摘要
钢管混凝土FRP混凝土(SCFC)组合柱是新近提出的一种新型组合柱形式。提出考虑外钢管与FRP的双重约束效果,采用双剪统一理论分析了SCFC组合柱外钢管、外层混凝土、FRP管以及内层混凝土的应力状态,根据静力平衡条件得到了SCFC组合柱的轴压承载力计算公式,其与试验结果能够较好吻合。分析了含钢率、FRP与钢的相对配置率、FRP径厚比以及FRP管直径对轴压承载力提高系数的影响,结果表明:随着含钢率的增加、FRP与钢的相对配置率的提高以及FRP径厚比的减小,SCFC组合柱轴压承载力提高系数都有一定程度提高;内FRP管直径与外钢管边长之比在0.65~0.75之间时,轴压承载力增益效果较好。
The sectional form of steel-concrete-FRP-concrete has a steel tube as the outer layer and a circular FRP tube （SCFC） column, as a novel composite column, as the inner layer, and concrete filled between these two layers and within the FRP tube. Considering the confinements from both outer steel and inner FRP layers, the twin shear unified strength theory and force equilibrium condition are utilized to develop an analytical model of bearing capacity of SCFC column. The accuracy of the proposed model is evidenced through being compared with experimental data. The parametrical study is conducted in order to evaluate the confinements affected by the sectional steel proportion, ratio of FRP to steel, ratio of diameter to thickness of FRP and FRP diameter itself. The results indicate that the greater sectional steel proportion, the larger ratio of FRP to steel, and smaller ratio of diameter to thickness of FRP have positivecontributions on the confinements of SCFC. The ratio of FRP diameter to steel side length locates between 0.65-0.75 can lead to a better confinement.
出处
《土木建筑与环境工程》
CSCD
北大核心
2017年第2期43-49,共7页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金(51408478)
陕西省自然科学基础研究计划(2014JQ2-5024)
陕西省教育厅专项科研计划(14KJ1437)~~
关键词
组合柱
双剪统一强度理论
承载力
应力
composite column
twin shear unified strength theory
bearing capacity
stress
