钢框架-钢筋混凝土核心筒体系竖向变形差异的计算

本文研究了钢框架-钢筋混凝土核心简体系在重力荷载下,框架柱与混凝土简体的竖向变形差异问题,在分析中考 虑了混凝土的收缩和徐变以及建筑物室内外温差的影响。采用在整体结构计算模型上分层施加竖向荷载的叠加方法,利 用有限元程序SAP2000进行计算。分析表明,在仅考虑重力荷载和筒体混凝土的收缩和徐变时,高度在150m以上的钢框 架.钢筋混凝土核心简体系平均每3个楼层需要找平2mm以上。此外,混凝土的收缩和徐变以及建筑物室内外温差对框 架柱的轴力有相当大的影响,三者影响的总和占重力荷载作用下钢柱轴力的3％-20％之间。连系梁与框架柱刚接或铰 接,对柱筒竖向变形差异的影响较小,但是对节点的内力影响较大。采用钢管混凝土柱将大大减小柱筒之间的竖向变形差 异。

Calculation of the differential shortening of steel frame-reinforced concrete core-wall structure

Taking the concrete creep and shrinkage of core-wall and the temperature difference between inside and outside of the structure into account, the differential shortening between columns and core-wall of the steel frame-reinforced concrete core-wall structure subjected to gravity loads is analyzed in this paper. The gravity loads are applied to the structural calculating model floor by floor to simulate the construction process, and the program SAP2000 is used to calculate the differential shortening according to the superposition principle. When only the concrete creep and shrinkage are considered and the gravity loads are applied, the concrete leveling for the differential shortening between columns and core-wall of the steel frame-reinforced concrete core-wall structure higher than 150m is more than 2mm per 3-floor. The total influence of the concrete creep and shrinkage and the temperature difference between inside and outside of the structure on axial forces of frame columns is considerable and the sum of the effects of the above-mentioned three factors on the axial forces of steel column will equal to 3% -20% of that caused by gravity load. The joint patterns between coupling beams and frame columns has little effect on the differential shortening between columns and core-wall, but causes rather great effect on the internal force of the joint. The adoption of concrete-filled steel tube columns will significantly decrease the differential shortening between columns and core-wall.