摘要
为了研究相互作用下圆形钢管混凝土(circular concrete-filled steel tube,CCFST)柱中钢管和混凝土各自的承载力贡献,通过ABAQUS软件中的VUMAT子程序导入一种新的混凝土材料本构,建立了能够反映CCFST柱中钢管和混凝土相互作用的三维有限元模型,并通过试验数据验证了模型的荷载-位移曲线、钢管和混凝土的荷载-变形曲线以及侧向变形曲线。在此基础上分析了混凝土强度、钢管屈服强度、径厚比以及套箍系数对CCFST柱承载力及其组成的影响。然后结合有限元模型推导了CCFST柱在轴压荷载下峰值承载力的数学模型,模型中提出的钢管环向应力比例系数和混凝土承载力贡献系数可以评估钢管和混凝土的受力状态。将计算模型与现行规范及现有研究进行对比,发现提出的计算公式具有良好的计算精度,且可以评估钢管和混凝土各自的承载力贡献。
A novel constitutive model for concrete material was incorporated into the VUMAT subroutine of ABAQUS to investigate the respective bearing capacity contributions of the steel tube and concrete in circular concrete-filled steel tubular(CCFST)columns under interaction.A three-dimensional finite element model was established to reflect the interaction between the steel tube and concrete in CCFST columns,and the model was validated against experimental data for load-displacement curves,load-deformation curves of the steel tube and concrete,and lateral deformation curves.Based on the established models,the influence of concrete strength,steel yield strength,diameter-to-thickness ratio,and confinement coefficient on the bearing capacity and its composition of CCFST columns was analyzed.Subsequently,a mathematical model for the peak bearing capacity of CCFST columns under axial compressive load was derived using the finite element models.To evaluate the stress state of the steel tube and concrete,the proposed proportional coefficient of circumferential stress in the steel tube and the contribution coefficient of concrete strength were introduced.The proposed formula was compared to current specifications and existing research to verify its accuracy and capability to evaluate the bearing capacity contributions of the steel tube and concrete.
作者
陈立康
黄远
CHEN Likang;HUANG Yuan(College of Civil Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Key Laboratory on Damage Diagnosis for Engineering Structures,Hunan University,Changsha 410082,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2024年第6期94-104,共11页
Progress in Steel Building Structures
基金
湖南省自然科学基金(2020JJ2003)。
关键词
圆形钢管混凝土柱
相互作用
约束作用
有限元法
轴压承载力
circular concrete-filled steel tube(CFST)column
interaction
confinement effect
finite element method
axial compressive bearing capacity
