摘要
变截面钢管混凝土格构柱的轴压试验结果表明,随着试件高度的增大和柱肢坡度的减小,其极限荷载逐渐降低。基于上述规律,在等截面钢管混凝土格构柱计算框架的基础上,研究了变截面钢管混凝土格构柱轴压极限承载力的计算方法。提出变截面钢管混凝土格构柱等效长度的概念和等效长度法的计算公式,其承载力计算结果与试验结果吻合良好。最后在有限元数值分析验证的基础上,给出适合工程应用的四肢变截面钢管混凝土格构柱轴压极限承载力的实用算法,为钢管混凝土设计规程的进一步完善提供参考。
Test results of variable cross-sectional concrete filled steel tubular（CFST）laced columns on axial load indicate that the ultimate load of specimens reduces gradually with the increase of column length and the decrease of slope of longitudinal elements.Following this rule,a calculation method of the ultimate load carrying capacity of CFST variable cross-sectional laced columns on axial load was studied on the base of calculation frame of equal cross-sectional CFST laced columns.A method by using equivalent length to calculate equivalent slenderness ratio and stability factor of variable cross-sectional CFST laced columns was presented.The calculation results of specimens＇ ultimate load by this method are coincident well with the test results.Finally,a rational and applied method to calculate the ultimate load carrying capacity of four-element variable cross-sectional CFST laced columns was presented on the base of numerical results from FEM analysis,and it＇s hoped to provide reference for the further perfection of CFST design criteria.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第5期114-120,共7页
Journal of Chongqing University
基金
国家自然科学基金资助项目(51408128
51178118)~~
关键词
变截面
钢管混凝土
格构柱
轴压
极限承载力
计算方法
variable cross-sectional
concrete-filled steel tube（CFST）
laced column
axial load
ultimate load carrying capacity
calculation method
