(1 西安建筑科技大学土木工程学院,西安 710055;2 西安建筑科技大学西部绿色建筑国家重点实验室,西安 710055;3 西安建筑科技大学结构工程与抗震教育部重点实验室,西安 710055)

摘要: 为提高方钢管混凝土短柱轴压承载力的计算精度和效率,收集了国内外 167 个方钢管混凝土短柱的轴压试验资料;探讨了方钢管混凝土短柱在两种不同加载方式下的破坏机理,阐明了方钢管混凝土短柱轴压极限承载力不受加载方式影响的原因;引入“约束效应”系数,分析了混凝土强度、钢管强度、钢管宽厚比(B/ t)对“约束效应”的影响;以极限平衡理论为基础,从方钢管混凝土短柱的理想轴压极限状态出发,推导了轴压承载力计算公式;考虑了方钢管对核心混凝土约束的不均匀问题,从而修正了方钢管混凝土短柱的轴压承载力计算公式.计算结果表明:该计算方法能够准确计算出方钢管混凝土短柱的轴压承载力.将该计算方法与中、美两国规范计算方法对比后发现,该方法计算结果比中国规范略微保守,较美国规范经济.该公式可以应用于 B/ t≥20 的方钢管混凝土短柱轴压承载力计算.

关键词: 方钢管混凝土短柱;轴压承载力计算;极限平衡理论;破坏机理;公式修正

中图分类号:TU398 文献标志码:A 文章编号:1002-848X(2022)18-0065-07

DOI:10.19701 / j.jzjg.20201379

Research on simplified calculation method of axial compressive bearing capacity ofconcrete-filled square steel tubular short column

MA Licheng1,SHI Qingxuan1,2,3,WANG Qiuwei1,2,3

(1 School of Civil Engineering,Xi’an University of Architecture & Technology,Xi’an 710055,China;2 State Key Laboratory of Green Building in Western China,Xi’an University of Architecture & Technology,Xi’an 710055,China;3 Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture & Technology,Xi’an 710055,China)

Abstract: To improve the calculation accuracy and efficiency of axial compressive bearing capacity of concrete-filled squaresteel tubular ( CFST) short columns,the axial compressive test data of 167 specimens of CFST short columns werecollected. The failure mechanism of CFST short columns was discussed under two different loading modes,and the reasonwas clarified why the axial compression ultimate bearing capacity of CFST short column was not affected by loading modes.The influence of concrete strength,steel tubular strength and steel tubular width thickness ratio(B/ t) on restraint effect wasanalyzed by introducing restraint effect coefficient. Based on limit equilibrium theory,the formula for calculating the axialcompressive bearing capacity was deduced from the ideal axial compression limit state of the CFST short column. Theproblem of confinement non-uniformity was considered with square steel tube to core concrete,and the formula forcalculating the axial compressive bearing capacity of CFST short column was modified. The calculation results show that themethod can accurately calculate the axial compressive bearing capacity of CFST short columns. Compared with thecalculation method of Chinese and America standard,it was found that the calculation result of the method is moreconservative than that of China and more economical than that of America. The formula could be used to calculate the axialcompressive bearing capacity of CFST short columns of B/ t≥20.

Keywords: concrete-filled square steel tubular short column;axial compressive bearing capacity calculation;limitequilibrium theory;failure mechanism;formula correction

∗国家自然科学基金面上项目(51878540,51878543),国家重点研发计划课题(2017YFC0703406).

第一作者:马立成,博士研究生,主要从事高层建筑结构及其抗震研究,Email:licheng_ma@ 163. com.

[引用本文] 马立成,史庆轩,王秋维. 方钢管混凝土短柱的轴压承载力简化计算方法研究[ J]. 建筑结构,2022,52 ( 18 ): 65-71. MA Licheng,SHI Qingxuan,WANG Qiuwei. Research on simplified calculation method of axialcompressive bearing capacity of concrete-filled square steel tubular short column[ J]. Building Structure,2022,52(18):65-71.