建筑钢结构进展2024，Vol.26Issue(8)：1-10,10.DOI:10.13969/j.cnki.cn31-1893.2024.08.001
钢管高强再生混凝土叠合柱偏压性能
Eccentric Compression Behavior of High-Strength Recycled Concrete-Encased Concrete Filled Steel Tubular Columns
摘要
Abstract
In order to study the eccentric compression performance of high-strength concrete-encased concrete filled steel tubular columns(CCFSTC),six specimens were subjected to eccentric compression tests.Concrete type and eccentricity were taken as the parameters,and the effects of different parameters on the damage development process,failure characteristics,bearing capacity and ductility of the CCFSTC were studied.The eccentric compression capacity of 16 CCFSTC was calculated based on the Technical Specification for Steel Tube-Reinforced Concrete Column Structures and the formulas proposed by other studies.The results show that recycled CCFSTC and natural CCFSTC exhibit three stages of elasticity,working with cracks and failure during the whole loading process.The final failure patterns of the columns are crushing and detachment of the outer concrete cover,longitudinal reinforcement bulging,and hoop bulging.Compared with natural CCFSTC,the initial stiffness and deformation capacity of the recycled CCFSTC reduces,while the bearing capacity improves slightly.With the increase of eccentricity,the initial stiffness and bearing capacity of the composite column decrease rapidly.The neutral axis gradually moves towards the compression zone,and the assumed consistency of the plane section decreases.On the contrary,the displacement ductility coefficient increases rapidly with the increased eccentricity.The calculation of the eccentric compression capacity of the CCFSTC should account for the bearing capacity of steel tube and the constraint effect of concrete core.关键词
钢管混凝土叠合柱/高强再生混凝土/偏压性能/承载力计算Key words
concrete-encased concrete filled steel tubular column/high-strength recycled concrete/eccentric compression behavior/bearing capacity calculation分类
建筑与水利引用本文复制引用
牛海成,尚天宇,李博涵,黄明晖..钢管高强再生混凝土叠合柱偏压性能[J].建筑钢结构进展,2024,26(8):1-10,10.基金项目
国家自然科学基金联合基金项目(U1904188),河南省重点研发与推广专项(科技攻关)项目(232102320085),河南省高等学校重点科研项目(23B560004) （U1904188）
