【摘要】 以南京金融城二期C1塔楼偏置超高层框架-核心筒结构为研究对象,建立了精细化ANSYS有限元模型,用以模拟混凝土收缩徐变对实际施工过程的影响。按照施工建造的流程,逐步激活各个施工步骤的结构单元,以模拟超高层结构逐层施工的过程;采用龄期调整有效模量法计算徐变变形,将混凝土徐变转化为拟弹性问题,采用等效降温法模拟混凝土收缩,并利用ANSYSAPDL语言编写收缩徐变的计算程序,以模拟考虑混凝土收缩徐变作用的施工全过程,并获得结构施工阶段的竖向变形。研究了混凝土收缩徐变、施工找平对结构竖向变形的影响,结果表明收缩徐变变形量可占总变形量的一半左右,不考虑施工找平会导致结构实际标高远远低于设计标高;对使用阶段的竖向变形进行了模拟,发现竣工10年内是结构竖向变形发展较为迅速的时期,竣工10年后竖向变形渐渐趋于稳定;研究了结构不规则缩进对结构侧向变形的影响,结果表明由于偏心作用Y向侧移远大于X向侧移。更多还原

【Abstract】 A refined ANSYS finite element model was established to simulate the impact of concrete shrinkage and creep on the actual construction process, taking the offset high-rise frame-core tube structure of C1 Tower in Nanjing Financial City Phase II as the research object. According to the construction process, gradually activate the structural units of each construction step to simulate the construction process of super high-rise structures layer by layer; The age adjusted effective modulus method is used to calculate creep deformation, transforming concrete creep into a quasi elastic problem. The equivalent temperature reduction method is used to simulate concrete shrinkage, and a calculation program for shrinkage and creep is written using ANSYS APDL language to simulate the entire construction process considering the effect of concrete shrinkage and creep, and to obtain the vertical deformation during the structural construction stage. We studied the effects of concrete shrinkage and creep, as well as construction leveling, on the vertical deformation of the structure. The results showed that the shrinkage and creep deformation can account for about half of the total deformation. Failure to consider construction leveling can result in the actual elevation of the structure being much lower than the design elevation; We simulated the vertical deformation during the use stage and found that within 10 years of completion, the vertical deformation of the structure developed rapidly. After 10 years of completion, the vertical deformation gradually stabilized; The effect of irregular indentation on the lateral deformation of the structure was studied, and the results showed that due to eccentricity, the Y-direction lateral displacement was much greater than the X-direction lateral displacement.更多还原