摘要
为了研究螺旋筋约束不锈钢管海洋混凝土柱的轴压性能,在试验的基础上,利用ABAQUS软件建立合理的有限元模型,进行不同螺旋筋间距、纵筋直径、不锈钢管壁厚、混凝土强度和约束系数参数化分析以及不锈钢管、螺旋筋和纵筋对试件峰值荷载和弹性刚度的贡献率研究。结果表明:螺旋筋约束可以提高核心混凝土在试件峰值时的纵向应力。随着螺旋筋间距的减小,试件的初始刚度变化不大,轴压承载力增大,峰值后的变形性能显著提高;随着纵筋直径的增大,试件轴压承载力增大,但变形性能变化很小;随着不锈钢管壁厚的增大,不锈钢管对混凝土的约束作用增强,峰值后试件的荷载下降率显著减小;随着混凝土强度的增大,试件轴压承载力和初始刚度略有增大。螺旋筋对轴压承载力的贡献率最高,其次是不锈钢管和纵筋;不锈钢管对试件的弹性刚度贡献率最高,其次是纵筋和螺旋筋。随着约束系数的增加(0.72~1.08),螺旋筋约束不锈钢管海洋混凝土柱的尺寸效应减小。
In order to study the axial compression performance of marine concrete-filled stainless steel tube columns confined with spiral stirrups,a reasonable finite element model was established using ABAQUS software based on experiments.Parametric study was carried out on different spacing of spiral stirrup,diameter of longitudinal rebar,wall thickness of stainless steel tube,axial compressive strength of concrete,and constraint coefficients,as well as the contribution efficiency of stainless steel tube,spiral stirrup and longitudinal rebar to the peak load and elastic stiffness of the specimens.The results indicate that spiral stirrup can increase the longitudinal stress of the core concrete at the peak load of the specimen.With the decrease of spiral stirrup spacing,the initial stiffness of specimens changed little,the axial bearing capacity increased,and the deformation performance after the peak improved significantly.With the increase of longitudinal rebar diameter,the axial bearing capacity increased,and there was a little influence on the deformation performance.With the increase of wall thickness for stainless steel tube,the restraint effect of stainless steel tube on concrete was enhanced,and the decrease rate of load for specimens after the peak was significantly alleviated.With the increase of axial compressive strength of concrete,the axial bearing capacity and the initial stiffness increased slightly.Spiral stirrup has the highest contribution efficiency to the axial bearing capacity,followed by stainless steel tube and longitudinal rebar.The stainless steel tube has the highest contribution efficiency to the elastic stiffness of specimens,followed by longitudinal rebar and the spiral stirrup.As the constraint coefficient increased(from 0.72 to 1.08),the size effect of marine concrete-filled stainless steel tube columns confined with spiral stirrups decreased.
作者
刘丁瑷
苏炜炜
聂田
陈宗平
LIU Dingyuan;SU Weiwei;NIE Tian;CHEN Zongping(Faculty of Green Building and Low-Carbon Technology,Guangxi Technological College of Machinery and Electricity,Nanning 530007,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)
出处
《混凝土》
北大核心
2026年第3期52-60,共9页
Concrete
基金
国家自然科学基金(51578163)
中央引导地方科技发展资金(桂科ZY21195010)
广西机电职业技术学院2024年度科研项目“不锈钢管螺旋筋海洋混凝土柱轴压性能研究”(2024YKYZ015)。
关键词
不锈钢管
螺旋筋
有限元
参数分析
贡献率
尺寸效应
stainless steel tube
spiral stirrup
finite element
parametric study
contribution efficiency
size effect
