摘要
为研究椭圆钢管混凝土短柱在循环轴压下的力学性能,本文对18个椭圆钢管混凝土短柱分别进行了单调轴压和循环轴压试验,试验中的主要参数为椭圆截面比、混凝土强度和加载制度。结果表明:椭圆截面比对椭圆钢管和混凝土之间的约束效应影响显著,对延性影响不大;混凝土强度的提高对钢管和混凝土之间的约束效应以及试件的延性都有不利影响;循环加卸载会导致椭圆钢管混凝土的强度衰减和残余变形的累积。试验结果与国内外学者和相关规范给出的设计公式计算结果比较发现,这些设计公式均可用于计算椭圆钢管混凝土短柱的轴压承载力。研究成果为椭圆钢管混凝土的理论研究和工程应用提供了试验依据。
To study the cyclic axial compression behavior of concrete-filled elliptical steel tubular columns,18 stub columns were tested under monotonic and cyclic axial compression.The parameters in the study include the elliptical section ratio,concrete strength,and loading system.The experimental result indicates that the elliptical section ratio had a significant impact on the confinement effect between the steel tube and concrete but an insignificant effect on ductility.The increase in concrete strength had a negative impact on both the ductility of specimens and the confinement effect between the steel tube and concrete.Cyclic loading will result in strength degradation and residual deformation accumulation.The design rules based on standard and researchers at home and abroad were also assessed and compared with the experimental result.It was found that these design equations can give a reasonable prediction of the axial compressive bearing capacity of elliptical concrete-filled steel tube stub columns.The study could provide a reference for theoretical research and practical application of elliptical concrete-filled steel tubular(ECFST)columns.
作者
许友武
姚谏
李忠学
XU Youwu;YAO Jian;LI Zhongxue(Institute of Structural Engineering, Zhejiang University, Hangzhou 310058 China;College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2020年第5期635-642,共8页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(11672266)
江省自然科学基金项目(LY18E080014)。
关键词
椭圆钢管混凝土柱
单调轴压
循环轴压
约束效应
延性
轴压承载力
elliptical concrete-filled steel tubular column
monotonic axial compression
cyclic axial compression
confinement effect
ductility
axial compressive bearing capacity
