摘要
目的研究GFRP管约束钢骨混凝土组合短柱在轴压荷载作用下的破坏模式和轴压力学性能,以指导工程实际.方法对7根GFRP管约束钢骨混凝土组合短柱进行轴压试验,研究混凝土强度等级、截面含钢率和截面组合形式对组合短柱的破坏模式和轴压力学性能的影响,得到其荷载位移曲线;采用纤维模型法预测荷载轴向应变曲线.结果短柱内部混凝土均呈45°斜剪切破坏,柱脚钢管发生鼓曲;相同含钢率下,内置工字钢短柱比内置钢管短柱破坏更严重,极限承载力更低;短柱的荷载-位移曲线都呈双线性上升,内置钢管使短柱极限承载能力提升1.44~1.96倍,增大钢管截面尺寸对短柱极限承载力的提升效果最明显.结论内置钢管能更有效提高短柱的极限承载力,采用纤维模型法预测荷载轴向应变曲线时,引入环向极限约束面积比系数ξ,使极限承载力预测误差在5%以内,可为GFRP管约束钢骨混凝土组合构件的非线性分析提供参考.
In order to study the failure mode and mechanical properties of steel-encased concrete filled GFRP tubular short columns under axial load,seven combined short column axial compression tests are carried out.The effects of concrete strength grade,section steel content and section form on the axial compression properties of steel-encased concrete filled GFRP tubular short columns were studied.The load-displacement curve is obtained,and the load-axial strain curve is predicted by the fiber model method.The results show that the concrete inside the short column shows 45°shear failure,and the steel tube at the column base is deformed.Under the section steel ratio,the built-in I-steel short column is more severely damaged than the built-in steel tube short column,and the ultimate bearing capacity is lower.The load-displacement curve of the short column increases bi-linearly.The built-in steel pipe increases the ultimate bearing capacity of the short column by 1.44~1.96 times.The increase of the cross-section of the steel tube has the most obvious effect on the ultimate bearing capacity of the short column.When the fiber model method is used to predict the load axial strain curve,the introduction of the hoop limit constraint area ratio coefficientξcan make the ultimate bearing capacity prediction error within 5%,which can provide reference for the nonlinear analysis of steel-encased concrete filled GFRP tubular members.
作者
杨文伟
李顺涛
杨霞
YANG Wenwei;LI Shuntao;YANG Xia(College of Civil and Hydraulic Engineering,Ningxia University,Yinchuan,China,750021)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第2期229-238,共10页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51468054)
宁夏回族自治区自然科学基金项目(2019AAC03004)。
关键词
GFRP管混凝土柱
钢骨
轴压力学性能
纤维模型法
非线性分析
concrete filled GFRP tubular columns
steel
axial compression performance
fiber model method
nonlinear analysis
