上海环球金融中心施工竖向变形分析

上海环球金融中心是世界上最高的建筑之一，施工过程中结构竖向变形累积问题尤为突出，有必要对其进行研究。建立了适于结构施工模拟的精细化有限元模型，综合时变结构离散分析法与龄期调整有效模量法，实现了超高层结构施工全过程分析；将整个结构按照施工过程划分成一系列材料参数、几何参数、荷载边界条件不同的平衡体系；通过对各平衡体系的有限元求解，实现了考虑徐变效应的施工全过程模拟，获得结构各施工阶段的竖向变形、层间压缩量以及框筒内外相对竖向变形，分析了施工过程中上海环球金融中心竖向变形。将模拟结果与一次性加载和不考虑徐变的施工模拟结果对比表明：上海环球金融中心变形计算应考虑施工过程和徐变效应的影响；计算结果与实测结果吻合较好，证明了建议方法的可行性。图12表3参12

Analysis of vertical deformation during construction of the Shanghai World Financial Center

Shanghai World Financial Center is one of the highest buildings of the world, of which the cumulation of vertical deformation during construction is significant and worth investigating. A refined finite element model was developed to conduct full-process analysis of construction of super high-rise buildings like Shanghai World Financial Center, in which the discrete analysis method of time-varying structures and the age-adjusted effective modulus method were both used. In the finite element analysis, the whole construction process was divided into a series of stages, each with a structural system that was part of the whole structure and with different material parameters, geometrical parameters, loading and boundary conditions. The whole construction process of the Shanghai World Financial Center in consideration of creep of concrete was simulated successfully using the finite element model and the analytical method developed. With respect to different construction stage, the total vertical deformation, inter-floor compression deformation and the relative deformation between the outer frame and the core-wall were obtained through the analysis. Comparison of the results form analysis of the stage-wise full-process of construction with and without considering the creep and the results from the conventional analysis of the whole building under the total load from all self-weight and construction applied to the structure ‘in one go’ shows that, the cumulative effect on the deformation from the construction process and the creep effect need to be considered in analyzing the deformation of the Shanghai World Financial Center, and the super high-rise buildings suchlike. Finally, the calculated results correlate well with the monitoring results.