腾讯滨海大厦竖向构件收缩徐变分析

Tencent Seafront Tower: shrinkage and creep analysis of vertical members

混凝土结构的收缩徐变贯穿于结构全生命周期,对结构竖向构件产生变形差异,在超高层中引起的次内力效应与荷载效应相当。采用修正后的B3模型对腾讯滨海大厦的竖向构件进行楼层施工前、楼层施工后、连接体提升后、正常使用阶段的收缩徐变分析,获得各构件的变形幅值。对高区连接体桁架层竖向构件的变形差异引起的次内力进行分析。结果表明,构件收缩徐变变形量与荷载作用下弹性变形量相当;徐变变形差异对连接体桁架斜腹杆影响大,产生的效应大于荷载作用,需要准确设定延迟斜腹杆的连接时间。

Shrinkage and creep of concrete structure run through the full life cycle of structure,which causes the difference of deformation between vertical members of structure. The secondary internal force effect in super high-rise building is equivalent to the load effect. The revised B3 model was used to analyze the shrinkage and creep of vertical members of Tencent Seafront Tower before floor construction,after floor construction,after joint lifting and during normal use,and the deformation amplitude of each member was obtained. Secondary internal forces caused by deformation differences of vertical members of connected truss floors in high regions were analyzed. The results show that the shrinkage and creep deformation of the member is equivalent to the elastic deformation under load. The difference of creep deformation has great influence on the oblique web members of the connected truss,and the effect is greater than the load effect. It is necessary to set the connection time of the delayed oblique web members accurately.