建筑结构学报2017，Vol.38Issue(7)：78-84,7.DOI:10.14006/j.jzjgxb.2017.07.010
复式薄壁方钢管混凝土构件受弯性能研究
Flexural behavior of composite concrete-filled square thin-walled steel tubular specimens
摘要
Abstract
The tests of composite concrete-filled square thin-walled steel tubular (CCSTWST) specimens under bending load were carried out.The effects of embedding hollow circular steel tube and embedding high-strength concrete filled circular steel tube on the bending behavior of the pure bending segment of the CCSTWST specimen were investigated.The test results indicate that embedding hollow circular steel tube and embedding high-strength concretefilled circular steel tube can significantly enhance its flexural resistance,and the effect of the later is more obvious.The strength and stiffness of a square CCSTWST is obviously higher than the pure steel tubular counterpart.During the whole testing process,no failure at the corner of the outer steel tube can be found.The FE analysis of the flexural behavior of composite CCSTWST beams were then conducted.The predicted results agreed well with the measured results.The compressive strength of the sandwiched concrete at the comer was effectively increased due to the confinement of the outer steel tube.The parameteric analysis indicates that the flexural resistance and stiffness of CCSTWST specimens are increased with the increase of the sandwiched concrete strength and the ratio of diameter to width.However,the flexural resistance and stiffness are decreased with the increase of the ratio of diameter to thickness.And the flexural resistance of CCSTWST specimens is increased with the increase of the steel yield strength.Finally,the simplified models were proposed to calculate flexural resistances of CCSTWST specimens with a hollow section or a solid section,which have a high accuracy.关键词
复式薄壁方钢管混凝土/纵向加劲肋/中空截面/静力试验/有限元分析/受弯承载力Key words
composite concrete-filled square thin-walled steel tube/longitudinal stiffness/hollow section/static test/FEA/flexural resistance分类
建筑与水利引用本文复制引用
王志滨,张万安,池思源,李永进..复式薄壁方钢管混凝土构件受弯性能研究[J].建筑结构学报,2017,38(7):78-84,7.基金项目
国家自然科学基金项目(51308124,51308121). （51308124,51308121）
