摘要
传统的计算长度系数法计算框架稳定时不能考虑同层柱之间的支援作用以及层与层之间的支援作用,有可能会造成不合理的设计。利用等效负刚度的概念,定义了可用于表征层刚度富余程度的层刚轴比系数以及表征层间支援程度的层支援系数,通过层刚轴比系数可以方便的确定框架的薄弱层以及各层之间的相互支援关系,推导了可直接计算有侧移框架整体弹性稳定承载力的简单实用的计算公式。该公式可很好的考虑同层柱之间的支援作用以及层与层之间的支援作用,避免了有限元屈曲分析。通过弹性稳定承载力可进一步反算柱的计算长度系数用于构件校核。算例计算结果表明:该方法具有很好的精度和准确性,计算结果稍偏安全,可供工程设计及理论计算使用。
The effective length method may lead to unsafe design for neglecting the interaction of columns at the same story and the inter-story interaction.Using the concept of equivalent negative stiffness,the story stiffness to negative stiffness ratio and story support factor were proposed.Through the story stiffness to negative stiffness ratio,the weak-story and the inter-story support relationship could be found.Then,a formula for calculating the elastic stability capacity of sway frame was proposed,by which the interaction of columns at the same story and inter-story interaction could be considered and the finite element buckling analysis for stability capacity could be avoided.Through the stability capacity,the column effective length could be calculated.The results show that this simple calculation method has good precision and accuracy.It can be used for engineering design and theoretical calculations.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2011年第11期183-188,共6页
Journal of Building Structures
基金
国家自然科学基金项目(50878181
51108369)
高等学校博士学科点专项科研基金(20096120110004)
陕西省自然科学基金青年基金(2010JQ7001)
关键词
有侧移框架
计算方法
负刚度
整体稳定
sway frame
calculation method
negative stiffness
overall stability
