低高宽比筒中筒结构分析与设计建议  

Structural Analysis and Design Recommendations for Tube-in-tube Structures with a Low Height-width Ratio

作　　者：马凯[1] 唐绍雪 

机构地区：[1]北京市建筑设计研究院有限公司,北京100045

出　　处：《结构工程师》2016年第2期29-33,共5页Structural Engineers

摘　　要：以某实际工程为例对较低高宽比的筒中筒结构的特点进行了分析,并通过改变结构高度,根据结构楼层位移曲线,基底剪力与倾覆弯矩在内外框中的分配以及柱轴力变化曲线,探讨了高宽比对筒中筒结构受力的影响。结果表明,低高宽比的筒中筒结构弯曲效应较小,外筒空间作用不明显,剪力滞后严重。建议该类结构设计时应进行内筒加强,并尽量做到外框的强柱弱梁,条件允许时可采用装饰柱代替部分结构柱。This paper presents a study on the mechanical features of tube-in-tube structures with a low height- width ratio. Taking a practical project as an example,by changing the height of the structures,the influence of the height-width ratio on tube-in-tube structures was discussed. The floor displacement curve, the distribution of base shear and overturning moment between inner tube and outer tube and the changes of column axial force was carried out. It turns out that, bending effect is small in tube-in-tube structures with low height-width ratio and spatial action is not obvious as well. Besides, the shear lag effect of stress distribution is more serious. It is recommended that the corner of the inner tube should be strengthened, and the strong column and weak beams should be realized as much as possible during designing this kind of structures. It is suggested to change partial structural columns into decorative ones.

关 键 词：筒中筒结构 高宽比 基底剪力 倾覆弯矩 剪力滞后 

分 类 号：TU973.17[建筑科学—结构工程]