带加强层框架-核心筒结构中单伸臂桁架刚度比的合理取值

推导带加强层框架-核心筒结构顶层位移的简化计算公式,提取影响结构顶层位移的刚度比特征参数:伸臂弯曲刚度比i、伸臂剪切刚度比g、外框架柱弯曲刚度比p。采用ETABS软件建立一253.2 m超高层结构模型,研究水平均布荷载和地震作用下结构的侧移、内力与i、g、p的相互关系。研究结果表明,采用刚度比特征参数i、g、p对结构侧向刚度进行优化是合理可行的,p对结构侧向刚度影响最大,其次是g,最小是i,其中i的取值不宜超过0.6,g的取值宜控制在0.9～3.5区段之间,p的取值宜控制在1.3～4.6区段之间。

Rational stiffness of single outrigger trusses in frame-core structure with outriggers

The characteristic parameters of bending stiffness ratio i, shearing stiffness ratio g of outrigger trusses and bending stiffness ratio p of column were investigated in order to get the simplified calculation formula of structural roof displacement in frame-core structure with outriggers. The relationships among the structural roof displacement, internal forces and i, g, p under uniformly distributed loading and earthquake loading were studied through a 253.2-meter super-rise building using the software ETABS. The results show that i, g, p adopted for optimizing the structural lateral stiffness are reasonable and feasible, and p has the greatest influence on the structural lateral stiffness while the second is g and i has the smallest effect. As for the characteristic parameters, i should not be bigger than 0.6, g should be 0.9～3.5, and p should be 1.3～4.6.