基于层间扭转角的高层建筑扭转分析

Analysis of Torsion for Tall Buildings Based on Inter-story Torsion Angle

高层建筑发展迅速,地震作用下高层建筑扭转问题现象明显。目前规范只给出了位移比、周期比的定义,并不能完全控制由结构扭转角产生的不利影响。用公式推导出扭转角参考值,同时用有限元方法建立3个分析模型,通过改变结构刚度布置,对比分析层间扭转角及楼层位移的变化规律,提出在规范中增加层间扭转角作为结构扭转控制指标的建议。

High-rise building is developed rapidly and the problem of high-rise building＇s torsion is obvious when earthquake occurs.The current standard specification only gives the definition of displacement ratio and period ratio,and can＇t fully control the adverse impact by the structural torsion angle.Formula is used to deduce torsion angle of reference.At the same time,finite element method is used to establish three analysis models.Layer between the torsion angle and displacement of the floor by changing the structure rigidity arrangement are analyzed.Finally aproposal is put forward that adding the interlaminar torsion angle as the control index of the structure of reverse in specification.