摘要
在多高层框架-支撑结构中,支撑体系通常有剪切型、弯曲型和弯剪型之分,三类支撑之间没有一个定量的区分准则。本文在变截面、变轴力弯剪型支撑柱稳定分析的基础上,提出了三类支撑的定量划分准则。对弯剪型支撑-框架结构的稳定性进行了研究,得到了使被支撑框架发生无侧移弹性失稳的支撑临界刚度的简单式,它可以作为结构稳定性设计中判定框架失稳模式的标准。同时给出了支撑刚度较小时框架临界荷载于支撑刚度的简单关系,可用于弱支撑框架的稳定性计算。研究结果对于高层、超高层建筑结构的稳定计算具有重要意义。
In dual systems of multistory buildings, bracings may be claggified as flexural ,shear and shear-flexural types. Based on a stability analysis of Timoshenko' columns, a quantitative criterion is proposed for classifying the three types of bracings. Stability analysis is carried out for the frame with shear-flexural typ e of braceing. The threshold stiffness for the bracing,taken as the minimum stiffness for the frames to buckle in a non-swayx mode, is obtained,and it can be emptoyad to judge the buckling mode of frames (sway or non-sway buckling). A simple relation ship be tween the frame critical load and the brace stiffness is also presented when the braces are not strong enough to make the frames buckle i n a non-sway mode.
出处
《土木工程学报》
EI
CSCD
北大核心
2005年第5期28-33,共6页
China Civil Engineering Journal
关键词
框架
稳定性
支撑
弯剪型
临界刚度
frame
stability
brace
shear-flexural type
critical stiffness
