内筒偏置框架-核心筒结构扭转效应控制方法研究

Study on Torsional Response Control Method of Eccentric Frame-core Wall Structures

内筒偏置将加剧框架-核心筒结构在地震作用下的扭转反应。研究了内筒偏置框架-核心筒结构的扭转效应控制方法。根据内筒偏置框架-核心筒结构的刚度分布特点,通过减小核心筒内墙厚度,调整核心筒外墙厚度以及核心筒外墙开洞等方法,可有效减小结构的扭转位移比。上述三种方法对结构扭转反应的控制程度由弱到强。需要注意的是,尽管外墙开洞可以从根本上解决内筒偏置框架-核心筒结构扭转位移比过大的问题,但是会引起结构周期比的较大波动,一般说来,洞口尺寸不宜过大。

Due to eccentric layout of corewall,torsional response of frame corewall structures under earthquake can increase significantly.Therefore,how to control the torsional response was studied in this paper.According to the stiffness distribution features of an eccentric frame corewall structure,the torsional displacement ratio could be decreased apparently through cutting down the thickness of the interior walls,changing the thickness of the exterior walls and opening holes in the exterior walls.The control effects of the three methods are from weak to strong gradually.However,opening holes in the exterior walls could induce a dramatic fluctuation of the structural period ratio,although it could profoundly resolve the problem of large torsional displacement in the eccentric frame corewall structure.Normally,the size of the hole should not be too large.