高层框筒和筒中筒结构动力特性的简化分析

Simplified Analysis of Dynamic Behaviors of Tall Framed-tube and Tube-in-tube Structures

用连续 -离散化方法分析高层建筑筒体结构的动力特性 .在导出的等效筒体层间段单元的刚度矩阵中 ,所采用的位移函数能反映筒体结构的剪力滞后效应 .采用筒体的这种等效单元和刚性楼面及结构质量集中于楼面的假定 ,可使筒体结构的动力特性分析大大简化 .与有限单元法比较 ,具有计算简捷和应用方便的优点 .计算表明 。

A discretized method of an equivalent continuum is used for analysis of dynamic behaviors of tall building tubular structures.A stiffness matrix of equivalent tubular element between two neighbouring floors is developed and the displacement functions chosen conform with the effect of shear lag on the tube.Using this kind of equivalent tubular element,assuming rigid floor and concentrating mass at every floor of the structure,analysis of dynamic behaviours of the tubular structure can be simplified considerably.As compared with the finite element method,this one is somewhat forthright and convenient.Numerical examples show that the method in this paper has the advantages of accuracy and effectiveness.