超高层混合结构考虑施工过程的竖向变形差异计算和分析

Vertical Deformation Difference Analysis of Super High-rise Hybrid Structures Considering Construction Process

分析了混合结构体系超高层建筑在施工期间和使用阶段的竖向变形问题。采用CEB-FIP(1990)规范中混凝土收缩/徐变模型,计算了钢管混凝土柱和钢筋混凝土核心筒间的竖向变形差异,并分析了竖向变形差对关键构件内力的影响。计算中考虑了筒体先于外框柱施工、混凝土材料的收缩徐变、施工过程找平调整等因素的影响。结果表明,结构封顶一年后外框柱和核心筒最大竖向变形分别为50 mm(51层)和55 mm(51层),最大竖向变形差为12.9 mm(68层),同时由于竖向变形差引起的伸臂桁架次内力增量较小,结构具有足够的安全度。

In the paper, the vertical deformation of a super high-rise structure during construction and service was analyzed. According to concrete creep and shrinkage provisions in CEB-FIP Code, the vertical deforma- tion difference between CFT column and reinforced concrete core wall was calculated ; and the influence of de- formation on the inner force of key members was estimated. The factors such as construction sequence, creep and shrinkage of concrete, and construction adjustment were considered in the calculation. The results show that the maximum vertical deformation of composite columns was 50 mm on the 51th floor, while that of rein- forced concrete core wall was 55 mm on the 51th floor. The maximum vertical deformation difference reaches 12. 9ram on the 68th floor, one year after the completion of the main structure. Additional internal forces of outrig- ger, caused by the vertical deformation difference are small and the structure has enough safety redundancy.