高层建筑结构抗扭设计中的几个问题  

Research on several problems in the torsional resisting design of high-rise building structures

作　　者：徐培福[1] 黄吉锋[1] 陈富盛 

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑结构》2014年第12期1-6,共6页Building Structure

摘　　要：抗扭设计是高层建筑结构设计中的重要问题。首先阐述了影响结构扭转激振和反应的主要因素及控制措施,并从"避开扭转反应的最大峰值"、"降低结构扭转反应对偏心率的敏感性"和"鉴别抗扭刚度不足的结构"三个方面,说明了控制周期比的必要性以及《高层建筑混凝土结构技术规程》(JGJ 3—2010)周期比控制方法的合理性;其次讨论了高层结构的周期比与结构高度的关系,对于弯曲型或弯剪型结构,指出"若平面布局相同,高度越大、周期比越小、相对抗扭刚度越大、扭转反应越小"的规律是成立的且合理的;最后证明了对于满足刚性楼面假定的结构,如果结构最大层间位移角和层间位移比满足高规的基本限值要求,楼层的扭转将会被控制在较小的量级,该量级的扭转可能会影响巨型截面柱的抗扭承载力设计,而对普通柱的抗扭承载力设计一般情况下则影响较小。Torsional resisting design is one of the important problems in the design of high-rise building structures. Firstly, the major factors influencing the structural torsional response and its control measures were expounded. The necessity to control the period ratio and the rationality of the period ratio control method in Technical specification for concrete structures of tall building（ JGJ 3--2010 ） were discussed in terms of avoiding the structural peak torsional response, reducing the sensitivity of structural torsional responses to mass eccentricities and identifying the structures lack of stiffness. Secondly, the relationship between the period ratio and the structural height was investigated. It was pointed out that, for the flexural or flexural-shearing mixed building structures, if the plane layout is same, it is valid and reasonable that the decreasing of the period ratio and the increasing of relative torsional stiffness would coincide with the increasing of structural height. At last, for the structures that satisfying the assumption of rigid diaphragm, it was proved that if the maximum interstorey drift and the ratio of the maximum interstorey drift to the average Value is located in the range of code limitations, the torsional deformations will be limited in a less magnitude. The torsional deformations in such magnitude may have influence on the torsional resisting strength design of the columns with mega sections and have slight influence on the torsional resisting strength design of the columns with common sections.

关 键 词：周期比 固有抗扭特性 抗扭布局合理性 扭转反应 抗扭承载力 

分 类 号：TU973[建筑科学—结构工程]