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

作　　者：牛海成[1] 尚天宇 李博涵 黄明晖 NIU Haicheng;SHANG Tianyu;LI Bohan;HUANG Minghui(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454003

出　　处：《建筑钢结构进展》2024年第8期1-10,共10页Progress in Steel Building Structures

基　　金：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)。

摘　　要：为研究钢管高强混凝土叠合柱偏心受压性能,以混凝土类型和偏心距为参数,完成了6根叠合柱偏心受压试验,研究了不同参数对钢管高强混凝土叠合柱损伤发展过程、破坏特征、承载力和延性的影响,并基于《钢管混凝土叠合柱结构技术规程》(T/CECS 188—2019)和相关学者提出的公式对16根钢管混凝土叠合柱的偏压承载力进行了计算。研究结果表明:再生混凝土叠合柱与普通混凝土叠合柱的受力过程均经历了弹性、带裂缝工作和破坏3个阶段,表现出外围混凝土保护层被压碎脱落、纵筋鼓曲和箍筋外鼓等破坏特征;与普通混凝土叠合柱相比,再生混凝土叠合柱的初始刚度和变形能力有所降低,但承载力略高;随着偏心距的增加,钢管混凝土叠合柱的初始刚度和承载力迅速降低,而位移延性系数迅速增大,中和轴逐渐向受压区移动,与平截面假定的吻合度有所降低;钢管混凝土叠合柱偏压承载力计算应考虑钢管自身承载力以及钢管对核心混凝土约束效应的影响。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 

分 类 号：TU398.9[建筑科学—结构工程]