钢管-纤维增强复合材料管-混凝土组合柱的轴压性能和本构关系模型  

Axial Compressive Performance and Constitutive Model of CFST Columns with an Inner FRP Tube

作　　者：岳香华 龙跃凌[1] 江宇杰 李文韬 蔡健[2] YUE Xianghua;LONG Yueling;JIANG Yujie;LI Wentao;CAI Jian(Department of Civil Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]广东工业大学土木与交通工程学院,广州510006 [2]华南理工大学土木与交通学院,广州510641

出　　处：《工业建筑》2024年第6期177-189,共13页Industrial Construction

基　　金：国家自然科学基金项目(51008085);国家留学基金项目(201608440006);广东省大学生创新项目(xj2023118450337)。

摘　　要：进行了9根钢管-纤维增强复合材料(FRP)管-混凝土组合柱、1根钢管混凝土柱以及9根FRP管约束混凝土柱对比试件的轴压试验。研究表明,组合柱的极限承载力均高于钢管混凝土柱,且随FRP内管径厚比d/t_2减小或钢管与FRP内管直径比D/d减小,组合柱的极限承载力增大。随d/t_2减小,组合柱FRP内管的环、纵向峰值应变增大。随D/d的增大,组合柱FRP内管环向峰值应变增大,而D/d对其纵向峰值应变影响不大。同时,组合柱FRP内管极限环向应变均低于相应的FRP管约束混凝土柱,其极限纵向应变均高于相应的FRP管约束混凝土柱。基于上述试验研究,首次指出现有的FRP约束混凝土的本构模型中的环向-纵向应变关系不适用于钢管-FRP管-混凝土组合柱,进而提出了适合该组合柱本构关系的全新模型。9 concrete-filled steel tubular columns with an inner FRP tube(CFT-GT),1 concrete-filled steel tubular column(CFT)and 9 FRP tube confined concrete columns were tested subjected to axial compression.The results showed that the ultimate bearing capacity of CFT-GT was higher than that of CFT.With the decrease of the diameter-to-wall thickness ratios of the inner FRP tube(d/t 2)or the diameter ratios of the steel tube to the FRP tube(D/d),the ultimate bearing capacity increased.The circumferential and longitudinal peak strains of CFT-GT increased with the decrease of d/t 2.With the D/d increasing,the circumferential peak strains of the inner FRP tube of CFT-GT increased.However,D/d had little influence on the longitudinal peak strains of the inner FRP tube.In addition,it showed that all the ultimate circumferential strains of the inner FRP tube of CFT-GT were smaller than that of FRP tube confined concrete columns while the ultimate longitudinal strains of the inner FRP tube of CFT-GT was higher than that of FRP tube confined concrete column specimens.Based on the experimental study above,it was pointed out that the relations between circumferential strain and longitudinal strain in all current FRP confined concrete constitutive models were not appropriate for CFT-GT composite columns.Hence,a new constitutive model was proposed for CFT-GT composite columns.

关 键 词：钢管-FRP管-混凝土组合柱 轴压性能 本构模型 极限承载力 

分 类 号：TU398.9[建筑科学—结构工程]