考虑时变效应的超高层竖向构件差异变形补偿方法

Compensation Method of Differential Deformation for Vertical Members of Super High-rise Buildings Considering Time-dependent Effects

摘要:

针对超高层建筑竖向构件的差异变形问题，考虑混凝土收缩徐变效应和施工过程的影响，提出可控制竖向构件差异变形的同步分组补偿方法，该方法通过设置标高差容许值对框架柱与核心筒构件进行同步分组补偿，可降低竖向构件自身的标高差和相互之间的相对标高差。同时，将提出的分组补偿方法应用于天津117大厦的标高补偿中，研究结果表明：建筑封顶时，框架柱与核心筒在长期收缩徐变效应下产生的竖向变形超过总变形的30%，且随时间的增加而增加；通过同步分组补偿法可将竖向构件自身的标高差和相互之间的相对标高差控制在容许值之内，能有效降低由于时变效应差异而引起的构件附加内力。

Abstract:

Aiming to reduce the differential deformations between frame columns and core tubes in super high-rise buildings， a synchronous grouping compensation method is proposed， which considers the time-dependent effects of concrete and the influence of construction process. In this method， frame columns and core tubes are synchronized grouped and compensated by setting the allowable value of the elevation difference. In addition， the proposed grouping compensation method is applied to the elevation compensation of the Tianjin Building 117 The analytical results show that the vertical deformation of frame columns and core tubes under the effect of long-term shrinkage and creep exceeds 30% of the total deformation， and the proportion increases with time. Besides， the proposed method can limit the elevation difference of the vertical components themselves and their relative elevation difference within the allowable value， which can effectively reduce the additional internal force of the components caused by the time dependent effects.