary conditions time-varying simulation. The concrete values and variation rules of vertical deformation difference between core tube and giant column are obtained during construction. The results show that concrete shrinkage and creep have great influence on vertical deformation of structure. The proportion in the whole construction process is 47.33 and 58.59; On the basis of deep research on the calculation results, the paper gives some advices for the control of pre-deformation, which is of guiding significance for the follow-up super-high-rise construction of the core tube structure of giant columns.
【作者单位】：北京建工四建工程建设有限公司;北京市建筑工程研究院有限责任公司;
【基金】：国家自然科学基金项目(51178205)
【分类号】：TU974
【正文快照】： 2北京市建筑工程研究院有限责任公司,北京100039)0引言框架-核心筒结构将框架与剪力墙两者结合起来,取长补短,共同抵抗竖向荷载和水平荷载,可以满足大多数建筑物的高度要求,是目前超高层建筑常用的结构体系之一[1]。对于框架-核心筒体系而言,由于框架部分与核心筒部分竖向构件

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