摘要
为了对薄壁钢管混凝土轴压短柱在外部钢管屈曲后仍能达到较高极限承载力的试验现象与有限元分析结果进行理论解释,通过薄板的大小挠度理论,推导出计算四边夹支和两边夹支两边简支钢板屈曲后受力性能的公式;得到管壁屈曲后对内部混凝土产生的主动约束力,进而利用约束混凝土模型求得钢管中受约束混凝土极限压应力值;从理论上解析了薄壁钢管混凝土柱在外部钢管屈曲后仍能达到较高极限承载力的机理,给进一步的薄壁钢管混凝土柱理论分析研究提供了依据。
In order to explain the phenomenon that the square concrete-filled thin-walled steel tube （CFTST） stub column under axial loading can also reach higher ultimate load capability after its outside steel tube has been buckled, the formula to research the postbuckling mechanical capability of clamed steel plates are deduced by using the small and large deflection theories, the active confined force inside concrete caused by the outside post-local buckling steel plate is then obtained, thusly the ultimate compressive stress of concrete inside CFTST stub columns can figured out by the confined concrete model, the reason that CFTST stub column under axial loading can reach higher ultimate load capability after its outside steel tube has been buckled is explained, it is very useful for the further theoretical analysis.
出处
《工程力学》
EI
CSCD
北大核心
2012年第9期157-165,176,共10页
Engineering Mechanics
基金
中国建筑股份有限公司科研创新计划项目(CSCEC-2008-Z-29)
关键词
薄壁钢管混凝土
轴压短柱
极限承载力
屈曲后
约束混凝土
concrete-filled thin-walled steel tube
stub column under axial loading
ultimate load capability
postbuckling
confined concrete
