钢框架—钢筋混凝土核心筒体系竖向变形差异补偿对结构性能的影响

Influence of the vertical deformation compensation of corewall systems on the characteristics of steel frame-reinforced concrete structures

经过多种补偿方案的比较,提出钢框架-钢筋混凝土核心筒体系竖向变形差异的楼层组优化补偿方案,并研究竖向变形差异补偿对结构的内力和变形的影响。利用有限元程序SAP2000进行结构分析,在分析中分层施加竖向荷载,考虑混凝土收缩和徐变的影响。分析表明,钢框架-钢筋混凝土核心筒体系竖向变形差异楼层组优化补偿方案,既能保证补偿的精度,又经过优化使施工更为方便,是一种比较合理的补偿方案。采用楼层组优化补偿方案可以使楼层的最大累积变形差异明显减小,保证水平构件的水平度。在补偿结构中,只有位于平面四角处的连系梁内力减小较多,其他梁或柱的内力变化很小。与原结构类似,在补偿结构中,钢框架柱之间的竖向变形差异远远小于柱-筒之间的竖向变形差异。

After comparing different structural compensation schemes, an optimal scheme is presented for compensating the differential deformations between columns and corewall of steel frame-reinforced concrete corewall structures, and its effects on the internal force and the deformation of the structure are also discussed. The SAP2000 software is employed to calculate the differential deformations, including the effects of concrete creep and shrinkage. Gravity loads are applied to the whole structure, floor by floor, based on the superposition principle. The study points out that an optimal compensation scheme can indeed not only ensure the compensation precision, but also facilitate the construction process. When optimal compensation scheme is adopted, the maximum accumulating differential deformations between columns and corewall can be reduced sharply, thus ensuring the beams and plates to remain horizontal. In the compensated structure, the changes of internal forces of all steel beams and columns are relatively small, except the coupling and secondary beams at the corners. Similar to the original structure, the differential deformations between columns are far smaller than those between columns and corewall in the compensated structure.